Metric Bolt Torque Table
Estimated with clamp load as 75% of proof load
as specified in ISO 898-1

Property
Class

8.8 Grade Hex
               

10.9 Grade Hex
               

12.9 Socket Head 

Cap Screw

 Minimum Tensile 
Strength MPa

M6 - M16:  800
M20 - M30:  830

1040

1220

Nominal Size
and
Thread Pitch

Bolt Torque Specs in Newton Meters - Nm

Dry

Lubed

Dry

Lubed

Dry

Lubed

M5 x 0.80

6.1

4.6

8.8

6.7

10.3

7.7

M6 x 1.00

10.4

7.8

15

11.2

17.6

13.1

M7 x 1.00

17.6

13.1

25.1

18.9

29.4

22

M8 x 1.25

25.4

19.1

37.6

27.3

42.6

32.1

M10 x 1.50

50

38

72

54

84

64

M12 x 1.75

88

66

126

94

146

110

M14 x 2.00

141

106

201

150

235

176

M16 x 2.00

218

164

312

233

365

274

M18 x 2.50

301

226

431

323

504

378

M20 x 2.50

426

319

609

457

712

534

M22 x 2.50

580

435

831

624

971

728

M24 x 3.00

736

552

1052

789

1231

923

M27 x 3.00

1079

809

1544

1158

1805

1353

M30 x 3.50

1463

1097

2092

1570

2446

1834

M33 x 3.50

1990

1493

2849

2137

3328

2497

M36 x 4.00

2557

1918

3659

2744

4276

3208

 Lubed means cleaned dry bolts lubricated with a standard medium viscosity 
 machine oil. Lubricate all contact areas of the bolts and washers. Lubricating
 the bolts is the suggested method.