MIL-DTL-5099C
be finished with lusterless black in accordance with FED-STD-595/37038. The finishing
materials shall be of a durable type to withstand usage encountered in service.
3.3.2.1 Pressure boss. The case shall have a metal boss in accordance with
SAE AS5202-04 located on the rear within 0.25 inch of the vertical and horizontal centerlines,
and shall not protrude more than 0.25 inch from the rear of the case. A 150 × 150 wire mesh
corrosion-resistant filter screen shall be firmly installed.
3.3.2.2 Reinforcement. The case around the pressure boss shall be of sufficient strength
to prevent damage to the case when the connection is tightened during installation of the
indicator.
3.3.2.3 Bezel ring. The bezel ring shall be held in place by means of screws properly
secured with lock washers. Provision shall be made for the replacement of the cover glass by
removal of the bezel ring.
3.3.3 Weight. The weight of the completely assembled indicator shall not exceed
0.5 pound.
3.3.4 Screw threads. Screw threads shall be in accordance with MIL-S-7742.
3.4 Dial and pointer.
3.4.1 Dial. The dial shall be securely mounted in such a manner that it will not loosen or
slip when the indicator is vibrated. If screws are used, they shall be so located that they will not
interfere with the proper location of any dial marking.
3.4.1.1 Visibility of dial. The pointer, the numerals, at least 0.031 inch of the shortest
graduations, and all other specified markings on the dial shall be visible from any point within
the frustum of a cone whose side makes an angle of 30 degrees with a perpendicular to the dial,
and whose small diameter is the aperture of the case.
3.4.1.2 Dial marking. The dial shall be marked and finished as shown in figure 1. The
colors shall not change as a result of service use or subjecting the indicator to the inspections
specified herein. The form of the numerals and letters shall be in accordance with MS33558.
Numerals shall distinctly indicate the graduation to which each applies. If practicable, each
numeral shall be placed so that the center of area of the numeral(s) is on the radial line joining
the appropriate graduation and the center of the dial. Any confusion resulting in doubt as to the
graduation to which the numeral applies shall be cause for rejection. When several numerals are
used in one group, the space between the numerals shall be not less than 0.016 inch.
3.4.2 Pointer. The pointer of the indicator shall be firmly attached to the mechanism, but
also shall be readily removable during servicing or overhaul. The pointer form, dimensions, and
finish shall conform to the requirements shown in figure 1.
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