Suggested Torque Values and Clamp Loads for Grades 2.5 and 8 Bolts
Nominal Diameter and TPI (inches)
Thread Stress Area (Sq-In)
SAE Grade Capscrews
SAE Grade 5 Capscrews
SAE Grade 8 Capscrews
Clamp Load 60-90% Proof (Pounds)
Torque (lb-ft)
Clamp Load 60-90% Proof (lbs)
Torque (lb-ft)
Clamp Load 60-90% Proof (lbs)
Torque (lb-ft)
1/4-20
0.0318
1049-1574
4-7
1622-2433
7-10
2290-3434
10-4
1/4-28
0.0364
1201.1802
5-8
1856-2785
8-12
2621-3931
11.16
5/16-18
0.0524
1729-2594
9-14
2672-4009
14-21
3773-5659
20-29
5/16-24
0.0580
1914-2871
10-15
2958-4437
15-23
4176-6264
22-33
3/8-16
0.0775
2558-3868
16-24
3953-5929
25-37
5580-8370
35-52
3/8-24
0.0878
2897-4346
18-27
4478-6717
28-42
6322-9482
40-59
7/16-14
0.1063
3508-5262
26-38
5421-8132
40-59
7654-11480
56-84
7/16-20
0.1187
3917-5876
29-43
6054-9081
44-66
8546-12820
62-93
1/2-13
0.1419
4683-7024
39-59
7237-10855
60-90
10217-15325
85-128
1/2-20
0.1599
5277-7915
44-66
8155-12232
68-102
11513-17269
96-144
9/16-12
0.1820
6006-9009
56-84
9282-13923
87-131
13104-19656
123-184
9/16-18
0.2030
6699-10049
63-94
10353-15530
97-146
14616-21924
137-206
5/8-11
0.2260
7458-11187
78-117
11526-17289
120-180
16272-24408
170-254
5/8-18
0.2560
8448-12672
88-132
13056-19584
136-204
18432-27648
192-288
3/4-10
0.3340
11022-16533
138-207
17034-25551
213-319
24048-36072
301-451
3/4-16
0.3730
12309-18464
154-231
19023-28535
238-357
26856-40284
336-504
7/8-9
0.4620
15246-22869
222-334
23562-35343
344-515
33264-46896
485-728
7/8-14
0.5090
16797-25196
245-367
25959-38939
379-568
36648-54972
534-802
1-8
0.6060
19998-29997
333-500
30906-46359
515-773
43632-65448
727-1091
1-14
0.6790
22407-33611
373-560
34629-51944
577-866
48888-73332
815-1222
1 1/8-7
0.7630
25179-37769
472-708
33877-50816
635-953
54936-82404
1030-1545
1 1/8-12
0.8560
28248-42372
530-794
38006-57010
713-1069
61632-92448
1156-1733
1 1/4-7
0.9690
31977-47966
666-999
43024-64535
896-1344
69768-104652
1454-2180
1 1/4-12
1.0730
35409-53114
738-1107
47641-71462
993-1489
77256-115884
1610-2414
AG,T803584,242 -19-13JUN00-1/1