RECOMMENDED ASSEMBLY TORQUES

[Pages:6]To convert kN to lbf: Multiply kN by 224.809 To convert Nm to lbft: Multiply Nm by 0.737562

RECOMMENDED ASSEMBLY TORQUES

Class 4.6 ISO Metric Coarse Pitch Bolts & Screws

Bolt Tension

Corresponding to

65% of Proof Load

Diameter

Pitch

kN

M1.6

0.35

0.19

M2

0.40

0.31

M2.5

0.45

0.50

M3

0.50

0.73

M4

0.70

1.29

M5

0.80

2.08

M6

1.00

2.94

M8

1.25

5.34

M10

1.5

8.45

M12

1.75

12.4

M14

2.00

16.8

M16

2.00

22.9

M18

2.5

28.1

M20

2.5

35.8

M22

2.5

44.3

M24

3.00

51.6

M27

3.00

67.0

M30

3.50

81.9

M33

3.50

101

M36

4.00

120

M39

4.00

143

M42

4.50

164

M48

5.00

215

M56

5.50

298

M64

6.00

393

Recommended Assembly Torque Nm 0.06 0.12 0.25 0.44 1.00 2.1 3.5 8.5 17 30 47 73 101 143 195 248 362 491 669 864 1115 1378 2064 3338 5030

Surface Condition Torque Adjustment Factors

Plain Steel, as supplied

X 1.0

Plain Steel, degreased

X 2.0

Zinc Plated, as supplied

X 1.0

Zinc Plated, lightly oiled

X 0.9

Galvanised, degreased

X 2.1

Galvanised, lightly oiled

X 1.1

Heavily greased

X 0.7

Page 1

To convert kN to lbf: Multiply kN by 224.809 To convert Nm to lbft: Multiply Nm by 0.737562

RECOMMENDED ASSEMBLY TORQUES

Class 8.8 ISO Metric Coarse Pitch Bolts & Screws

Bolt Tension

Corresponding to

65% of Proof Load

Diameter

Pitch

kN

M1.6

0.35

0.48

M2

0.40

0.78

M2.5

0.45

1.28

M3

0.50

1.9

M4

0.70

3.32

M5

0.80

5.35

M6

1.00

7.54

M8

1.25

13.8

M10

1.5

21.9

M12

1.75

31.8

M14

2.00

43.4

M16

2.00

59.2

M18

2.5

74.8

M20

2.5

95.6

M22

2.5

118

M24

3.00

138

M27

3.00

179

M30

3.50

219

M33

3.50

270

M36

4.00

319

M39

4.00

380

M42

4.50

437

M48

5.00

M56

5.50

M64

6.00

573 792 1045

Recommended Assembly Torque Nm 0.15 0.31 0.64 1.1 2.7 5 9 22 44 77 122 190 269 372 519 640 967 1314 1782 2297 2970 3671 5500 8870 13376

Surface Condition Torque Adjustment Factors

Plain Steel, as supplied

X 1.0

Plain Steel, degreased

X 2.0

Zinc Plated, as supplied

X 1.0

Zinc Plated, lightly oiled

X 0.9

Galvanised, degreased

X 2.1

Galvanised, lightly oiled

X 1.1

Heavily greased

X 0.7

Page 2

To convert kN to lbf: Multiply kN by 224.809 To convert Nm to lbft: Multiply Nm by 0.737562

RECOMMENDED ASSEMBLY TORQUES

Class 10.9 ISO Metric Coarse Pitch Bolts & Screws

Diameter

Pitch

Bolt Tension Corresponding to 65% of Proof Load

kN

M5

0.80

7.67

M6

1.00

10.9

M8

1.25

19.8

M10

1.5

31.3

M12

1.75

45.5

M14

2.00

62.1

M16

2.00

84.5

M18

2.5

103

M20

2.5

132

M22

2.5

164

M24

3.00

190

M27

3.00

248

M30

3.50

303

M33

3.50

371

M36

4.00

441

M39

4.00

527

Recommended Assembly Torque Nm 8 13 32 63 109 174 270 371 528 722 914 1339 1817 2449 31173 4110

Class 12.9 ISO Metric Coarse Pitch Bolts & Screws

Bolt Tension

Corresponding to

65% of Proof Load

Diameter

Pitch

kN

M3

0.50

3.17

M4

0.70

5.54

M5

0.80

8.97

M6

1.00

12.7

M8

1.25

23.1

M10

1.5

36.6

M12

1.75

53.2

M14

2.00

72.8

M16

2.00

98.8

M18

2.5

121

M20

2.5

155

M22

2.5

191

M24

3.00

222

M27

3.00

289

M30

3.50

354

M33

3.50

437

M36

4.00

515

Recommended Assembly Torque Nm 1.9 4.4 8.9 15 37 73 128 203 316 436 620 840 1066 1561 2124 2884 3708

Surface Condition Torque Adjustment Factors

Plain Steel, as supplied

X 1.0

Plain Steel, degreased

X 2.0

Zinc Plated, as supplied

X 1.0

Zinc Plated, lightly oiled

X 0.9

Galvanised, degreased

X 2.1

Galvanised, lightly oiled

X 1.1

Heavily greased

X 0.7

Page 3

To convert lbf to kN: Multiply kN by 224.809 To convert lbft to Nm: Multiply lbft by 1.35582

