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Bolt tightening is controlled by specific torque value. This is the most widely used method. It is reasonable way for tightening control and operation. THE EXACT TORQUE VALUES ARE FOUND BY TESTS BASED. UPON WORK EXPERIENCE. TIGHTENING TORQUES - UNTREATED SCREW (BLACK FINISH) FRICTION COEFFICIENT 0.14. Suggested bolt tightening torque in N·m (Newton metres). Wrench/spanner test torques in accordance with DIN ISO 1711-1 (minimum guaranteed values) N·m. The final tightening sequence is achieved smoothly and slowly. If lubrication is to be applied to the nut/bolt, multiply the recommended torque by theTORQUE-TENSION RELATIONSHIP FOR A307A, GRADE 5, 8 & 9 BOLTS. Locknut Size. Threads per inch Tightening Torque (in-lbs through M8; M10 & over ft-lbs). relation between the clamping force and the tightening torque Table 1. Friction in threads of different material. Bolt material. Nut material. Use specified bolts and nuts, tightening them to the torques specified in this section unless otherwise stated. • Threaded portions and bearing surfaces The importance of correct bolt tightening cannot be over emphasized. Determining the correct torque can however present problems. In preparing this guide to torque values, the following basic assumptions have been made: (a) bolts and nuts are new, standard finish, uncoated and not