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MIL-W-46374G

Published on: November 10, 2012
Categories: AAA HELP ME, MILITARY, PUBLICATIONS, TRAINING

TIMEFRAUD-COM-LB.jpg (20368 bytes)

INCH-POUND MIL-PRF-46374G

12
November 1999

SUPERSEDING
MIL-W-46374F

14
October 1991

PERFORMANCE
SPECIFICATION WATCH, WRIST: GENERAL PURPOSE

This
specification is approved for use by all Departments and Agencies of the Department of
Defense.

1. SCOPE

1.1
Scope. This specification covers analog wrist watches intended for general use,
that are intended to be continuously read, without any action required on the part of the
wearer, for periods in excess of 8 hours in low or no light situations.

1.2 Classification.
The watches are of the following types, classes, and colors, as specified

(see
6.2).

1.2.1 Types.
The types of wrist watches follow:

Type
I – Analog, short life (2 years), non-maintainable, antimagnetic, water-resistant

Type
II – Analog, long life (5-10 years), maintainable, antimagnetic, water-resistant, high
altitude, corrosion-resistant

Type
III – Analog, long life (5-10 years), maintainable, antimagnetic, water-resistant, high
altitude, corrosion-resistant, with elapsed time ring

1.2.2
Classes. The classes of wrist watches follow: Class 1 – Electrical movement,
battery installed

Class 2 –
Electrical movement, battery out of watch but packed with watch

Class
3 – Electrical movement, battery not included with watch

Class
4 – Mechanical movement, battery not required

Beneficial
comments (recommendations, additions, deletions) and any pertinent data which may be used
in improving this document should be addressed to: Defense Supply Center Richmond (DSCR),
ATTN: DSCR-VBD, 8000 Jefferson Davis Highway, Richmond, VA

23297-5610 by using
the Standardization Document Improvement Proposal (DD Form 1426)

appearing
at the end of this document or by letter.

AMSC N/A FSC 6645

DISTRIBUTION
STATEMENT A
. Approved for public release; distribution is unlimited.

MIL-PRF-46374G

1.2.3
Colors.

Color M – Silvery
metallic

Color
B – Black

2. APPLICABLE
DOCUMENTS

2.1
General. The documents listed in this section are specified in sections 3 and 4 of
this specification. This section does not include documents cited in other sections of
this specification or recommended for additional information or as examples. While every
effort has been made to ensure the completeness of this list, document users are cautioned
that they must meet all

specified
requirements documents cited in sections 3 and 4 of this specification, whether or not
they are listed.

2.2 Government
documents
.

2.2.1
Standard. The following standard forms a part of this document to the extent
specified herein. Unless otherwise specified, the issues of these documents are those
listed in the issue of the Department of Defense Index of Specifications and Standards
(DoDISS) and supplemented thereto, cited in the solicitation (see 6.2).

STANDARD

DEPARTMENT OF
DEFENSE

MIL-STD-810E –
Environmental Test Methods and Engineering Guidelines

(Unless otherwise
indicated, copies of the above standard are available from the

Standardization
Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA

19111-5094.)

2.3
Order of precedence. In the event of a conflict between the text of this document
and the references cited herein, the text of this document takes precedence. Nothing in
this document, however, supersedes applicable laws and regulations unless a specific
exemption has been obtained.

3. REQUIREMENTS

3.1
Qualification. The watches furnished under this specification shall be products
that are authorized by the qualifying activity for listing on the applicable qualified
products list (QPL) before contract award (see 4.3 and 6.3).

3.2
Toxic chemicals, hazardous substances, and ozone depleting substances (ODS). The
use of toxic chemicals, hazardous substances, or ODS shall be avoided, whenever feasible.

MIL-PRF-46374G

3.2.1
Toxicity. The finished product covered by this specification shall have no adverse
effect on the health of personnel when used for its intended purpose.

3.3
Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible
provided that the material meets or exceeds the operational and maintenance requirements,
and promotes economically advantageous life cycle costs.

3.4
Design. There shall be a stem set movement driving concentrically mounted hour,
minute, and second hands around a 12 hour dial. The dial background shall be black; the
numbers and graduations shall be white. Arabic numerals 1 through 12 shall be adjacent to
and inside the hour marks and arranged in a clockwise direction. Concentric with and
adjacent to the numerals 1 through 12, in a smaller font, shall be the Arabic numerals 13
through 24. The 13 shall be adjacent to the 1 o’clock; the 14 shall be adjacent to
the 2 o’clock; and continuing until the 24 is adjacent to the 12 o’clock.
Manufacturer symbols or identification shall not appear on the dial.

3.4.1.
Design approval. At the time of qualification testing, movement and case design
shall be reviewed by and subject to the approval of the government. Manufacturer drawings,
specifications, sample movements, sample cases, and supporting data, as applicable, shall
be submitted for government approval in accordance with 4.6.5.1.

3.4.2 Movement.

3.4.2.1 Class
4 (mechanical)
.

3.4.2.1.1
Mechanical power. The movement shall be powered by a stem wound and stem set
mainspring. When fully wound, the mainspring shall drive the complete movement a minimum
of

36 hours without
rewinding.

3.4.2.1.2
Jewel bearings, types II and III. The movement shall have 15 or more functional
jewel bearings located at bearing points most essential to reduce friction and wear of the
train and escapement parts.

3.4.2.2
Classes 1, 2 and 3 (electrical). Classes 1, 2 and 3 watches shall be powered by a
self- contained electrical power cell. For type I classes 2 and 3, types II and III
classes 1, 2 and 3 watches, the power cell shall be commercially available from a minimum
of two manufacturers and shall contain orientation marks which identify the positive (+)
side. Internal contacts for the power cell shall be made of, or plated with, material that
shall not corrode. The electrically powered watch shall operate a minimum of 2 1/2 years
without the necessity to change the battery.

