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
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
11/8
UNF
475
350
366
270
1071 790
800
590
1749 1290 1315 970
1390 1025 1559 1150
11/8
UNC
542
400
407
300
1207 890
909
670
1953 1440 1464 1080 1559 1150 1797 1325
11/4
UNF
678
500
515
380
1519 1120 1139 840
2468 1820 1844 1360 1898 1400 2170 1600
11/4
UNC
746
550
570
420
1681 1240 1261 930
2726 2010 2048 1510 2170 1600 2373 1750
11/2
UNF
1180 870
881
650
2644 1950 1980 1460 4285 3160 3214 2370 3932 2900 4407 3250
11/2
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
(
6 in
) long. Grade 1 applies for hex cap screws
over
152 mm
(
6 in
) 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 HARDWARE
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
3 to 4
31 to 35
5 to 6
44 to 49
M5
5 to 6
49 to 55
8 to 9
71 to 79
M6
10 to 11
84 to 94
14 to 15
120 to 136
M8
23 to 26
229 to 277
33 to 37
293 to 329
M10
46 to 51
408 to 460
65 to 74
48 to 54
M12
80 to 90
59 to 66
114 to 128
85 to 94
M14
128 to 145
94 to 106
183 to 205
136 to 153
M16
200 to 220
149 to 161
285 to 320
208 to 235
M20
400 to 450
293 to 330
555 to 620
406 to 460
M24
690 to 780
510 to 575
955 to 1075
705 to 790
87630288 1 6/6/2007
8
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