INTRODUCTION
GRADE 2 * GRADE 5, 5.1 or 5.2 GRADE 8 or 8.2 GRADE L9 (Alloy)
Dry **
Lubricated
**
Dry**
Lubricated
**
Dry**
Lubricated
**
Head Nut
SIZE
Nm
lb/ft
Nm
lb/ft
Nm
lb/ft
Nm
lb/ft
Nm
lb/ft
Nm
lb/ft
Nm
lb/ft
Nm
lb/ft
5/8
UNF
136 100 102
75
203 150 149 110 285 210 217 160 231 170 251 185
5/8
UNC
149 110 115 85 231 170 176 130 325 240 244 180 258 190 278 205
3/4
UNF
237 175 176 130 353 260 271 200 515 380 380 280 359 265 393 290
3/4
UNC
271 200 190 140 407 300 298 220 570 420 420 310 447 330 481 355
7/8
UNF
231 170 170 125 583 430 434 320 814 600 610 450 644 475 685 505
7/8
UNC
244 180 190 140 637 470 475 350 909 670 678 500 705 520 793 585
1
UNF
339 250 258 190 868 640 651 480 1234 910 922 680 746 550 1051
775
1
UNC
380 280 285 210 976 720 732 540 1383 1020 1031 760 949 700 1220 900
1-1/8
UNF
475 350 366 270 1071 790 800 590 1749 1290 1315 970 1390 1025 1559 1150
1-1/8
UNC
542 400 407 300 1207 890 909 670 1953 1440 1464 1080 1559 1150 1797 1325
1-1/4
UNF
678 500 515 380 1519 1120 1139 840 2468 1820 1844 1360 1898 1400 2170 1600
1-1/4
UNC
746 550 570 420 1681 1240 1261 930 2726 2010 2048 1510 2170 1600 2373 1750
1-1/2
UNF
1180 870 881 650 2644 1950 1980 1460 4285 3160 3214 2370 3932 2900 4407 3250
1-1/2
UNC
1329 980 990 730 2983 2200 2224 1640 4827 3560 3621 2670 4475 3300 4949 3650
IMPORTANT: DO NOT use these values if a different torque value or tightening procedure is given for a specific
application. Torque values listed are for general use only. Check tightness of fasteners periodically. Shear bolts are
designed to fail under predetermined loads. Always replace shear bolts with identical grade.
NOTES
•
* - Grade 2 applies for hex caps (not hex bolts) up to 152 mm (6in) long. Grade 1 applies for hex cap screws
over 152 mm (6in) long, and for all other types of bolts and screws of any length.
•
** - "Lubricated" means coated with a lubricant such as engine oil, or fasters with phosphate and oil coatings.
"Dry" means plaind or zinc plated without any lubriation.
TORQUE SPECIFICATIONS - METRIC HARDWAR E
GRADE 8.8 Bolts, Nuts and Studs GRADE 10.9 Bolts, Nuts and Studs
Dry Dry
SIZE
Nm
lb/in lb/ft
Nm
lb/in lb/ft
M4 3to4 31to35 5to6 44to49
M5 5to6 49to55 8to9 71to79
M6 10 to 11 84 to 94 14 to 15 120 to 136
M8 23 to 26 229 to 2
77
33 to 37 293 to 3
29
M10 46to51 408to460 65to74 48to54
M12 80to90 59to66 114to128 85to94
M14 128 to 1
45
94 to 10
6
183 to 2
05
136 to 1
53
M16 200 to 220 149 to 161 285 to 320 208 to 235
6-75491 1 04/05/2005
8
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