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Hardware Identification & Torque Specifications
Common Hardware Types
Hex Head Capscrew
Carriage Bolt
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 represent the threads per inch
When bolt or cap-screw 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 (in this example 2 inches long).
The guides and ruler furnished below are designed to
help you select the appropriate hardware and tools.
Screw, 1/2 x 2
Body
Diameter
Wrench & Fastener Size Guide
1/4
1/4" Bolt or Nut
Wrench—7/16"
NOTE:
Self tapping screws are to have: 15-20 ft. lbs of torque when threaded into either 11ga or 3/16 steel.
Washer
Lockwasher
Hex Nut
Nut, 1/2"
Inside
Diameter
Body
Length
5/16
5/16" Bolt or Nut
3/8" Bolt or Nut
Wrench—1/2"
12-18 ft. lbs of torque when threaded into 14 gauge steel.
17
Torque Specification Chart
FOR STANDARD MACHINE HARDWARE (Tolerance ± 20%)
No
Hardware
Marks
Grade
SAE Grade 2
Size Of
in/lbs
Hardware
ft/lbs
8-32
19
8-36
20
10-24
27
10-32
31
1/4-20
66
1/4-28
76
5/16-18
11
5/16-24
12
3/8-16
20
23
3/8-24
7/16-14
30
7/16-20
35
1/2-13
50
1/2-20
55
9/16-12
65
75
9/16-18
5/8-11
90
5/8-18
100
160
3/4-10
3/4-16
180
7/8-9
140
7/8-14
155
1-8
220
1-12
240
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 whiz-lock nuts and screws - use 135%
of grade 5 torques.
3. Unless otherwise noted on assembly drawings, all torque
values must meet this specification.
3/8
7/16" Bolt or Nut
Wrench (Bolt)—5/8"
Wrench—9/16"
Wrench (Nut)—11/16"
SAE Grade 5
in/lbs
in/lbs
Nm.
ft/lbs
Nm.
ft/lbs
2.1
30
3.4
2.3
31
3.5
3.1
43
4.9
3.5
49
5.5
7.6
8
10.9
8.6
10
13.6
15.0
17
23.1
16.3
19
25.8
27.2
30
40.8
35
31.3
47.6
40.8
50
68.0
47.6
55
74.8
68.0
75
102.0
110
74.8
90
122.4
120
88.4
110
149.6
150
120
170
102.0
163.2
122.4
150
204.0
220
136
180
244.8
240
260
386
217.6
353.6
244.8
300
408.0
420
190.4
400
544.0
600
210.8
440
598.4
660
299.2
580
788.8
900
326.4
640
870.4
1,000
NOTES
1/2
7/16
DIA.
DIA.
1/2" Bolt or Nut
Wrench—3/4"
SAE Grade 8
Nm.
41
4.6
43
4.9
60
6.8
68
7.7
12
16.3
14
19.0
25
34.0
27
34.0
45
61.2
50
68.0
70
95.2
80
108.8
149.6
163.2
204.0
231.2
299.2
326.4
525.0
571.2
816.0
897.6
1,244.0
1,360.0
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