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Bolting Assembly Torque Values

Size

Tensile Stress

Area As
Sq. In.

SA193 & ASTM 193 B7 Studs with
A194 2H Heavy Hex Nuts

 

 

Size

SA193 & ASTM 193 B7M Studs with
A194 2HM Heavy Hex Nuts

Clamp
Load P
Lbs.

Tightening Torque

Clamp
Load P
Lbs.

Tightening Torque

Dry
K = .223

Lubed
K= .167

Dry
K = .223

Lubed
K=.167

Ft. Lbs.

Ft. Lbs.

Ft. Lbs.

Ft. Lbs.

1/2-13
9/16-12
5/8-11
3/4-10

0.138
0.177
0.220
0.327

10,350
13,275
16,500
24,525

96
139
192
342

72
104
143
256

1/2-13
9/16-12
5/8-11
3/4-10

7,866
10,089
12,540
18,639

73
105
146
260

55
79
109
194

7/8-9
1-8
1-1/8-8
1-1/4-8

0.452
0.594
0.776
0.984

33,900
44,550
58,200
73,800

551
828
1,217
1,714

413
620
911
1,284

7/8-9
1-8
1-1/8-8
1-1/4-8

25,764
33,858
44,232
56,088

419
629
925
1,303

314
471
692
976

1-3/8-8
1-1/2-8
1-5/8-8
1-3/4-8

1.215
1.471
1.769
2.06

91,125
110,325
132,675
154,500

2,328
3,076
4,006
5,024

1,744
2,303
3,000
3,763

1-3/8-8
1-1/2-8
1-5/8-8
1-3/4-8

69,255
83,847
100,833
117,420

1,770
2,337
3,045
3,818

1,325
1,750
2,280
2,860

1-7/8-8
2-8
2-1/4-8
2-1/2-8

2.41
2.74
3.52
4.40

180,750
205,500
264,000
330,000

6,298
7,638
11,038
15,331

4,716
5,720
8,266
11,481

1-7/8-8
2-8
2-1/4-8
2-1/2-8

137,370
156,180
200,640
250,800

4,786
5,805
8,389
11,652

3,584
4,347
6,282
8,726

 

Size

Tensile Stress

Area As
Sq. In.

SA320 & ASTM A320 L7 Studs with
A194 Gr. 4 or Gr. L7 Heavy Hex Nuts

 

Size

SA320 & ASTM A320 L7M Studs with
A194 Gr. 4 or Gr. L7M Heavy Hex Nuts

Clamp
Load P
Lbs.

Tightening Torque

Clamp
Load P
Lbs.

Tightening Torque

Dry
K = .223

Lubed
K= .167

Dry
K = .223

Lubed
K= .167

Ft. Lbs.

Ft. Lbs.

Ft. Lbs.

Ft. Lbs.

1/2-13
9/16-12
5/8-11
3/4-10

0.138
0.177
0.220
0.327

10,350
13,275
16,500
24,525

96
139
192
342

72
104
143
256

1/2-13
9/16-12
5/8-11
3/4-10

7,866
10,089
12,540
18,639

73
105
146
260

55
79
109
194

7/8-9
1-8
1-1/8-8
1-1/4-8

0.452
0.594
0.776
0.984

33,900
44,550
58,200
73,800

551
828
1,217
1,714

413
620
911
1,284

7/8-9
1-8
1-1/8-8
1-1/4-8

25,764
33,858
44,232
56,088

419
629
925
1,303

314
471
692
976

1-3/8-8
1-1/2-8
1-5/8-8
1-3/4-8

1.215
1.471
1.769
2.06

91,125
110,325
132,675
154,500

2,328
3,076
4,006
5,024

1,744
2,303
3,000
3,763

1-3/8-8
1-1/2-8
1-5/8-8
1-3/4-8

69,255
83,847
100,833
117,420

1,770
2,337
3,045
3,818

1,325
1,750
2,280
2,860

1-7/8-8
2-8
2-1/4-8
2-1/2-8

2.41
2.74
3.52
4.40

180,750
205,500
264,000
330,000

6,298
7,638
11,038
15,331

4,716
5,720
8,266
11,481

1-7/8-8
2-8
2-1/4-8
2-1/2-8

137,370
156,180
200,640
250,800

4,786
5,805
8,389
11,652

3,584
4,347
6,282
8,726


NOTE

  1. Tightening torque values from the formula T=KDP, where T= tightening torque, Ib.ft. K=torque-friction coefficient, D= nominal bolt diameter, in.; and p=bolt clamping load developed by tightening, lb.
  2. Clamp load is also known as preload or initial load in tension on bolt. Clamp load (lb.) is calculated by arbitrarily assuming useable bolt strength is 75% of bolt proof load (PSI) times the stress area (sq.in.) of threaded section of each bolt size. Higher or lower values of clamp load can be used depending on the application requirements and the judgement of the designer.
  3. No proof load has been established by ASTM. Values shown in table are assumed at 95% of yield strength.

   *  Grade 7M nuts at a hardness not exceeding 235HB (or equivalent) shall be used with Grade B7M studs.

NOTE:
Technical data contained in this section governed by ASME or other Codes/Specifications are subject to change and are therefore provided for information purposes only and are not to be used for design purposes. Refer to latest edition of applicable Code/Specification and addendums thereto for required design data.