RECOMMENDED ASSEMBLY TORQUES

SAE Grade 5 Bolts & Screws - UNF Thread

Bolt Tension

Corresponding to 65% of Proof Load

Diameter

TPI

lbf

1/4

28

5/16

24

2010 3180

3/8

24

7/16

20

4840 6560

1/2

20

9/16

18

8840 11240

5/8

18

3/4

16

14170 20600

7/8

14

28100

1

12

1.1/8

12

36600 41100

1.1/4

12

1.3/8

12

1.1/2

12

51600 63200 76000

Recommended Assembly Torque lbft 8 17 30 48 74 105 148 258 410 610 771 1075 1448 1900

SAE Grade 8 Bolts & Screws - UNF Thread

Diameter

TPI

Bolt Tension Corresponding to 65% of Proof Load

lbf

1/4

28

5/16

24

3/8

24

7/16

20

1/2

20

9/16

18

5/8

18

3/4

16

7/8

14

1

12

1.1/8

12

1.1/4

12

1.3/8

12

1.1/2

12

2820 4510 6820 9230 12480 15860 19950 29120 39700 51700 66700 83700 102500 123300

Recommended Assembly Torque lbft 12 23 43 67 104 149 208 364 579 862 1251 1744 2349 3083

SAE Grades 5 & 8 Bolts & Screws - 1" SAE

Bolt Tension Corresponding to 65% of Proof Load

1" SAE

TPI

lbf

Grade 5

14

Grade 8

14

37500 53000

Recommended Assembly Torque lbft 625 883

Surface Condition Torque Adjustment Factors

Plain Steel, as supplied

X 1.0

Plain Steel, degreased

X 2.0

Zinc Plated, as supplied

X 1.0

Zinc Plated, lightly oiled

X 0.9

Galvanised, degreased

X 2.1

Galvanised, lightly oiled

X 1.1

Heavily greased

X 0.7

Page 4

To convert lbf to kN: Multiply kN by 224.809 To convert lbft to Nm: Multiply lbft by 1.35582

RECOMMENDED ASSEMBLY TORQUES

SAE Grade 5 Bolts & Screws - UNC Thread

Bolt Tension

Corresponding to

65% of Proof Load

Diameter

TPI

lbf

1/4

20

5/16

18

1760 2890

3/8

16

7/16

14

4290 5880

1/2

13

9/16

12

7860 10070

5/8

11

12480

3/4

10

7/8

9

18460 25550

1

8

1.1/8

7

33470 36700

1.1/4

7

1.3/8

6

46600 55500

1.1/2

6

1.3/4

5

67600 91300

2

4.5

2.1/4

4.5

120200 156300

2.1/2

4

2.3/4

4

192400 237100

3

4

287100

3.1/4

4

3.1/2

4

341500 400600

3.3/4

4

4

4

464600 532900

Recommended Assembly Torque lbft 7 15 27 43 66 94 130 231 373 558 688 971 1272 1690 2663 4007 5861 8017 10867 14355 18498 23368 29038 35527

Surface Condition Torque Adjustment Factors

Plain Steel, as supplied

X 1.0

Plain Steel, degreased

X 2.0

Zinc Plated, as supplied

X 1.0

Zinc Plated, lightly oiled

X 0.9

Galvanised, degreased

X 2.1

Galvanised, lightly oiled

X 1.1

Heavily greased

X 0.7

Page 5

To convert lbf to kN: Multiply kN by 224.809 To convert lbft to Nm: Multiply lbft by 1.35582

RECOMMENDED ASSEMBLY TORQUES

SAE Grade 8 Bolts & Screws - UNC Thread

Bolt Tension

Corresponding to 65% of Proof Load

Diameter

TPI

lbf

1/4

20

5/16

18

2470 4090

3/8

16

7/16

14

6040 8320

1/2

13

9/16

12

11050 14170

5/8

11

3/4

10

17610 26060

7/8

9

36000

1

8

1.1/8

7

47200 59500

1.1/4

7

1.3/8

6

75500 90000

1.1/2

6

1.3/4

5

109500 148200

2

4.5

2.1/4

4.5

195000 253500

2.1/2

4

2.3/4

4

312000 384500

3

4

3.1/4

4

465600 553800

3.1/2

4

649700

3.3/4

4

4

4

753400 864200

Recommended Assembly Torque lbft 10 21 38 61 92 133 183 326 525 787 1116 1573 2063 2738 4323 6500 9506 13000 17623 23280 29998 37899 47088 57613

BSW Mild Steel Bolts & Screws

Diameter

TPI

1/4

20

5/16

18

3/8

16

7/16

14

1/2

12

5/8

11

3/4

10

7/8

9

1

8

1.1/8

7

1.1/4

7

1.1/2

6

Bolt Tension Corresponding to 65% of Proof Load

lbf 736 1208 1786 2451 3176 5206 7705 10641 13943 17566 22473 32334

Recommended Assembly Torque lbft 3 6 11 18 26 54 96 155 232 329 468 808

Surface Condition Torque Adjustment Factors

Plain Steel, as supplied

X 1.0

Plain Steel, degreased

X 2.0

Zinc Plated, as supplied

X 1.0

Zinc Plated, lightly oiled

X 0.9

Galvanised, degreased

X 2.1

Galvanised, lightly oiled

X 1.1

Heavily greased

X 0.7

Page 6

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