MIL-PRF-46374G

3.4.3
Hand adjustment.

3.4.3.1
Hand setting. The minute hand shall not rotate (jump) at its tip, more than one tip
width when the crown is moved from the setting position to the “winding”
position after setting the hands.

3.4.3.2
Second hand stop mechanism. Pulling the stem, by means of the crown, to the setting
position shall result in stopping the movement. Rotation of the stem, by turning the
crown, shall permit the minute and hour hands to be advanced without any movement of the
second hand. Depressing the stem, by pushing the crown, shall result in complete operation
of the movement and hands. When the stem is pushed in, the watch shall start immediately.

3.4.4
Elapsed time ring, type III. There shall be an elapsed time ring concentric with
the axis of the watch. The elapsed time ring shall be designed to assure that the outer
edge (shoulder) of the crystal is recessed within the elapsed time ring. The background of
the elapsed time ring shall be the same shade of black as the background of the dial. The
numbers and graduations shall be the same shade of white as that on the dial. Around the
ring there shall be 12 hour marks equally spaced around the dial. Except for the number
12, all the marks shall be numerals starting with 1 and progressing clockwise to 11. The
number 12 shall be replaced by a luminous mark. Between the 12 o’clock and 1 o’clock,
1 o’clock and 2 o’clock, 2 o’clock and 3 o’clock, and the 3 o’clock
and 4 o’clock marks, there shall be four equally spaced minute marks. The periphery
of the elapsed time ring shall be made rough by checkering, knurling, serrating or any
method that shall facilitate the turning of the ring. The elapsed time ring shall move
only when a torque of 180 ± 40 mNm (26 6 inch-ounces) is applied both in the clockwise
and counterclockwise directions. The elapsed time ring shall be capable of withstanding,
without damage, two forces, each of 44.5 ± 2

N
(10 1/2 pounds), applied to the lower side of the elapsed time ring with the 12 o’clock
luminous mark at the 3 o’clock position.

3.4.5
Case bars, types II and III. A watch strap shall be attached to the watch case at
both ends by means of integral bars or removable spring bars. A static pull of 67 ± 2 N
(15 1/2 pounds) on the watch strap from each end of the case shall cause no damage.

3.4.6
Crystal strength. Crystals, that have been assembled to the case and that have been
subjected to the storage environment of table I, shall be visually inspected and tested
for strength. When visually inspected, the crystals shall be transparent, uncolored, and
free from bubbles, striae, scratches, chips or other imperfections that may interfere with
reading the watch. When functionally tested, the crystal shall show no visible damage of
cracking or chipping.

3.4.7 Strap.
The strap color shall be black.

MIL-PRF-46374G

TABLE
I. Operating environment.

Environment

Limits

Duration

Simple harmonic vibration

Amplitude
of 0.762 0.127 mm

(1.524 0.254 mm
total excursion)

Amplitude of 0.030 0.005 inch

(0.060 0.010 inches
total excursion)

Frequencies varied uniformly between

30 Hz to 60 Hz to 30 Hz

20
minutes with vibration perpendicular to dial

20 minutes with
vibration in plane of dial and in direction from 12 to 6

20 minutes with vibration in plane of
dial and in direction from 9 to 3

Shock

Drop from height of
50 cm (19.7 inches), uncontrolled, onto vinyl tile 3 mm (1/8 inch) thick affixed to
concrete block

Once

Storage

-45
C 1.1 C (-50 F 2 F)

15.5 C to 32.2 C (60 F to 90 F)

60 C 1.1 C (140 F 2 F) and

50 percent relative humidity

15.5 C to 32.2 C (60 F to 90 F)

24 hours

24 hours

24 hours

24 hours

Water resistance

Complete
immersion in distilled water with approximately 1 percent by weight wetting solution under
one atmosphere (14.7 psi) and at room temperature

Complete immersion in distilled water
with approximately 1 percent by weight wetting solution under three atmospheres (44.1 psi)
and at room temperature

5 minutes

5 minutes

Water leakage

Submerged
in a measured volume of distilled or deionized water, equal to approximately 10 times the
volume of the watch, at 23 C 1 C

(73 F 3 F)

24 hours

Magnetism, type I

14.5 to 15.5 Gauss
magnetic field, stem parallel to direction of field

10 cycles of 3 seconds
on

– 3 seconds off

Magnetism, types II and III

125
1 Gauss magnetic field, stem parallel to direction of field

10 minutes

MIL-PRF-46374G

TABLE
I. Operating environment. – Continued

Environment

Limits

Duration

Altitude, types II and III

Altitude of 10,700
meters

(35,000 feet)

60 minutes

Salt fog, types II and III

Salt fog test Method
509.3, MIL-STD-810

48 hours

Human
perspiration resistance, types II and III

Immerse watch in a saturated sodium chloride solution containing 5 percent
by volume lactic acid (65 strength) at

91
C 1 C (196 F 2 F) Air dry

Store
in atmosphere produced by a 50 percent solution of glacial acetic acid

Instantaneous

2 hours

20 hours

Readability
in total darkness

After having been
stored in total darkness for 8 hours, and without any intervention on the part of the
user, watch shall be readable in total darkness

8 hours

3.4.8
Case markings. The back of the case shall be marked with the information shown in
table II.

TABLE II. Case markings.

Item

Descriptive
title

Title and specification number

WATCH, WRIST: GENERAL
PURPOSE, MIL-PRF-46374G

National stock number

NSN

Amount of radioactive material

MILLICURIES

Nuclear
Regulatory Commission manufacturer identification number

NRC MFR ID NO.

