Torque Specification Chart
FOR STANDARD MACHINE HARDWARE (Tolerance ± 20%)
Hardware
Grade
SAE Grade 2
SAE Grade 5
SAE Grade 8
Size Of
in/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
27
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 torque.
b. For flange whizlock nuts and screws:
use 135% of Grade 5 torque.
3. Unless otherwise noted on assembly drawings,
all torque values must meet this specification.
Hardware Identification & Torque Specifications
Common Hardware Types
Screw, 1/2 x 2
Body
Diameter
Body
Length
Inside
Diameter
Nut, 1/2”
No
Marks
3/8” Bolt or Nut
Wrench—9/16”
3/8
5/16” Bolt or Nut
Wrench—1/2”
5/16
1/4” Bolt or Nut
Wrench—7/16”
1/4
1/2” Bolt or Nut
Wrench—3/4”
1/2
7/16
7/16” Bolt or Nut
Wrench (Bolt)—5/8”
Wrench (Nut)—11/16”
Wrench & Fastener Size Guide
Standard Hardware Sizing
When a washer or nut is identified as 1/2”, this is the
nominal size, meaning the inside diameter is 1/2 inch; if a
second number is present it represents the
threads per inch.
When a bolt or capscrew is identified as
1/2 - 16 x 2”
, this
means the
nominal size , or body diameter is 1/2 inch; the
second number represents the
threads per inch (16 in this
example), and the final number is the
body length of the
bolt or screw (2 inches long in this example).
The guides and ruler furnished below are designed to
help you select the appropriate hardware and tools.
0
1/4
3
/4
1/2
1
1/4
3
/4
1/2
2
1/4
3/4
1/2
3
1/4
3
/4
1/2
4
