STANDARD BOLT & NUT TIGHTENING TORQUE Standard bolt and nut tightening torques are not indicated. Judge the standard tightening torque as shown below. 1. Find out the straight type of bolt from the list below and then find the bolt tightening torque from the table. 2. The nut tightening torque can be judged from the mating bolt type. BOLT STRENGTH TYPE IDENTIFICATION METHOD 1. Identification by bolt shape 2. Identification by part No. Shape and identification method Strength type I Hexagon bolt Part NO. example - 9 I 1 1 1 4 0 61 0 -1 T ~ e n g t uh n der head (mm) Nominal diamter (mm) - - Strength type I Nominal diameter Length under head Stud bolt Part No.
example 9 2 1 3 2 - 4 - 0 6 1 4 1 T ~ e n g t (hm m) Nominal diameter (mm) - Strength type Nominal diameter Length Standard hexagon bolt 0 Number in relief or hallmark on the head 4 = 4T 5 = 5T 6 = 6T 7 = 7T @ No mark 4T