Regular Pitch (Coarse Thread)METRIC TORQUE TIGHTENING GUIDES FOR PLATED FASTENERS

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Class 10.9 Coarse Thread

DiameterTorque

Newton-Meters Foot-Pounds

4mm x 0.7 4.1 35mm x 0.8 8.1 6 6mm x 1.0 14 10 7mm x 1.0 23 17

8mm x 1.25 34 25 10mm x 1.50 67 49 12mm x 1.75 117 86 14mm x 2.0 185 136 16mm x 2.0 285 210 18mm x 2.5 390 287 20mm x 2.5 550 405 22mm x 2.5 745 549

Class 8.8 Coarse Thread

DiameterTorque

Newton-Meters Foot-Pounds

4mm x 0.7 2.9 2.1 5mm x 0.8 5.8 4.2 6mm x 1.0 9.9 7.3 7mm x 1.0 16.5 12.1

8mm x 1.25 24 17.7 10mm x 1.50 48 35 12mm x 1.75 83 61 14mm x 2.0 132 97 16mm x 2.0 200 14718mm x 2.5 275 203 20mm x 2.5 390 287 22mm x 2.5 530 391

These figures represent an estimate of the torque required to induce a given preload (clampload) equivalent to 90% of the Yield Strength in a bolt for non-critical applications only. For critical or special applications where greater control is desired, this should be determined experimentally. Because of the many interrelated variables that directly or indirectly affect friction, such as surface texture, type of coating or finish, lubrication, speed of tightening, human error, etc., it is possible to experience as much as ± 25% deviation in preload with the use of a torque wrench. If 90% of the yield strength is not to be exceeded, it is generally recommended to reduce torque values by half the tolerance of the torque wrench used.