MIL-PRF-26542/9C
Inches
Mm
0.05
0.002
0.13
0.005
0.41
0.016
1.78
0.070
2.18
0.086
2.77
0.109
4.01
0.158
5.54
0.218
5.59
0.220
6.35
0.250
7.14
0.281
7.95
0.313
8.38
0.330
13.08
0.515
14.78
0.582
19.46
0.766
26.59
1.047
29.62
1.166
NOTES:
1. Dimensions are in inches. Unless otherwise specified, tolerances are ± .015 (0.38 mm).
2. The microphone element shall be marked with the same PIN (i.e., M-133/U). Placement on surface shown is
optional.
3. Set-screws shall hold the part securely to the bracket, shall be slotted (for interchangeability of
spares among manufacturers and tri-Service applications), and recessed.
4. Sound aperture location and configuration are optional, provided that frequency response,
environmental and performance requirements are met as specified.
FIGURE 2. Microphone M-133/U.
2