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Metric Prevailing Torque Specification

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METRIC
SIZES

PREVAILING
TORQUE

INSTALLATION
VALUES (1)

Class 8

Class 10

Nominal
Diameter
(mm)

Thread
Pitch (mm)

ISO
2320
Removal
minimum (Nm)

Security
Locknut (2)

(Nm)

Clamp
Load (N)

Dry
Tightening
Torque (3)
(Nm)

Lubricated
Tightening
Torque (4)
(Nm)

Clamp
Load
(N)

Dry
Tightening
Torque (3)
(Nm)

Lubricated
Tightening
Torque (4)
(Nm)

10

1.50

1.4

3.0

22,181

44

33

30,662

61

46

10

1.25

1.4

3.0

23,408

47

35

32,359

65

49

12

1.75

2.1

4.0

32,232

77

58

44,556

107

80

12

1.25

2.1

4.0

35,218

85

63

48,683

117

88

16

2.00

4.2

6.0

59,926

192

144

82,838

265

199

16

1.50

4.2

6.0

63,973

205

154

88,433

283

212

20

2.50

7.0

15.0

93,634

375

281

129,435

518

388

20

1.50

7.0

15.0

103,850

415

312

143,558

574

431

24

3.00

10.5

20.0

134,833

647

485

186,387

895

671

24

2.00

10.5

20.0

147,039

706

529

203,260

976

732

27

3.00

12.0

22.0

175,723

949

712

243,084

1,313

984

27

2.00

12.0

22.0

189,621

1,024

768

262,309

1,416

1,062

30

3.50

14.0

26.0

214,425

1,287

965

296,411

1,778

1,334

30

2.00

14.0

26.0

237,610

1,426

1,069

328,460

1,971

1,478

33

3.50

15.5

29.0

265,284

1,751

1,313

366,717

2,420

1,815

33

2.00

15.5

29.0

291,006

1,921

1,440

402,273

2,655

1,991

36

4.00

17.5

30.0

312,397

2,249

1,687

431,842

3,109

2,332

36

3.00

17.5

30.0

330,839

2,382

1,787

457,336

3,293

2,470

39

4.00

19.5

33.0

373,226

2,911

2,183

515,930

4,024

3,018

39

3.00

19.5

33.0

393,359

3,068

2,301

543,761

4,241

3,181

1) Installation torque and clamp load are calculated using the proof load for the class bolt and nut specified multiplied by 0.75 for a factor of safety and multiplied by 0.85 to account for material removal for the locking mechanism. Proof load used for Class 8 calculation is 600 N/mm2. Proof load used for Class 10 calculation is 830 N/mm2.
2) The value shown is the approximate installation and removal prevailing torque for the Security Locknut. The prevailing torque will vary less than 75% from the value shown from the first to the fifth installation and beyond.
3) Calculated using formula: Nominal diameter x Clamp Load (from note 1) x Friction factor (dimensionless value of 0.20 for dry installation).
4) Calculated using formula: Nominal diameter x Clamp load (from note 1) x Friction factor (dimensionless value of 0.15 for lubricated installation).

 

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