MIL-DTL-25308C
3.13.1 Markings. The markings shall be as specified in table III. Unless specified, the location
of the markings are optional.
TABLE III. Marking details.
Height or length,
Width of line or
Color
in.
Graduation, in.
Per FED-STD-595
±0.016
±0.005
Numerals, 0, 1, 2, 3, 4
0.156
0.025
37875
Major graduations
0.188
0.031
37875
Minor graduations
0.094
0.020
37875
Lettering "HYD PRESS"
0.125
0.025
37875
Lettering "PSI X 1000"
0.094
0.020
37875
Lettering :"USAF TYPE ME-1"
0.063
37038
Dial face
37038
All other markings
37038
3.14 Screw threads. Unless otherwise specified, screw threads shall be in accordance with MIL-
S-7742.
3.15 Lubricants. Lubricants shall conform to MIL-L-6085.
3.16 Weight. The weight of the gage shall not exceed 0.5 lbs.
3.17 Jewel bearing. When synthetic sapphire or ruby bearings are used, they shall conform to
MIL-B-27497.
3.18 Finishes and protective coatings.
3.18.1 Aluminum-alloy parts. Aluminum alloy parts shall be covered with an anodic film
conforming to MIL-A-8625, except as follows:
3.18.1.1 Dials, small holes and inserts. Dials, small holes, and case inserts need not be
anodized.
3.18.1.2 Non-anodizable alloys. Aluminum alloys which do not anodize satisfactorily shall be
coated with a chemical film in accordance with MIL-C-5541.
3.18.1.3 Paint base. Where the primary purpose of the treatment is to afford a suitable paint
base, chemical treatments in accordance with MIL-C-5541 may be used in lieu of anodizing.
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