Contract number

CONT NO.

Date

DATE

Serial number

SERIAL NO.

Manufacturer CAGE code

MFR CAGE CODE

Note:
The national stock number, contract number, and date may be applied without the
descriptive titles. The amount of radioactive material and the Nuclear Regulatory
Commission manufacturer identification number are necessary only if there is radioactive
material present. The marking of the month shall be the first three letters of the month
and the marking of the year shall be the year in full, e.g. April 2009 would be “APR
2009”. For type I class 3, types II and III class

3,
and all class 4 watches, the date (month and year) shall be date of award of contract. For
all other watches, the date (month and year) shall be date of assembly. Only type I class
3 and all class 4 watches shall be serialized. The serial numbers shall be assigned by the
contractor. Serial

MIL-PRF-46374G

numbers of rejected watches shall not be repeated. For class 3 and 4
watches, the manufacturer’s name and model or grade number shall be marked on the
movement (barrel bridge, train bridge or both).

3.4.9 Case.

3.4.9.1
Battery servicing. For type I classes 2 and 3 and types II and III classes 1, 2,
and 3 watches, the power cell shall be replaceable without damaging the watch such that it
would not be able to meet all the performance characteristics of 3.5.

3.4.9.2
Finish and color. All visible exterior surfaces of the case assembly, excluding
control switches and spring type case bars, shall have a dull non-specular/non-reflective
finish. The color shall be silvery metallic or black as specified in the acquisition
requirements (see 6.2).

3.5 Performance
characteristics
.

3.5.1
Vibration. While running, the watch shall not be damaged after being subjected to
the vibration environment of table I.

3.5.2
Shock. While running, the watch shall not be damaged after being subjected to the
shock environment of table I.

3.5.3
Storage. For class 1 watches, while running, the watch shall not be damaged after
being subjected to the storage environment of table I. For class 2 watches, both the watch
and its battery (battery not installed) shall be simultaneously subjected to the storage
environment of table I. For class 2 watches, at the conclusion of the storage test, the
battery shall be installed in the watch and the watch shall run without any evidence of
damage. For class 3 watches, the watch shall not be damaged after being subjected to the
storage environment of table I. Class 4 watches shall not be run during test.

3.5.4
Water resistance. The watch shall show no evidence of leakage after being subjected
to the water resistance environment of table I.

3.5.5
Water leakage. While running, the watch shall not be damaged after being subjected
to the water leakage environment of table I. After the watches are removed from the water,
if there is any water in the crystal bowl at the completion of the test, it shall
constitute a failure of the water resistance test. (This test may be done concurrently
with the radiological diffusion test in 3.6.3.)

3.5.6
Synchronization. The hour hand shall indicate the correct time within 1 dial
graduation when the minute hand is at 12. To determine compliance, the setting mechanism
shall be

activated and
readings taken when the minute hand is at 12 and the hour hand is at the 3, 6, 9 and

12
hour positions respectively.

3.5.7
Magnetism. While running, the watch shall not be damaged after being subjected to
the magnetic environment of table I.

MIL-PRF-46374G

3.5.8
Dark viewing. After being subjected to the readability in total darkness
environment of table I, and without any intervention on the part of the observer, the
luminous features of the watch shall be of sufficient brightness so as to be readable in
total darkness while holding the watch no closer than 30.5 cm (12 inches) from the eyes of
a dark-adapted observer having normal or corrected 20/20 vision.

3.5.9
Isochronism. Watches shall pass the test for isochronism specified in 4.6.5.16, in
a dial-up position at 23.9 C 1 C (75 F 3 F).

3.5.9.1
Type I class 4. The watch shall be fully wound and operated for 4 hours. The watch
shall again be fully wound. The rate shall be recorded while fully wound and then at the
end of the 4th, 20th and 24th hours. The difference in uniformity of rates between 4-hour
periods shall not exceed 10 seconds.

3.5.9.2
Types II and III class 4. The variation in rate shall be recorded every 6 hours for
a period of 24 hours and shall not exceed 5 seconds from the rate recorded in the previous
6 hour period. The watches shall be fully wound prior to testing and shall not be wound
during the test.

3.5.10
Accuracy. After being subjected to all of the environments of table I, the mean
daily rates of the watch in each of the two positions of (1) dial-up and (2) crown-down
shall not exceed the values at the temperatures specified in table III.

TABLE III. Accuracy.

Temperature

Type
I, Class 4

Types
II and III, Class 4

Types I, II and III,
Classes 1, 2, and 3

Mean daily rate

(Seconds
per day)

Mean daily rate

(Seconds
per day)

Mean daily rate

(Seconds
per day)

4.4 C 1.1 C
(40 F 2 F)

120

60

3

23.9 C 1.1
C (75 F 2 F)

60

30

0.7

51.7 C 1.1
C (125 F 2 F)

120

60

3

3.5.11
Long term accuracy (Qualification only). Accuracy shall be determined during a 90
day period as specified in 4.6.5.24. During the 90 day period of operation, watches shall
be subjected to vibration and shock after 30 days and 60 days of operation in accordance
with 3.5.1 and 3.5.2, except that duration of vibration shall be for only 5 minutes in
each direction. Watches shall meet the criteria of table IV.

3.5.12
Altitude. Types II and III watches shall show no evidence of damage or adverse
effect on operation when subjected to the altitude environment of table I.

3.5.13
Salt fog. Types II and III watches shall show no evidence of damage to the crystal,
the case, or the watch band or adverse effect upon operation after having been subjected
to salt atmosphere in accordance with the salt fog environment of table I.

MIL-PRF-46374G

TABLE
IV. Long term accuracy.

