TB 43-0218
NOTE
Grades B and C apply to SAE class nuts only.
Table 4-1 applies to COARSE threads.
TABLE 4-1. STEEL HEX LOCKNUTS
RELATIONSHIP OF THREAD SIZE, TORQUE AND GRADE
SIZE & # THREADS
GRADE B
GRADE C
GRADE B
GRADE C
1/4-20
60-85 LB/IN
85-125 LB/IN
7-10 N/M
10-14 N/M
5/16-18
110-150 LB/IN
130-190 LB/IN
15-21 N/M
15-21 N/M
3/8-16
15-20 LB/FT
20-28 LB/FT
20-27N/M
27-38 N/M
7/16-14
23-32 LB/FT
31-43 LB/FT
31-43N/M
42-58 N/M
1/2-13
37-50 LB/FT
45-63 LB/FT
50-68 N/M
61-85 N/M
9/16-12
50-70 LB/FT
70-90 LB/FT
68-95 N/M
95-122 N/M
5/8-11
70-95 LB/FT
90-123 LB/FT
95-129 N/M
122-166 N/M
3/4-10
125-165 LB/FT
155-210 LB/FT
170-224 N/M
210-285 N/M
7/8-9
185-250 LB/FT
225-313LB/FT
251-339 NM
305-423 NM
1/8
275-375 LB/FT
350-463LB/F
T373-509 NM
475-627 NM
NOTE
Grades B and C apply to SAE class nuts only.
The following table applies to FINE threads.
TABLE 4-2. STEEL HEX LOCKNUTS
RELATIONSHIP OF THREAD SIZE, TORQUE AND GRADE
SIZE & # THREADS
GRADE B
GRADE C
GRADE B
GRADE C
1/4-28
65-90 LB/IN
85-125 LB/IN
7-10 N/M
10-14 N/M
5/16-24
120-160 LB/IN
140-200 LB/FT
14-18 N/M
16-23 N/M
3/8-24
16-22 LB/FT
21-29 LB/FT
22-30 N/M
28-39 N/M
7/16-20
24-34 LB/FT
31-43 LB/FT
33-46 NM
42-58 N/M
1/2-20
38-53LB/FT
50-70 LB/FT
51-71 N/M
68-95 N/M
9/16-18
58-78LB/FT
70-95 LB/FT
78-105 N/M
95-129 N/M
5/8-18
120-165 LB/FT
155-210 LB/FT
163-224 N/M
210-285 N/M
7/8-14
200-270 LB/FT
225-313LB/FT
271-366 N/M
305-424 N/M
1-14
300-400 LB/FT
363-500LB/FT
407-542 N/M
492-678 N/M
7
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