Hardware Identification & Torque Specifications
Common Hardware Types
Hex Head Capscrew | Washer |
| Lockwasher |
Carriage Bolt |
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| Hex Nut |
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.
0 |
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1/4 | Nut, 1/2” | |
1/2 | Inside | |
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3/4 | ||
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1 |
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1/4 |
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1/2 |
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3/4 | Screw, 1/2 x 2 | |
2 | Body | |
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1/4 | Diameter | |
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1/2 | Body | |
Length | ||
3/4 | ||
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3 |
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1/4 |
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1/2 |
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3/4 |
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4 |
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Torque Specification Chart
FOR STANDARD MACHINE HARDWARE (Tolerance ± 20%)
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Marks |
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Grade |
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SAE Grade 2 | SAE Grade 5 | SAE Grade 8 | ||||||||
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Size Of | in/lbs |
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Hardware | ft/lbs |
| Nm. | ft/lbs |
| Nm. | ft/lbs |
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19 |
| 2.1 | 30 | 3.4 | 41 | 4.6 | ||||
20 |
| 2.3 | 31 | 3.5 | 43 | 4.9 | ||||
27 |
| 3.1 | 43 | 4.9 | 60 | 6.8 | ||||
31 |
| 3.5 | 49 | 5.5 | 68 | 7.7 | ||||
66 |
| 7.6 | 8 | 10.9 | 12 | 16.3 | ||||
76 |
| 8.6 | 10 | 13.6 | 14 | 19.0 | ||||
11 |
| 15.0 | 17 | 23.1 | 25 | 34.0 | ||||
12 |
| 16.3 | 19 | 25.8 | 27 | 34.0 | ||||
20 |
| 27.2 | 30 | 40.8 | 45 | 61.2 | ||||
23 |
| 31.3 | 35 | 47.6 | 50 | 68.0 | ||||
30 |
| 40.8 | 50 | 68.0 | 70 | 95.2 | ||||
35 |
| 47.6 | 55 | 74.8 | 80 | 108.8 | ||||
50 |
| 68.0 | 75 | 102.0 | 110 | 149.6 | ||||
55 |
| 74.8 | 90 | 122.4 | 120 | 163.2 | ||||
65 |
| 88.4 | 110 | 149.6 | 150 | 204.0 | ||||
75 |
| 102.0 | 120 | 163.2 | 170 | 231.2 | ||||
90 |
| 122.4 | 150 | 204.0 | 220 | 299.2 | ||||
100 |
| 136 | 180 | 244.8 | 240 | 326.4 | ||||
160 |
| 217.6 | 260 | 353.6 | 386 | 525.0 | ||||
180 |
| 244.8 | 300 | 408.0 | 420 | 571.2 | ||||
140 |
| 190.4 | 400 | 544.0 | 600 | 816.0 | ||||
155 |
| 210.8 | 440 | 598.4 | 660 | 897.6 | ||||
220 |
| 299.2 | 580 | 788.8 | 900 | 1,244.0 | ||||
240 |
| 326.4 | 640 | 870.4 | 1,000 | 1,360.0 | ||||
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NOTES
1.These torque values are to be used for all hardware excluding: locknuts,
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.
Wrench & Fastener Size Guide
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| 7/16 | 1/2 | |
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| 3/8 | DIA. | ||
1/4 | 5/16 | DIA. | |||
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1/4” Bolt or Nut | 5/16” Bolt or Nut | 3/8” Bolt or Nut | 7/16” Bolt or Nut | 1/2” Bolt or Nut | |
Wrench | |||||
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| Wrench |
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PTS - 6