Type

Average mean daily rate

(Seconds per day)

Mean daily rate

(Seconds per day)

Type I, class 4

72

120

Types II and III, class 4

36

60

Types I,
II and III, classes 1, 2, and 3

2.4

4

3.5.14
Human perspiration resistance. Types II and III watches and their watch bands shall
show no evidence of corrosion, discoloration, or staining after having been subjected to
an accelerated lactic acid test in accordance with the human perspiration environment of
table I.

3.6
Radiological performance. (NOTE: Section 3.6 is applicable only if nuclear material
is present.)

3.6.1
Contamination. Completed watches shall be tested for contamination after having
been subjected to all the environments of table I. They shall be wiped with a Metricel
GN-6 or equivalent wipe, moistened with deionized or distilled water. Within 1 minute of
wiping, the wipe shall be placed in a scintillation counter. Each resulting wipe shall
indicate a removable contamination level of not more than 100 disintegrations per minute
(dpm).

3.6.2
Long term contamination (Qualification only). Completed watches shall be packaged
in accordance with 5.1 for a period of not less than 90 days. They shall then be wiped
with a Metricel GN-6 or equivalent wipe moistened with deionized or distilled water.
Within 1 minute of wiping, the wipe shall be placed in a scintillation counter and the
disintegrations measured. Each resulting wipe shall indicate a removable contamination
level of not more than 100 dpm.

3.6.3
Diffusion. Completed watches shall be submerged in a measured volume of distilled
or deionized water, equal to approximately 10 times the volume of the watch, for 24 hours
at

23
C 1 C (73 F 3 F). The watches shall then be removed from the water and the water measured
for radioactive content. The diffusion of contamination into the water shall not exceed

50 nanocuries per 24
hour period (see 3.5.5).

3.7 Workmanship. All parts shall be furnished so the case and crown
shall have no sharp edges or corners which could cause skin cuts or abrasions. All lugs
from the tip of the lug to the body of the bezel shall have corners rounded to avoid skin
abrasion. Rounded edges and corners shall be uniform in appearance.

3.8
Operating instructions. An operating instruction shall be furnished with each
watch. This instruction shall describe all the functions of the watch, the durability
(i.e., shock and water resistance features), life expectancy, and accuracy that can be
expected from the watch, type battery and any precautions that should be observed during
the life of the watch.

MIL-PRF-46374G

4.
VERIFICATION

4.1
Classification of inspections. The inspection requirements specified herein are
classified as qualification inspection (see 4.3) and conformance inspection (see 4.4).

4.2 Inspection
conditions
. Unless otherwise specified, all inspections shall be performed at

15.6
C (60 F) to 32.2 C (90 F), at barometric pressure of 710 mm (28 inches) to 790 mm

(31
inches) of mercury and maximum relative humidity of 80 percent.

4.3
Qualification inspection. Qualification inspection shall be performed on five
complete assemblies when a qualification sample is required (see 3.1). This inspection
shall include the examination of 4.5, in accordance with tables V through IX, and the
tests of 4.6. (The table IX tests, however, are exclusive to Qualification testing.)

4.3.1
Qualification sample. A quantity of 20 watches shall be submitted for qualification
testing (see 6.3). Testing shall be performed at a laboratory facility acceptable to the
government. Sample watches submitted for testing shall be derived from normal production
and be indicative of normal production equipment and procedures. Ten of the watches shall
be packed in accordance with the level of packing specified in the purchase order or
contract. The 20 watch samples shall be identified by an attached tag containing the
following information:

a. Sample for
qualification tests

b.
Submitted by (name) (date) for qualification tests in accordance with requirements of

MIL-PRF-46374G under authorization of (reference letter authorizing test)

c.
Manufacturer’s model or part number d. Name of manufacturer

4.4
Conformance inspection. Conformance inspection shall be performed in accordance
with inspection provisions set forth herein. The characteristics shown in tables V, VI,
VII and VIII shall constitute minimum inspections to be performed by the supplier prior to
government acceptance or rejection by item or lot.

4.5 Examination.

4.5.1
Conformance inspection, mechanical. Inspection shall be in accordance with table V.

TABLE V. Conformance
inspection, mechanical
.

Characteristic

Requirement

Test

Crystal strength

3.4.6

4.6.1.1

Strap

3.4.7

4.6.2

Battery servicing

3.4.9.1

4.6.3.1

Finish and color

3.4.9.2

4.6.3.2

MIL-PRF-46374G

4.5.2
Conformance inspection, radiological. Inspection, if applicable, shall be in
accordance with table VI.

TABLE VI. Conformance
inspection, radiological
.

Characteristic

Requirement

Test

Contamination

3.6.1

4.6.4.1

Diffusion

3.6.3

4.6.4.2

4.5.3
Conformance inspection, materials and design. Inspection shall be in accordance
with table

VII.

TABLE VII. Conformance inspection, materials and design.

Characteristic

Requirement

Test

Type I

Types II and III

Classes

1, 2, 3

Class 4

Classes

1, 2, 3

Class 4

Design

3.4

3.4

3.4

3.4

4.6.5

Design approval

3.4.1

3.4.1

3.4.1

3.4.1

4.6.5.1

Mechanical power

3.4.2.1.1

3.4.2.1.1

4.6.5.2

Jewel bearings

3.4.2.12

4.6.5.3

Electrical power

3.4.2.2

3.4.2.2

4.6.5.4

Hand adjustment

3.4.3

3.4.3

3.4.3

3.4.3

4.6.5.5

Hand setting

3.4.3.1

3.4.3.1

3.4.3.1

3.4.3.1

4.6.5.5.1

Second
hand stop mechanism

3.4.3.2

3.4.3.2

3.4.3.2

3.4.3.2

4.6.5.5.2

Elapsed
time ring

(Type III only)

3.4.4

3.4.4

4.6.5.6

Case bars

3.4.5

3.4.5

4.6.5.7

Case markings

3.4.8

3.4.8

3.4.8

3.4.8

4.6.5.8

MIL-PRF-46374G

4.5.4
Conformance inspection, performance. Inspection shall be in accordance with table
VIII.

TABLE VIII. Conformance
inspection, performance
.

