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Torque Specification Chart
FOR STANDARD METRIC MACHINE HARDWARE (Tolerance ± 20%)
Property
Class
Class 8.8
Class 10.9
Class 12.9
Size Of
Hardware
Nm. Nm. Nm.
Nm.
M3
1.28
2.90
5.75
9.9
16.5
24
48
83
132
200
275
390
530
375
995
1350
1830
2360
3050
13.44 1.80
4.10
8.10
14
23
34
67
117
185
285
390
550
745
960
1400
1900
2580
3310
4290
19.2 22.92
2.15
M4
30.72 43.44 52.56
4.95
M5
60.96
5.97 7.15
16.5
9.7
M6 7.3 10.3 12.1
M7 12.1 16.9 19.9
27
M8 17.7
25
29
40
M10 35 50
59
81
M12 61 86.2 103 140
M14
101
136 162 220
M16 147 210 250 340
M18 202 287 346 470
M20 290 405 486 660
M22 390 559 656 890
M24 497
708
840 1140
M27 733 1032 1239 1680
M30 995 1401 1681 2280
M33
1349
1902 2278 3090
M36 1740 2441
3798
2935 3980
M39 2249 3163
Torque Specification Chart
FOR STANDARD MACHINE HARDWARE (Tolerance ± 20%)
Hardware
Grade
SAE Grade 2 SAE Grade 5 SAE Grade 8
Size Of
in/lbs
ft/lbs
in/lbs
ft/lbs
in/lbs
ft/lbs
in/lbs in/lbs
Hardware ft/lbs Nm. ft/lbs Nm. ft/lbs Nm.
8-32
19
2.1
30
3.4
41
4.6
8-36
20
2.3
31
3.5
43
4.9
10-24
27
3.1
43
4.9
60
6.8
10-32
31
3.5
49
5.5
68
7.7
1/4-20
66
7.6 8 10.9 12 16.3
1/4-28
76
8.6 10 13.6 14 19.0
5/16-18 11 15.0 17 23.1 25 34.0
5/16-24 12 16.3 19 25.8 29 34.0
3/8-16 20 27.2 30 40.8 45 61.2
3/8-24 23 31.3 35 47.6 50 68.0
7/16-14 30 40.8 50 68.0 70 95.2
7/16-20 35 47.6 55 74.8 80 108.8
1/2-13 50 68.0 75 102.0 110 149.6
1/2-20 55 74.8 90 122.4 120 163.2
9/16-12 65 88.4 110 149.6 150 204.0
9/16-18 75 102.0 120 163.2 170 231.2
5/8-11 90 122.4 150 204.0 220 299.2
5/8-18 100 136 180 244.8 240 326.4
3/4-10 160 217.6 260 353.6 386 525.0
3/4-16 180 244.8 300 408.0 420 571.2
7/8-9 140 190.4 400 544.0 600 816.0
7/8-14 155 210.8 440 598.4 660 897.6
1-8 220 299.2 580 788.8 900 1,244.0
1-12 240 326.4 640 870.4 1,000 1,360.0
Hex Head Capscrew
Hex Nut
Lockwasher
Washer
Carriage Bolt
NOTES
1. These torque values are to be used for all hardware
excluding: locknuts, self-tapping screws, thread forming
screws, sheet metal screws and socket head setscrews.
2. Recommended seating torque values for locknuts:
a. for prevailing torque locknuts - use 65% of grade 5
torques.
b. for flange whizlock nuts and screws - use 135% of
grade 5 torques.
3. Unless otherwise noted on assembly drawings, all torque
values must meet this specification.
Hardware Identification & Torque Specifications
Common Hardware Types
No
Marks
The guides and ruler furnished below are designed to
help you select the appropriate hardware.
8.8
10.9
12.9
Class 5.6
5.6
5150
13.44
1.28
5.88
26.4
2.50
44.64
4.3
5.2
7.1
7.7
10.5
15
21
988
1340
759
1030
590
800
435
590
320
435
217
295
169
230
126
171
89
121
64
88
42
58
26
36
.56
Thread
Diameter (mm)
Screw, 1/2- 16 x 2
Body
Diameter
Diameter
Inside
Diameter (in)
Nut, 1/2-16
0
1/4 3/4
1/2
21
1/4 3/4
1/2
1/4 3/4
1/2
1/4 3/4
1/2
4
90 10070
80
50
60
30
40
010
20
Thread
Diameter (mm)
Nut, M8
Screw, M8- 1.25 x 25
Distance between
threads (mm)
Body
Length (in)
Body
Length (mm)
3/8” Bolt or Nut
Wrench—9/16”
5/16” Bolt or Nut
Wrench—1/2”
1/4” Bolt or Nut
Wrench—7/16”
1/2” Bolt or Nut
Wrench—3/4”
7/16” Bolt or Nut
Wrench (Bolt)—5/8”
Wrench (Nut)—11/16”
in/lbs
Threads
per inch
Threads
per inch
Body Length
Body
When a washer or nut is identified as 1/2” (M8), this is
the
Nominal size
, meaning the
inside diameter
is 1/2 inch
(8mm metric thread diameter); if a second number is present
it represents the
threads per inch
(distance between threads).
When bolt or capscrew is identified as 1/2 - 16 x 2” (M8 - 1.25 x 50 ),
this means the
Nominal size
, or body diameter is 1/2 inch (8mm
metric thread diameter), the second number,16, represents the
threads per inch, (1.25 thread diameter).
The final number is the
body length of the bolt or screw, 2 inches (50mm).
Standard Hardware Sizing
M6 Bolt or Nut
Wrench—10mm
M8 Bolt or Nut
Wrench—13mm
M10 Bolt or Nut
Wrench—17mm
M12 Bolt or Nut
Wrench—19mm
M14 Bolt or Nut
Wrench—22 mm
Wrench & Fastener Size Guide