MIL-DTL-10215M
3. REQUIREMENTS
3.1 Qualification. Components furnished under this specification shall be products
authorized by the qualifying activity for listing on the applicable qualified products list (QPL)
described. Dials shall be fabricated from metal or metal alloys, and case windows shall be
fabricated from clear plastic conforming to MIL-W-80 or, if molded, conforming to type I, class
3 of L-P-380 or group 1, class 1 of ASTM D3935. For all other components, unless specified
herein, materials shall be in accordance with the manufacturer's standard practice.
3.2.1 Recycled, recovered or environmentally preferable materials. Recycled, recovered or
environmentally preferable materials should be used to the maximum extent possible provided the
material meets or exceeds the operational and maintenance requirements and promotes economically
advantageous life cycle costs.
3.3 Design and construction. The design and construction of the instruments and
components shall be in accordance with the interface and envelope dimensions in figure 1 through
figure 9; however, the figures are not intended to limit the manufacturer's design.
3.3.1 Speedometer and tachometer. The instruments shall be provided with a bezel, a
means for mounting and a connector for attachment of a flexible drive shaft assembly. A case
window shall be provided to facilitate illumination of the dial from an outside source, and a
means shall be provided to dehumidify trapped air after the speedometer or tachometer is sealed.
The dehumidification component shall be secured so it will not become loose when the
speedometer or tachometer is subjected to vibration.
3.3.1.2 Dial.
3.3.1.2.1 Marking. The face of the dial shall include the markings specified in figure 8,
table I. The dial face shall have a black background with white numerals, letters, and
graduations conforming to color number 37875 of FED-STD-595.
TABLE I. Dial face marking.
Height
Height
Marking
(inches)
(mm)
Numerals for mph scale
7/32
5.6
Graduations, major, mph scale
7/32
5.6
Graduations, minor, mph scale
1/8
3.2
"Miles per hour" or "MPH"
1/8
3.2
"Revolutions per minute" or "RPM"
1/8
3.2
"Hours" and "10th" or "100th"
3/32
2.4
"Miles" and "10th"
3/32
2.4
MS or military part number
3/32
2.4
Manufacturer's identification
1/16 (max.)
1.6
5
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