Characteristic

Requirement

Test

Type I

Types II and III

Classes

1, 2, 3

Class 4

Classes

1, 2, 3

Class 4

Vibration

3.5.1

3.5.1

3.5.1

3.5.1

4.6.5.9

Shock

3.5.2

3.5.2

3.5.2

3.5.2

4.6.5.10

Storage

3.5.3

3.5.3

3.5.3

3.5.3

4.6.5.11

Water resistance

3.5.4

3.5.4

3.5.4

3.5.4

4.6.5.12

Water leakage

3.5.5

3.5.5

3.5.5

3.5.5

4.6.4.2

Synchronization

3.5.6

3.5.6

3.5.6

3.5.6

4.6.5.13

Magnetism

3.5.7

3.5.7

4.6.5.14.1

Magnetism

3.5.7

3.5.7

4.6.5.14.2

Dark viewing

3.5.8

3.5.8

3.5.8

3.5.8

4.6.5.15

Isochronism

3.5.9.1

4.6.5.16.1

Isochronism

3.5.9.2

4.6.5.16.2

Accuracy

3.5.10

3.5.10

3.5.10

3.5.10

4.6.5.17

Altitude

3.5.12

3.5.12

4.6.5.18

Salt fog

3.5.13

3.5.13

4.6.5.19

Human
perspiration resistance

3.5.14

3.5.14

4.6.5.20

Workmanship

3.7

3.7

3.7

3.7

4.6.5.21

Operating instructions

3.8

3.8

3.8

3.8

4.6.5.22

4.5.5
Qualification inspection. Inspection shall be in accordance with table IX.

TABLE
IX. Qualification inspection.

Characteristic

Requirement – Types I, II and III

Test

Long term contamination

3.6.2

4.6.5.23

Long term accuracy

3.5.11

4.6.5.24

4.5.6
Noncompliance. If a sample fails to pass table VI inspection, the contractor shall
immediately notify the cognizant Contracting Activity of such failure and take corrective
action on the materials or processes, or both, and on all units produced which can be
corrected and which

are
considered subject to the same failure. Acceptance and shipment of the product shall be
discontinued until corrective action, acceptable to the Contracting Activity, has been
taken. After the corrective action has been taken, table VIII inspections may be
reinstituted; however, final acceptance and shipment shall be withheld until the table VI
inspection has shown that the corrective action was successful. In the event of failure
after reinspection, information concerning the failure shall be furnished to the cognizant
inspection and qualifying activities.

MIL-PRF-46374G

4.6
Test methods.

4.6.1
Crystals. Crystals shall be examined after assembly to the case and after being
subjected to the storage environment of table I to determine compliance with 3.4.6.

4.6.1.1
Crystal strength test. The crystals shall be functionally tested as follows: The
case assembly, including crystal, shall be placed flat, crystal up, on a rubber sheet 0.5
mm (0.02 inch) thick, placed on a horizontal, rigid nonresilient, metal surface. A solid
steel sphere weighing 15.7

1.4
grams (0.55 0.05 ounces) and 1.6 cm (five-eighths of an inch) in diameter shall then be
freely dropped so as to fall 30.5 cm (12 inches) before striking the crystal. Any visible
damage to the crystal shall be cause for rejection.

4.6.2 Strap.
The strap shall be examined for compliance with 3.4.7.

4.6.3
Case.

4.6.3.1 Battery
servicing
. The case shall be visually inspected to determine the conformance to

3.4.9.1.
A physical test shall be applied where case parts are not capable of being removed to
determine conformance to 3.4.9.1. The physical test shall consist of applying a force or
prying under normal pressure (equivalent to 40.5 4.5 N (9 1 pounds) direct force) in such
a manner that no marking or scarring of the case and case finish shall result.

4.6.3.2 Finish
and color
. The case shall be visually inspected to determine the conformance to

3.4.9.2.

4.6.4 Radiological.

4.6.4.1
Contamination. Completed watches shall be checked for contamination in accordance
with 3.6.1. A Metricel GN-6 or equivalent wipe, moistened with deionized or distilled
water, shall be used to wipe the watches. All exterior surfaces of the completed watch
shall be thoroughly wiped. The wipe shall be placed in the liquid scintillation solution
within

1
minute after wiping each watch. The amount of radiological contamination on the wipe shall
be determined using a liquid scintillation counting technique. Results indicating
removable contamination over the entire watch of more than 100 dpm shall constitute
failure of this test.

4.6.4.2
Diffusion and water leakage. Completed watches shall be checked for diffusion in
accordance with 3.6.3 and water leakage in accordance with 3.5.5. They shall be submerged
in a measured volume of distilled or deionized water, equal to approximately 10 times the
volume of the watch, for 24 hours at 23 C 1 C (73 F 3 F). Watches shall be removed from
the water. This is the test procedure for radiological diffusion, and if the radioactive
content of the water exceeds 50 nanocuries per 24 hour period, it shall constitute failure
of the test. The watches shall also be examined for water leakage, and if there is water
in the crystal bowl at the completion of the test, it shall constitute failure of the
water resistance test. Failure of watches in either of these tests shall be cause for
refusal by the government to continue acceptance of the

MIL-PRF-46374G

production
watches until evidence has been provided by the contractor that corrective action has been
taken to eliminate the deficiencies.

