4-9
[Table 2]
Nominal
size
(a; mm)
Width
across flat
(b; mm)
[3] Bolt marked with “12.9” (strength
classification) on its head
[4] Other bolts
Tightening torque {N▪m (kgf▪m)} Tightening torque {N▪m (kgf▪m)}
Target value Tolerance Target value Tolerance
6 10 13.0 (1.30) 11.1-15.0 (1.11-1.50) 3.0 (0.30) 2.6-3.5 (0.26-0.35)
8 13 31.5 (3.20) 26.8-36.2 (2.72-3.70) 7.5 (0.75) 6.5-8.6 (0.65-0.85)
10 17 62.5 (6.40) 53.1-71.9 (5.44-7.35) 14.5 (1.45) 12.6-16.7 (1.25-1.65)
12 19 109 (11.1) 92.7-125 (9.44-12.8) 25.0 (2.55) 21.7-28.8 (2.20-2.95)
14 22 174 (17.7) 148-200 (15.0-20.4) 40.0 (4.10) 34.8-46.0 (3.55-4.70)
16 24 271 (27.7) 230-312 (23.5-31.9) 62.5 (6.40) 54.3-71.9 (5.55-7.35)
18 27 373 (38.1) 317-429 (32.4-43.8) 86.0 (8.75) 74.8-98.9 (7.60-10.0)
20 30 529 (54.0) 450-608 (45.9-62.1) 122 (12.4) 106-140 (10.8-14.3)
22 32 720 (73.4) 612-828 (62.4-84.4) 166 (16.9) 144-191 (14.7-19.4)
24 36 915 (93.3) 778-1050 (79.3-107) 211 (21.5) 183-243 (18.7-24.7)
27 41 1340 (136) 1140-1540 (116-156) 309 (31.4) 269-355 (27.3-36.1)
30 46 1820 (185) 1550-2090 (157-213) 419 (42.6) 364-482 (37.0-49.0)
33 50 2470 (252) 2100-2840 (214-290) 570 (58.0) 495-656 (50.4-66.7)
36 55 3180 (324) 2700-3660 (275-373) 732 (74.5) 636-842 (64.8-85.7)
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