in/lbs
ft/lbs
3
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
2
1
1/4
3/4
1/2
1/4
3/4
1/2
1/4
3/4
1/2
4
90
100
70
80
50
60
30
40
0
10
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