4.6.5 Design.
The watch shall be visually examined for conformance to 3.4.

4.6.5.1
Design approval. Manufacturing data on movement and case design shall be forwarded
to the government activity identified in 6.3 (see 3.4.1).

4.6.5.2
Mechanical power. Movement identity, design and construction (stem mount and stem
set) shall be determined prior to qualification testing for compliance with 3.4.2.1.1.
With the watch fully wound, it shall be examined for continuous running, without
rewinding, for the minimum time specified in 3.4.2.1.1.

4.6.5.3
Jewel bearings. One percent of the watches under contract, but not less than three
watches, shall be examined to ensure the watches contain the appropriate number of jewels
placed at the most critical friction points, and are in compliance with 3.4.2.1.2.

4.6.5.4
Electrical power. Movement identity, design, construction, availability and marking
of the power cell shall be determined prior to qualification testing for compliance with
3.4.2.2. The watch shall be tested to ensure that the current drain allows an operating
life as specified in

3.4.2.2.
The watch shall be measured with a current meter to determine the timekeeping current
drain. To allow sufficient latitude in available power, the capacity of the power cell as
measured

in
milliampere-hours (ma hours) shall be derated by 20 percent to obtain the net power
capacity of the power cell. The comparison of power drain from the watch to the power
capacity of the derated power cell shall be made to ensure that a minimum life of 30
months can be obtained from the power cell. The internal contacts for the cell shall be
inspected for conformance with 3.4.2.2.

4.6.5.5
Hand adjustment. A standard type pull gauge with appropriate adapter shall be used
to apply the pull specified in 3.4.3. The crown shall not be damaged or separated from the
movement when the pull is applied.

4.6.5.5.1 Hand
setting
. To ensure compliance with the hour and minute “hand” setting of

3.4.3.1,
six settings shall be made in 2-hour increments.

4.6.5.5.2
Second hand stop mechanism. To ensure compliance with the second hand stop
mechanism of 3.4.3.2, the second hand setting mechanism shall be activated for at least
five different settings, to ensure that a precise stop and start action can be obtained
without adverse effect on the hands or movement.

4.6.5.6 Elapsed
time ring, type III
. The elapsed time ring shall be examined for conformance to

3.4.4.
The elapsed time ring shall move only when subjected to a torque applied clockwise and
counterclockwise of 180 ± 40.0 mNm (26 6 inch-ounces). With the index at the 3 o’clock
position of the dial, a force of 44.5 ± 2 N (10 1/2 pounds) shall be applied to the lower
side of the elapsed time ring without the ring being damaged or separated from the case.

MIL-PRF-46374G

4.6.5.7
Case bars, types II and III. Type II and III case bars shall be checked for
conformance to

3.4.5.
With the watch held in a secured position and the strap held in a position that shall not
exert pressure on the buckle or the keeper of the strap, a pulling force of 67 ± 2 N (15
1/2 pounds) shall be applied to each case/spring bar via the strap without the case/spring
bar permanently bending, loosening or causing damage to the case/spring bar or case
assembly.

4.6.5.8
Case markings. All numbers and lettering shall be visually inspected for
correctness, legibility, and application in accordance with 3.4.8. Inspection for
permanent marking shall ensure that acceptable processes have been applied, such as:
Casting, molding, steel stamp, acid, etching, or engraving.

4.6.5.9 Vibration.
The watch shall be vibrated in accordance with 3.5.1.

4.6.5.10
Shock. In compliance with 3.5.2, while running, the watch shall be dropped from a
height of 50 cm (19.7 inches), uncontrolled, onto vinyl tile 3 mm (one-eighth of an inch)
thick affixed to concrete block. At the conclusion of this test, the watch shall be
running and be subjected to a visual and tactile examination in compliance with 3.4.6 for
any crystal damage or loose, missing or damaged parts. After passing this examination, the
watch shall be subjected to the test in 4.6.5.11.

4.6.5.11
Storage. In compliance with 3.5.3, the watch shall be subjected to storage
temperatures for the times and in the order shown in table I. (Unless otherwise specified,
the humidity is the ambient humidity.) Temperature changes in the watch may be gradual to
avoid thermal shock.

All
watches shall have the battery in the watch. There shall be no evidence of physical
defects, damage on the watch, or imperfections of crystal. After passing this test, the
watch shall be subjected to and meet the requirements of 3.5.10. NOTE: The mechanical
watches shall not be run during storage tests.

4.6.5.12
Water resistance. The watch shall be examined to determine conformance with 3.5.4.
The watch shall be tested by immersing it completely for at least 5 minutes in distilled
water containing a wetting agent of approximately 1 percent by weight at room temperature
and atmospheric pressure of 1 atmosphere (14.7 pounds per square inch) for 5 minutes. For
an additional 5 minutes, the watch shall be immersed under a pressure of 3 atmospheres

(44.1
pounds per square inch). The watch interior shall then be inspected for moisture by
placing it on a heating element at 40.6 C 1 C (105 F 2 F) for 5 minutes, then placing
several drops of 21 C 1 C (70 F 2 F) water on the center of the crystal. Any visible
condensed water (fogging) on the inside of the crystal constitutes failure of this test.

4.6.5.13 Synchronization. The watch shall be examined to determine
conformance with 3.5.6. The setting mechanism shall be activated and readings taken when
the minute hand is at 12 and the hour hand is at the 3, 6, 9 and 12 hour respectively, to
determine compliance with 3.5.6.

