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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 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 (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
Body
Length
Wrench & Fastener Size Guide
1/4
1/4" Bolt or Nut
5/16" Bolt or Nut
Wrench—7/16"
Washer
Lockwasher
Hex Nut
Nut, 1/2"
Inside
Diameter
5/16
3/8" Bolt or Nut
Wrench—1/2"
Wrench—9/16"
P P TS - 36
Torque Specification Chart
FOR STANDARD MACHINE HARDWARE (Tolerance ± 20%)
No
Hardware
Marks
Grade
SAE Grade 2
Size Of
in/lbs
Hardware
ft/lbs
Nm.
19
8-32
2.1
8-36
20
2.3
10-24
27
3.1
31
10-32
3.5
1/4-20
66
7.6
1/4-28
76
8.6
5/16-18
11
15.0
5/16-24
12
16.3
3/8-16
20
27.2
3/8-24
23
31.3
7/16-14
30
40.8
7/16-20
35
47.6
1/2-13
50
68.0
1/2-20
55
74.8
9/16-12
65
88.4
9/16-18
75
102.0
5/8-11
90
122.4
5/8-18
100
136
3/4-10
160
217.6
3/4-16
180
244.8
7/8-9
140
190.4
7/8-14
155
210.8
1-8
220
299.2
1-12
240
326.4
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.
7/16
3/8
DIA.
7/16" Bolt or Nut
Wrench (Bolt)—5/8"
Wrench (Nut)—11/16"
SAE Grade 5
SAE Grade 8
in/lbs
in/lbs
ft/lbs
Nm.
ft/lbs
Nm.
30
41
3.4
31
3.5
43
43
4.9
60
49
68
5.5
8
10.9
12
16.3
10
13.6
14
19.0
17
23.1
25
34.0
19
25.8
27
34.0
30
40.8
45
61.2
35
47.6
50
68.0
50
68.0
70
95.2
55
74.8
80
108.8
75
102.0
110
149.6
90
122.4
120
163.2
110
149.6
150
204.0
120
163.2
170
231.2
150
204.0
220
299.2
180
244.8
240
326.4
260
353.6
386
525.0
300
408.0
420
571.2
400
544.0
600
816.0
440
598.4
660
897.6
580
788.8
900
1,244.0
640
870.4
1,000
1,360.0
NOTES
1/2
DIA.
1/2" Bolt or Nut
Wrench—3/4"
4.6
4.9
6.8
7.7
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