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Toyota Supra JZA80

Standard bolt

How to determine bolt strength

Mark Class
Hexagon head bolt 4-
5-
6-
7-
8-
9-
10-
11-
4T
5T
6T
7T
8T
9T
10T
11T
No mark 4T
Hexagon flange bolt

w/ washer hexagon bolt
No mark 4T
Hexagon head bolt 2 Protruding lines 5T
Hexagon flange bolt

w/ washer hexagon bolt
2 Protruding lines 6T
Hexagon head bolt 3 Protruding lines 7T
Hexagon head bolt 4 Protruding lines 8T
Hexagon flange bolt

w/ washer hexagon bolt
4 Protruding lines 9T
Hexagon flange bolt

w/ washer hexagon bolt
5 Protruding lines 10T
Hexagon flange bolt

w/ washer hexagon bolt
6 Protruding lines 11T
Stud bolt 4T
6T
Welded bolt 4T

Specified torque for standard bolts

Class Diameter
mm
Pitch
mm
Specified torque
Hexagon head bolt Hexagon flange bolt
N·m kgf·cm ft·lbf N·m kgf·cm ft·lbf
4T 6 1 5 55 48 in.·lbf 6 60 52 in.·lbf
8 1.25 12.5 130 9 14 145 10
10 1.25 26 260 19 29 290 21
12 1.25 47 480 35 53 540 39
14 1.5 74 760 55 84 850 61
16 1.5 115 1,150 83 - - -
5T 6 1 6.5 65 56 in.·lbf 7.5 75 65 in.·lbf
8 1.25 15.5 160 12 17.5 175 13
10 1.25 32 330 24 36 360 26
12 1.25 59 600 43 65 670 48
14 1.5 91 930 67 100 1,050 76
16 1.5 140 1,400 101 - - -
6T 6 1 8 80 69 in.·lbf 9 90 78 in.·lbf
8 1.25 19 195 14 21 210 15
10 1.25 39 400 29 44 440 32
12 1.25 71 730 53 80 810 59
14 1.5 110 1,100 80 125 1,250 90
16 1.5 170 1,750 127 - - -
7T 6 1 10.5 110 8 12 120 9
8 1.25 25 260 19 28 290 21
10 1.25 52 530 38 58 590 43
12 1.25 95 970 70 105 1,050 76
14 1.5 145 1,500 108 165 1,700 123
16 1.5 230 2,300 166 - - -
8T 8 1.25 29 300 22 33 330 24
10 1.25 61 620 45 68 690 50
12 1.25 110 1,100 80 120 1,250 90
9T 8 1.25 34 340 25 37 380 27
10 1.25 70 710 51 78 790 57
12 1.25 125 1,300 94 140 1,450 105
10T 8 1.25 38 390 28 42 430 31
10 1.25 78 800 58 88 890 64
12 1.25 140 1,450 105 155 1,600 116
11T 8 1.25 42 430 31 47 480 35
10 1.25 87 890 64 97 990 72
12 1.25 155 1,600 116 175 1,800 130
This guide is based on the book edition Toyota (RM502U, 1997)

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