4.6.5.14
Magnetism. A magnetic field shall be generated electrically using standard test
equipment capable of developing the magnetic intensity (in Gauss) within the limits
specified in

3.5.7. With the
watch running, it shall be placed into the energized field in the manner specified in

MIL-PRF-46374G

4.6.5.14.1
or 4.6.5.14.2 as applicable, with the stem parallel to the direction of the field. Upon
completion and removal from the field, the watch shall be rated by a precision type rate
recorder to determine compliance with 3.5.7.

4.6.5.14.1
Magnetism – type I. Watches shall be subjected to the field specified in 3.5.7,
with the field on for 3 seconds and off for 3 seconds. This cycle shall be repeated 10
times.

4.6.5.14.2
Magnetism – types II and III. Watches shall be subjected to the field specified in
3.5.7, for 10 minutes.

4.6.5.15
Dark viewing. A dark room shall be used to represent total darkness when conducting
the visual examination under the conditions and distance specified in 3.5.8 to determine
compliance therewith. Watches shall be in the dark room for at least 8 hours prior to
conducting examinations. Individual(s) performing the test shall be acclimated to the dark
room for a minimum of 20 minutes prior to conducting the test. There shall be no
intervention required, for example, by pushing a button, on the part of the individual in
order to read the watch. This test shall be performed no sooner than 60 days after
assembly of watches.

4.6.5.16
Isochronism (class 4 only). This test shall be conducted concurrently with 4.6.5.17
(see 3.5.9).

4.6.5.16.1
Type I. In the position and at the temperature specified in 3.5.9, the watch shall
be fully wound and operated for 4 hours. The watch shall again be fully wound and the rate
recorded while fully wound and after 4 hours of operation. The rates shall again be
recorded at the 20th and 24th hour. The difference in uniformity of rate between the
4-hour periods shall not exceed 10 seconds.

4.6.5.16.2 Types
II and III
. This test shall vary from 4.6.5.17 in that the error shall be

determined
at 6-hour intervals. The difference of error recorded between each 6-hour period shall not
exceed 5 seconds.

4.6.5.17
Accuracy. During the conditioning period, the running watches shall be subjected to
the test temperatures of table III for at least 4 hours prior to the test. Daily rates
shall be recorded for a period of 3 days in each position and the mean daily rate
determined therefrom. The watches shall be rejected if the mean daily rate exceeds the
requirements of 3.5.10. The mechanical type watches shall be wound at the beginning of
each test and each 24 hours thereafter for the duration of the tests (see 4.6.5.16).

4.6.5.18
Altitude – types II and III. Watches shall be subjected to the operating
environment specified in 3.5.12.

4.6.5.19 Salt fog – types II and III. Watches shall be subjected to
the operating environment specified in 3.5.13. Upon completion of exposure to salt fog,
the watches shall be rinsed and allowed to dry for 48 hours prior to examination.

MIL-PRF-46374G

4.6.5.20
Human perspiration resistance types II and III. Watches shall be subjected to the
operating environment specified in 3.5.14.

4.6.5.21
Workmanship. Watches shall be inspected by visual and tactile means to ensure that
watches are continually produced in accordance with 3.7.

4.6.5.22 Operating
instructions
. The operating instructions shall be examined for conformance to

3.8.

4.6.5.23
Long term contamination (Qualification only). Ten watches, packaged in accordance
with 6.2 and held in storage for a period of not less than 90 days, shall be subjected to
the test in

4.6.4.1 and shall
pass the requirements in 3.6.2.

4.6.5.24
Long term accuracy (Qualification only). This test shall only be conducted on
watches submitted in conformance with 4.3 to determine compliance with 3.5.11. Each watch
shall have met all other conformance requirements and tests herein prior to being
subjected to the long term accuracy test. The test shall be conducted at 24.0 C 1.7 C (75
F 3 F) for a total running time of 90 days, half of which time shall have been in a
dial-up and half in a crown-down position, alternated at 7-day intervals. In consideration
of the normal work week of testing personnel, testing need not be continuous. The mean
daily rate for any “individual” watch shall meet the accuracy specified in
3.5.11.

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements
shall be as specified in the contract or order (see 6.2). When actual packaging of
material is to be performed by DoD personnel, those personnel need to contact the
responsible packaging activity to ascertain requisite packaging requirements. Packaging
requirements are maintained by the Inventory Control Point’s packaging activity
within the Military Department or Defense Agency, or within the Military Department’s
System Command. Packaging data retrieval is available from the managing Military
Department’s or Defense Agency’s automated packaging files, CD-ROM products, or
by contacting the responsible packaging activity.

6. NOTES

6.1
Intended use. Three types of watches are covered by this specification. Types I and
II are general purpose watches intended for use in low or no light situations. Type III
watch is intended for use by bomber pilots and navigators in low or no light situations on
prolonged flights. The intended use, available maintenance and storage of the watch will
determine which type of watch

is required.

6.1.1
Military unique. The watch covered by this specification is military unique. It has
the unique military requirement of being able to be read after 8 hours in total darkness
without any intervention on the part of the user, for example, by the push of a button. No
commercial equivalent exists.

