STANDARD TORQUE SPECIFICATIONS AND CAP SCREW MARKINGS

When torquing bolts all threads should be clean and oiled with a light oil.

1 or 2

5

6 or 7

8

Cap screw Head Markings
Manufacture's marks
may vary. Three-line
markings on heads below
indicate SAE Grade 5.

Indeterminate

Minimum Commercial

Medium Commercial

Best Commercial

(inches)-(thread)
1/4 - 20
      - 28

Ft-Lb
5
6

kgm
0.6915
0.8298

Nm
6.7791
8.1349

Ft-Lb
8
10

kgm
1.1064
1.3830

Nm
10.8465
13.5582

Ft-Lb
10

kgm
1.3630

Nm
13.5582

Ft-Lb
12
14

kgm
1.6596
1.9362

Nm
16.2698
18.9815

5/16 - 18
      -24

11
13

1.5213
1.7979

14.9140
17.6256

17
19

2.3511
2.6277

23.0489
25.7605

19

2.6277

25.7605

24
27

3.3192
3.7341

32.5396
36.6071

3/8 - 16
      - 24

18
20

2.4894
2.7660

24.4047
27.1164

31
35

4.2873
4.8405

42.0304
47.4536

34

4.7022

46.0978

44
49

6.0852
6.7767

59.6560
66.4351

7/16 - 14
      - 20

28
30

3.8132
4.1490

37.9629
40.6745

49
55

6.7767
7.6065

66.4351
74.5700

55

7.6065

74.5700

70
78

9.6810
10.7874

94.9073
105.7538

1/2 - 13
      - 20

39
41

5.3937
5.6703

52.8769
55.5885

75
85

10.3785
11.7555

101.6863
115.2445

85

11.7555

115.2445

105
120

14.5215
16.5860

142.3609
162.6960

9/16 - 12
      - 18

51
55

7.0533
7.6065

69.1467
74.5700

110
120

15.2130
16.5960

149.1380
162.6960

120

16.5960

162.6960

155
170

21.4365
23.5110

210.1490
230.4860

5/8 - 11
      - 18

83
95

11.4789
13.1386

112.5329
128.8027

150
170

20.7450
23.5110

203.3700
230.4860

167

23.0961

226.4186

210
240

29.0430
33.1920

284.7180
325.3920

3/4 - 10
      - 16

105
115

14.5215
15.9045

142.3609
155.9170

270
295

37.3410
40.7985

366.0660
399.9610

280

38.7240

379.6240

375
420

51.8625
58.0860

508.4250
568.4360

7/8 - 9
      - 14

160
175

22.1280
24.2025

216.9280
237.2650

395
435

54.6285
60.1605

535.5410
589.7730

440

60.8520

596.5520

605
675

83.6715
93.3525

820.2590
915.1650

1 - 8
    - 14

236
250

32.5005
34.5750

318.6130
338.9500

590
660

81.5970
91.2780

799.9220
849.8280

660

91.2780

894.8280

910
990

125.8530
136.9170

1233.7780
1342.2420