There are bolt contraction torque decision standards in KSB 0101 for high tension bolt( torque calculation method) and in KSB 0140 for general bolts(bolt torque decision general rule), But in using bolt torque decision general rule method, friction coefficients between bolt and to-be-bolted object will rule the calculated yielding contraction axle force and yielding contraction torque, making it hard to determine the contraction torque in the field.
So in other to determine the contraction torque for general bolts in field using high tension bolt torque decision method, the torque decision method for general bolt is proposed referencing high tension bolt torque decision method. And the field torque test is planned to verify the adaptability of the proposed method in the field.