Hardware Identification & Torque Specifications
Common Hardware Types
Hex Head Capscrew | Washer |
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| 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.
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1/4 | Nut, 1/2” | |
1/2 | Inside | |
Diameter | ||
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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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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| Grade | 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 |
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| 20 |
| 2.3 | 31 | 3.5 |
| 43 | 4.9 |
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| 27 |
| 3.1 | 43 | 4.9 |
| 60 | 6.8 |
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| 31 |
| 3.5 | 49 | 5.5 |
| 68 |
| 7.7 |
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| 66 |
| 7.6 | 8 | 10.9 |
| 12 | 16.3 |
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| 76 |
| 8.6 | 10 | 13.6 |
| 14 | 19.0 |
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| 15.0 | 17 | 23.1 |
| 25 | 34.0 |
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| 11 |
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| 12 |
| 16.3 | 19 | 25.8 |
| 27 | 34.0 |
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| 20 |
| 27.2 | 30 | 40.8 |
| 45 | 61.2 |
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| 23 |
| 31.3 | 35 | 47.6 |
| 50 | 68.0 |
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| 30 |
| 40.8 | 50 | 68.0 |
| 70 | 95.2 |
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| 35 |
| 47.6 | 55 | 74.8 |
| 80 | 108.8 |
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| 50 |
| 68.0 | 75 | 102.0 |
| 110 | 149.6 |
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| 55 |
| 74.8 | 90 | 122.4 |
| 120 | 163.2 |
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| 65 |
| 88.4 | 110 | 149.6 |
| 150 | 204.0 |
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| 75 |
| 102.0 | 120 | 163.2 |
| 170 | 231.2 |
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| 90 |
| 122.4 | 150 | 204.0 |
| 220 | 299.2 |
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| 100 |
| 136 | 180 | 244.8 |
| 240 | 326.4 |
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| 160 |
| 217.6 | 260 | 353.6 |
| 386 | 525.0 |
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| 180 |
| 244.8 | 300 | 408.0 |
| 420 | 571.2 |
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| 140 |
| 190.4 | 400 | 544.0 |
| 600 | 816.0 |
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| 155 |
| 210.8 | 440 | 598.4 |
| 660 | 897.6 |
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| 220 |
| 299.2 | 580 | 788.8 |
| 900 | 1,244.0 |
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| 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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