MIL-DTL-25308C
protected to satisfactorily withstand the environmental conditions specified herein. Synthetic
material shall be of a thermal-setting type composed of a suitable filler and phenal condensation
product binder.
3.6 Mounting nuts. When attached insert nuts are used, each mounting lug shall be fitted with
#6 (0.138 inch)-32 UNC-2B self-locking insert nuts which shall be so attached as to prevent
loosening under an axial load of 25 pounds (lbs) and prevent turning under a torque of 10 inch-
pounds (in-lbs).
3.7 Boss. The boss on the gage shall conform to SAE AS5202-04. Flats shall be provided on
the side of the boss for a minimum distance of 0.375 in. to permit the use of a wrench to tighten
the mating fitting.
3.8 Cover glass. The cover glass shall be in accordance with MS28105. The thickness shall be
the minimum practicable and entirely suitable for the purpose.
3.9 Dial to cover glass distance. The distance between the inner surface of the cover glass and
the dial shall be the minimum practicable and shall not exceed 0.125 in.
3.10 Cover glass to edge of case distance. The distance between the outer surface of the cover
glass and the front edge of the case shall be the minimum practicable and shall not exceed 0.031
in.
3.11 Pointer. The pointer shall conform to figure 2.
3.11.1 Pointer finish. The visible portion of the pointer shall be lusterless white per FED-STD-
595, color 37875.
3.12 Overpressure stop. An overpressure stop shall be provided to restrain the prime mover and
to prevent disengagement of the pinion and sector gears during service use and under the test
conditions specified herein. The stop shall allow the pointer to travel beyond full scale and to a
point within ±10° from the horizontal centerline of the dial.
3.12.1 Range marks. Two range marks of lusterless black per FED-STD-595, color 37038 shall
be located 10° on either side of the horizontal centerline on the right-hand side of the dial.
3.13 Dial. The dial shall conform to figure 1 and shall be constructed of metal. The minimum
diameter across the outside ends of the graduation marks shall be 1.75 in. The 2,000 psi
graduation shall be located on the horizontal centerline at the left side of the dial. If screws are
used to fasten the dial, they shall be located on the horizontal centerline of the dial.
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