U.S. Department of Defense MIL-PRF-46374G User Manual
MIL-PRF-46374G
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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.
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.
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.
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.
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.
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.
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.
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.