STANDARD BOLT & NUT TIGHTENING TORQUE ~ndicated Therefore, judge the tightening torque as Standard bolt and nut ttghtening torques are not descr~bed below tightenrng torque from the tightening torque table 2 The 1 Find out the type of bolt from the list below Then, judge the bolt nut tightening torque can be judged in the same way according to the type of the mating bolt DlSRlMlNATlON OF BOLT STRENGTH 1 Discriminat~on by actual bolt 2 Discrimination by part number BAHS28 BAHS2 1 Shape and description St cr oe dn eg th I Hexagon bolt / I Part number example 3 - 4 0 6 0 L- Nominal size (mm) l ~ o m ~ nd laa ml e ter Length to bottom surface of head Stud b o l t 1 Part number example 9 2 1 3 2 - 4 0 6 14 under head imm) L nai;;; siz; Strength code Nomlnal d~ameter Length 4=4T Number in relief or 5=5T 1 hallmark on head 6=6T Hexagon I 7=7T bolt I I I Standard ; I I I head I No mark 1 Hexagon bolt head I I I Hexagon 1 I 1 I Bolt with two relief Standard I llnes on head bolt I Hexagon bolt Collar head I I I Bolt with two relief I n e s on head I 6T I I Hexagon 1 Boit w ~ t hth ree relief 7T 1 bolt llnes on head I !
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