TABLE 4 BOLT TIGHTENING TORQUE CHART (FOR GENERAL PURPOSE) Bolt Best tightening conditions. diamEven tightening area. Bolt, nut, eter coating, naked bolt, lubricant, etc.
Medium tightening conditions. Cast iron or aluminum tightening surfaces.
(mm)
N·m
N·m
3
0.5-1
4
1.5-2.5
5 6 8 10 12 14 16 18 20 22 24 26 28 30
3.5-5 5.5- 8.5 12.5-18.5 25-32 42-64 72- 110 110-165 155- 245 225- 345 305-470 410- 620 520- 785 655- 980 825-1,275
lbf-ft
6-8.6 (lb.in)
14.8-21.6 (lb.in)
2.5- 3.6 4- 6.4 10-13 18-23 32-46 53-79 80-122 116 -180 167 - 253 225- 347 304-455 384- 578 485- 723 608- 939
kgf·cm
7-10
1 -1.5
17-25
2.5-3
34-51 5-7 55-88 8 -11 130- 190 18.5- 25 250- 330 37-49 430- 650 64-85 730- 1,100 110 - 145 1, 100 - 1, 700 165 - 225 1,600 - 2,500 245- 325 2,300 - 3,500 345-460 3,100 - 4,800 470 - 630 4,200 - 6,300 620-825 5,300 - 8,000 785-1,080 6,700- 10,000 980-1,375 8,400 - 13,000 1,275 - 1,66!:
lbf-ft
8.7-12.1 (lb.in)
1.8-2.3
kgf·cm
Poor tightening conditions. rT"ightening area having black coarse surface. Naked bolt or lubricant unavailable. N·m
10-14
1.5-2
25-33
3-4
lbf-ft
12.2 -15.6 (lb.in)
2.4-2.9
kgf·cm
14-18 33-41
3.7 -4.9 51 -69 7-8.5 5-6.2 69-86 6-7.9 83 -110 11 -13.5 8-10 110- 140 14-18 190- 260 25-31 19-23 260-320 28-36 380- 500 49-62 37-45 500-630 47-62 650- 870 85-110 63-79 870- 1,100 80-108 1,100 - 1,500 145-175 109 -130 1,500 - 1,800 123- 166 1,700 - 2,300 225-285 167 - 209 2,300 - 2,900 181 - 238 2,500 - 3,300 325- 410 239- 303 3,300 - 4,200 254-339 3,500 - 4,700 460- 580 340-426 4,700 - 5,900 348-462 4,800 - 6,400 630- 785 463- 578 6,400 - 8,000 456- 607 6,300 - 8,400 825-1,080 608- 795 8,400 - 11,000 579- 795 8,000 - 11,000 1,080 - 1,375 796-1,012 11,000-14,000 724-1,012 10,000 - 14,000 1,375 - 1,665 1,013 - 1,229 14,000 - 17,000 940-1,229 13,000 -17,000 1,665 - 2,060 1,230 - 1,51 E 17,000 - 21,000 7-103