MIL-PRF-46374G

6.1.2
Type selection criteria. The following criteria is a guide for watch type selection
to match user requirements:

Type I: Analog,
short life (2 years), non-maintainable, antimagnetic, water-resistant

Type
II: Analog, long life (5-10 years), maintainable, antimagnetic, water-resistant, high
altitude, corrosion-resistant

Type
III: Analog, long life (5-10 years), maintainable, antimagnetic, water-resistant, high
altitude, corrosion-resistant, with elapsed time ring

6.2 Acquisition
requirements
. Acquisition documents should specify the following:

a.
Title, number, and date of this specification

b.
Type, class, and color of watch required (see 1.2)

c.
Unit and quantity required

d.
Issue of DoDISS to be cited in the solicitation, and if required, the specific issue of
individual documents referenced (see 2.2)

e. Case finish and
color (see 3.4.9.2)

f.
Packaging requirements (see 5.1)

6.3
Qualification. With respect to products requiring qualification, awards will be
made only for such products which, at the time of award of contract, have been tested and
approved for inclusion on the applicable qualified products list whether or not such
products have actually been so listed by that date. The attention of the suppliers is
called to this requirement, and manufacturers are urged to arrange to have the products
that they propose to offer to the Federal Government tested for qualification in order
that they may be eligible to be awarded contracts or orders for the products covered by
this specification. The activity responsible for the qualified products list is the U.S.
Army Armament Research, Development and Engineering Center, Attn: AMSTA-AR-QAW (B-12),
Picatinny Arsenal, New Jersey 07806-5000. Information pertaining to qualification of
products may be obtained from that activity (see 3.1, 4.3.1, and 4.6.5.1).

6.4 Definitions.

a.
Accuracy error notation. Where algebraic signs are used to denote the direction of
timekeeping accuracy error, the plus (+) sign represents “fast” and the minus
(-) sign “slow”.

b.
Daily rate. Rate in a 24 hour period. The term “daily rate” is used
synonymously with the terms “daily error” and “daily accuracy”.

c. Mean daily rate. The arithmetic average of individual daily
rates (daily errors) with proper regard to algebraic signs in the summation. Unless
otherwise specified, the mean daily rate will be based on 3 consecutive days operation.

d.
Error. Algebraic time difference in seconds between the watch being tested and the
master timepiece.

MIL-PRF-46374G

6.5
Cross-reference of classification. Table X is a cross-reference of classification
changes from

MIL-W-46374F
to this specification.

TABLE X. Cross-reference table.

MIL-W-46374F

MIL-PRF-46374G

Type 1

Type II class 4

Type 2

Type I class 4

Type 3

Type I class 1

Type 4

Type I class 2

Type 5

Type I class 3

Type 6

Type III class 1

Type 6

Type III class 2

Type 6

Type III class 3

6.6
Part identification number (PIN). The following part identification numbering
procedure is for government purposes and does not constitute a requirement for the
contractor. This

example describes a
part numbering system for specification MIL-PRF-46374G.

MIL-PRF-46374G
X X XXX

Type
I – Analog, short life (2 years), non-maintainable, antimagnetic, water-resistant

II
– Analog, long life (5-10 years), maintainable, antimagnetic, water-resistant, high
altitude, corrosion-resistant

III
– Analog, long life (5-10 years), maintainable, antimagnetic, water-resistant, high
altitude, corrosion-resistant, with elapsed time ring

Class 1 – Electrical
movement, battery installed

2
– Electrical movement, battery out of watch but packed with watch

3
– Electrical movement, battery not included with watch

4 – Mechanical
movement, battery not required

Color M – Silvery
metallic

B – Black

Specification number

MIL-PRF-46374G

6.7
Subject term (key word) listing.

Analog
Antimagnetic Water-resistant Quartz

6.8
Changes from previous issue. Marginal notations are not used in this revision to
identify changes with respect to the previous issue due to the extent of the changes.

Custodians:
Preparing activity:

 

Air
Force – 82

Army
– AR Navy – SH

DLA – GS

(Project
6645-0446)

 

Reviewer:
Navy – MC

STANDARDIZATION DOCUMENT IMPROVEMENT PROPOSAL

INSTRUCTIONS

1. The preparing activity must
complete blocks 1, 2, 3, and 8. In block 1, both the document number and revision letter
should be given.

2. The submitter of this form must complete blocks 4, 5, 6, and
7, and send to preparing activity.

3. The preparing activity must provide a reply within 30 days
from receipt of the form.

NOTE: This form may not be used
to request copies of documents, nor to request waivers, or clarification of requirements
on current contracts. Comments submitted on this form do not constitute or imply
authorization to waive any portion of the referenced document(s) or to amend contractual
requirements.

I
RECOMMEND A CHANGE:

1. DOCUMENT NUMBER

MIL-PRF-46374G

2. DOCUMENT DATE
(YYYYMMDD)

19991112

3. DOCUMENT TITLE WATCH, WRIST: GENERAL PURPOSE

4. NATURE OF CHANGE (Identify paragraph number and
include proposed rewrite, if possible. Attach extra sheets as needed.)

5. REASON FOR RECOMMENDATION

6. SUBMITTER

a. NAME (Last, First, Middle Initial)

b. ORGANIZATION

c. ADDRESS (Include Zip Code)

d. TELEPHONE (Include Area Code)
(1) Commercial

(2) AUTOVON

(if applicable)

7.DATE SUBMITTED

(YYYYMMDD)

8. PREPARING ACTIVITY

a. NAME DEFENSE SUPPLY CENTER
RICHMOND

b. TELEPHONE Include Area
Code)

(1) Commercial (804) 279-3875 (2) AUTOVON 695-3875

c. ADDRESS (Include Zip Code)

DEFENSE SUPPLY CENTER RICHMOND,
ATTN: DSCR-VBD, 8000

JEFFERSON DAVIS HIGHWAY, RICHMOND, VA 23297-5610

IF YOU DO
NOT RECEIVE A REPLY WITHIN 45 DAYS, CONTACT:

Defense Standardization Program
Office (DLSC-LM)

8725 John J. Kingman road, Suite
2533, Ft. Belvoir, VA 22060-2533

Telephone (703) 767-6888 AUTOVON 427-6888

DD Form 1426, FEB 1999 (EG) PREVIOUS
EDITION IS OBSOLETE WHS/DIOR, Feb 99

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