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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.
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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 requiremen
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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.
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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 movemen
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MIL-PRF-46374G TABLE I. Operating environment. Environment Limits Duration Simple harmonic vibration 20 minutes with vibration Amplitude of 0.762 ± 0.127 mm perpendicular to dial (1.524 ± 0.254 mm total excursion) 20 minutes with vibration Amplitude of 0.030 ± 0.005 inch in plane of dial and in (0.060 ± 0.010 inches total excursion) direction from 12 to 6 Frequencies varied uniformly between 20 minutes with vibration 30 Hz to 60 Hz to 30 Hz in plane of dial and in direction from 9 to 3 Shock Dr
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MIL-PRF-46374G TABLE I. Operating environment. - Continued Environment Limits Duration Altitude, types II and III Altitude of 10,700 meters 60 minutes (35,000 feet) Salt fog, types II and III Salt fog test Method 509.3, 48 hours MIL-STD-810 Human perspiration Immerse watch in a saturated sodium Instantaneous resistance, types II and III chloride solution containing 5 percent by volume lactic acid (65 strength) at 91 ° C ± 1 ° C (196 ° F ± 2 ° F) 2 hours Air dry Store in atmosphere produced by a
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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
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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 specifie
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MIL-PRF-46374G TABLE IV. Long term accuracy. Average mean Mean daily Type daily rate rate (Seconds per day) (Seconds per day) Type I, class 4 72 120 Types II and III, class 4 36 60 Types I, II and III, 2.4 4 classes 1, 2, and 3 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
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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. Quali
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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. Requirement Characteristic Type I Types II and III Test Classes Class 4 Classes
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MIL-PRF-46374G 4.5.4 Conformance inspection, performance. Inspection shall be in accordance with table VIII. TABLE VIII. Conformance inspection, performance. Requirement Characteristic Type I Types II and III Test Classes Class 4 Classes Class 4 1, 2, 3 1, 2, 3 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
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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
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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 p
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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 C
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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 sub
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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 w
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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 Acquisi
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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 gov
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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 DLA - GS Army - AR Navy - SH (Project 6645-0446) Reviewer: Navy - MC 20
