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MIL-PRF-46374G

Categories: US MILITARY WATCHES

MIL-PRF-46374G

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 Hz20 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 3ShockDrop from height of 50 cm (19.7 inches), uncontrolled, onto vinyl tile 3 mm (1/8 inch) thick affixed to concrete blockOnceStorage-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 hoursWater resistanceComplete 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 temperature5 minutes

5 minutesWater leakageSubmerged 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 hoursMagnetism, type I14.5 to 15.5 Gauss magnetic field, stem parallel to direction of field10 cycles of 3 seconds on

– 3 seconds offMagnetism, types II and III125 1 Gauss magnetic field, stem parallel to direction of field10 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 minutesSalt fog, types II and IIISalt fog test Method 509.3, MIL-STD-81048 hoursHuman 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 hoursReadability in total darknessAfter 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 darkness8 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, 3Class 4Classes

1, 2, 3Class 4 Design

3.4

3.4

3.4

3.4

4.6.5

Design approval3.4.13.4.13.4.13.4.14.6.5.1Mechanical power

3.4.2.1.1

3.4.2.1.14.6.5.2Jewel bearings

3.4.2.124.6.5.3Electrical power3.4.2.2

3.4.2.2

4.6.5.4Hand adjustment3.4.33.4.33.4.33.4.34.6.5.5Hand setting3.4.3.13.4.3.13.4.3.13.4.3.14.6.5.5.1Second hand stop mechanism3.4.3.23.4.3.23.4.3.23.4.3.24.6.5.5.2Elapsed time ring

 

(Type III only)

3.4.43.4.44.6.5.6Case bars

3.4.53.4.54.6.5.7Case markings3.4.83.4.83.4.83.4.84.6.5.8

 

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, 3Class 4Classes

1, 2, 3Class 4 Vibration3.5.13.5.13.5.13.5.14.6.5.9Shock3.5.23.5.23.5.23.5.24.6.5.10Storage3.5.33.5.33.5.33.5.34.6.5.11Water resistance3.5.4

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