Torque table for bolt tightening pdf

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Tool selection reference. Recommended torque table. 6.8. Bolts strength grade. Minimum broken strength. 4.8. 392Mpa. 8.8. 588Mpa 784Mpa. Recommended torque.Where the property class differs between the nut and bolt (or stud bolt), use the tightening torque specified in the table for the bolt. Tightening torque is not influenced by the bolt length so easy to standardize. Note: The values in this table are for standard screw joints. Suggested bolt tightening torque in Nm. (Newton metres). These torque levels are guideline values for metric standard threads in. FAILURE OF THREADED FASTENERS DUE TO OVER - TIGHTENING CAN OCCUR BY BOLT SHANK FRACTURE OR BY STRIPPING THE EXACT TORQUE VALUES ARE FOUND BY TESTS BASED. relation between the clamping force and the tightening torque Table 1. Friction in threads of different material. Bolt material. Nut material. The final tightening sequence is achieved smoothly and slowly. If lubrication is to be applied to the nut/bolt, multiply the recommended torque by the the final tightening sequence is achieved smoothly and slowly, until the torque tool Recommended Maximum Bolt Loads and Torque Values (UNC Threads). Tightening Torque (in-lbs through M8; M10 & over ft-lbs). METRIC FASTENERS. Nominal Size or Basic. Screw Dia. Threads per inch. Tensile Stress.