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Torque Chart

This table provides an estimate of torque required to induce corresponding clamp load in a bolt for non-critical, plated bolt, nut and washer assemblies (not tapped holes). Consult a qualified engineer for critical applications since many variables 

affect final assembly torque.

 

 

Grade 5

Grade 8

Grade L9

Size

Clamp Load

Torque

Clamp Load

Torque

Clamp Load

Torque

1/4-20  (UNC)

2,025

6 ft. lbs.

2,850

9 ft. lbs.

3,450

11 ft. lbs.

1/4-28 (UNF)

2,325

7 ft. lbs.

3,263

10 ft. lbs.

3,950

13 ft. lbs.

5/16-18 (UNC)

3,338

13 ft. lbs.

4,725

18 ft. lbs.

5,700

21 ft. lbs.

5/16-24 (UNF)

3,675

14 ft. lbs.

5,113

20 ft. lbs.

6,300

23 ft. lbs.

3/8-16 (UNC)

4,950

23 ft. lbs.

6,975

33 ft. lbs.

8,450

33 ft. lbs.

3/8-24 (UNF)

5,588

26 ft. lbs.

7,785

37 ft. lbs.

9,550

38 ft. lbs.

7/16-14 (UNC)

6,788

37 ft. lbs.

9,600

52 ft. lbs.

11,550

60 ft. lbs.

7/16-20 (UNF)

7,575

41 ft. lbs.

10,650

58 ft. lbs.

12,900

65 ft. lbs.

1/2-13 (UNC)

9,075

57 ft. lbs.

12,750

80 ft. lbs.

15,450

95 ft. lbs.

1/2-20 (UNF)

10,200

64 ft. lbs.

14,400

90 ft. lbs.

17,400

105 ft. lbs.

9/16-12 (UNC)

11,625

82 ft. lbs.

16,350

115 ft. lbs.

19,800

140 ft. lbs.

9/16-18 (UNF)

12,975

91 ft. lbs.

18,300

129 ft. lbs.

22,100

150 ft. lbs.

5/8-11 (UNC)

14,400

112 ft. lbs.

20,325

159 ft. lbs.

24,550

185 ft. lbs.

5/8-18 (UNF)

16,350

128 ft. lbs.

23,125

180 ft. lbs.

27,800

205 ft. lbs.

3/4-10 (UNC)

21,300

200 ft. lbs.

30,075

282 ft. lbs.

36,350

290 ft. lbs.

3/4-16 (UNF)

23,775

223 ft. lbs.

33,600

315 ft. lbs.

40,600

355 ft. lbs.

7/8-9 (UNC)

29,475

322 ft. lbs.

41,550

454 ft. lbs.

50,300

505 ft. lbs.

7/8-14 (UNF)

32,475

355 ft. lbs.

45,825

501 ft. lbs.

55,400

585 ft. lbs.

1-8 (UNC)

38,625

483 ft. lbs.

54,525

682 ft. lbs.

65,900

775 ft. lbs.

1-14 (UNF)

42,300

541 ft. lbs.

61,125

764 ft. lbs.

73,800

900 ft. lbs.

1-1/8-7 (UNC)

42,375

596 ft. lbs.

68,700

966 ft. lbs.

83,000

1150 ft. lbs.

1-1/8-12 (UNF)

47,475

668 ft. lbs.

77,025

1083 ft. lbs.

93,100

1325 ft. lbs.

1-1/4-7 (UNC)

53,775

840 ft. lbs.

87,225

1363 ft. lbs.

105,400

1600 ft. lbs.

1-1/4-12 (UNF)

59,550

930 ft. lbs.

96,600

2012 ft. lbs.

116,700

1750 ft. lbs.


*Above values are for zinc plated nut and bolt assemblies. Increase torque by 33% if using unplated 
(dry, unlubricated) nut and bolt assemblies. Decrease torque by 45% if using lubricants (oil, grease, 
or antisieze lubricants). 

 

 

 

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