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Miscellaneous—Machine
DX,TORQ1 -19-30MAY18-1/1
Unied Inch Bolt and Screw Torque Values
TS1671 —UN—01MAY03
SAE Grade 1
a
SAE Grade 2
b
SAE Grade 5, 5.1 or 5.2 SAE Grade 8 or 8.2
Bolt or Screw
Size
Hex Head
c
Flange
Head
d
Hex Head
c
Flange
Head
d
Hex Head
c
Flange
Head
d
Hex Head
c
Flange
Head
d
N·m lb·in N·m lb·in N·m lb·in N·m lb·in N·m lb·in N·m lb·in N·m lb·in N·m lb·in
1/4
3.1 27.3 3.2 28.4 5.1 45.5 5.3 47.3 7.9 70.2 8.3 73.1 11.2 99.2 11.6 103
N·m lb·ft N·m lb·ft
5/16
6.1 54.1 6.5
57.7
10.2 90.2 10.9 96.2 15.7 139 16.8 149 22.2 16.4 23.7 17.5
N·m lb·ft N·m lb·ft
3/8
10.5 93.6 11.5 102 17.6 156 19.2 170 27.3 20.1 29.7 21.9 38.5 28.4 41.9 30.9
N·m lb·ft N·m lb·ft
7/16
16.7 148 18.4 163 27.8 20.5 30.6 22.6 43 31.7 47.3 34.9 60.6 44.7 66.8 49.3
N·m lb·ft N·m lb·ft
1/2
25.9 19.1 28.2 20.8 43.1 31.8 47 34.7 66.6 49.1 72.8 53.7 94 69.3 103 75.8
9/16
36.7 27.1 40.5 29.9 61.1 45.1 67.5 49.8 94.6 69.8 104
77
134 98.5 148 109
5/8
51 37.6 55.9 41.2 85 62.7 93.1 68.7 131 96.9 144 106 186 137 203 150
3/4
89.5 66 98 72.3 149 110 164 121 230 170 252 186 325 240 357 263
7/8
144 106 157 116 144 106 157 116 370 273 405 299 522 385 572 422
1 216 159 236 174 216 159 236 174 556 410 609 449 785 579 860 634
1-1/8
305 225 335 247 305 225 335 247 685 505 751 554 1110 819 1218 898
1-1/4
427 315 469 346 427 315 469 346 957 706 1051
775
1552 1145 1703 1256
1-3/8
564 416 618 456 564 416 618 456 1264 932 1386 1022 2050 1512 2248 1658
1-1/2
743 548 815 601 743 548 815 601 1665 1228 1826 1347 2699 1991 2962 2185
The nominal torque values listed are for general use only with the assumed
wrenching accuracy of 20%, such as a manual torque wrench.
DO NOT use these values if a different torque value or tightening procedure is
given for a specic application.
For lock nuts, for stainless steel fasteners, or for nuts on U-bolts, see the
tightening instructions for the specic application.
Replace fasteners with the same or higher property class. If
higher property class fasteners are used, tighten these to the
strength of the original.
•
Make sure that fastener threads are clean.
•
Apply a thin coat of Hy-Gard™ or equivalent oil under the head and on the threads of the fastener, as shown in the following image.
•
Be conservative with the amount of oil to reduce the potential for hydraulic lockup in blind holes due to excessive oil.
•
Properly start thread engagement.
TS1741 —UN—22MAY18
a
Grade 1 applies for hex cap screws over 6 in (152 mm) long, and for all other types of bolts and screws of any length.
b
Grade 2 applies for hex cap screws (not hex bolts) up to 6 in (152 mm) long.
c
Hex head column values are valid for ISO 4014 and ISO 4017 hex head, ISO 4162 hex socket head, and ISO 4032 hex nuts.
d
Hex ange column values are valid for ASME B18.2.3.9M, ISO 4161, or EN 1665 hex ange products.
4-1-19
112321
PN=279
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