Screw & Locking Washer Table
HEX NUT AND INTERNAL TOOTH LOCKWASHER
THREAD
A
B
C
D
HEX NUT
WASHER
Size Thread
Hex Nut
Lockwasher
A
B
C
D
4-40 UNC-2B
(.112-40)
.187*
.180
.257
.241
.067*
.057
.083
.073
.225*
.215
.265
.255
.020*
.010
.018
.012
(STD)
(ALT)
8-32 UNC-2B
(.164-32)
.250*
.241
.313
.307
.083*
.073
.114
.104
.285*
.275
.336
.325
.025*
.015
.025
.015
(STD)
(ALT)
10-32 UNF-2B
(.190-32)
.250
.241
.345
.336
.080
.070
.130
.120
.311
.300
.381
.370
.023
.013
.027
.017
(STD)
(ALT)
12-32 UNEF-2B
(.216-32)
.250
.241
.250*
.241
.083
.073
.073*
.063
.383
.372
.383*
.372
.023
.013
.023*
.013
(STD)
(ALT)
1/4-28 UNF-2B
(.250-28)
.311*
.308
.096*
.091
.408*
.396
.021*
.015
5/16-24 UNF-2B
(.312-24)
.377*
.365
.096*
.091
.435*
.425
.027*
.017
*Used for MIL-F-28861 units.
Thread
Recommended Mounting Torque
(.112-40)
4-40 UNC-2A
32 oz-in. 4 oz-in.
(.164-32)
64 oz-in. 4 oz-in.
64 oz-in. 4 oz-in.
64 oz-in. 4 oz-in.
44 oz-in. 4 oz-in.
60 oz-in. 4 oz-in.
8-32 UNC-2A
(.190-32)
10-32 UNC-2A
(.216-32)
12-32 UNEF-2A
(.250-28)
1/4-28 UNF-2A
(.312-24)
5/16-24 UNF-2A
4