MIL-DTL-3950J
APPENDIX A
A.4.2 Screw with captive internal tooth lockwasher.
Thread
size
A
B
C
D
E
.260
.295
.290
.087
.020
.138-32 UNC-2A
.219
.265
.256
.071
.016
.250
.338
.322
.096
.022
.164-32 UNC-2A
.219
.327
.306
.085
.018
Screw
Material
ASTM B16, alloy UNS C36000 or C26000
(Brass)
Finish
Suitably protected to resist corrosion
MIL hardware
Can be replaced by MS51957-26 (Cross Recessed Head)
Lockwasher
Material
ASTM B16, alloy UNS C51000
(Phos bronze)
Finish
Suitably protected to resist corrosion
MIL hardware
NASM35333-105(.138) or NASM35333-106(.164)
A.4.3 Washer, lock-spring, helical series
A
B
C
Min
Max
Max
Min
Max
.141
.151
.253
.031
.037
.168
.178
.296
.040
.046
Material
SAE-AMS- QQ-S-700
Steel
Finish
Suitably protected to resist corrosion
MIL hardware
Can be replaced by NASM35338-41 (.138) & NASM35338-42 (.164)
Material
SAE-AMS-STD-66
Cres
Finish
Passivated
MIL hardware
Can be replaced by NASM35338-155 (.138) & NASM35338-156
(.164)
Material
ASTM B139, alloy UNS C51000
Bronze
Finish
Suitably protected to resist corrosion
MIL hardware
Can be replaced by NASM35338-98 (.138) & NASM35338-99 (.164)
NOTES:
1. Captive washers shall rotate freely on the terminal screw.
2. The terminal screws with the captive internal tooth lockwasher shall be threaded to within .024 of the lockwasher.
3. The terminal screw (pan head) shall be used in conjunction with the helical series lock-spring washer.
4. Dimensions are in inches.
5. Metric equivalents ( to the nearest .01 mm) are given for general information only and are based upon 1 inch =
25.4 mm.
32
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