Appendix D Common Hardware Identification
Screw/Bolts/Studs
Head Styles
Hex Head or Machine Head
Hex Head or Machine Head with Washer
Flat Head (FHM)
Round Head (RHM)
Pan Head
Hex Socket Head Cap or Allent Head Cap
Hex Socket Head or Allent Head Shoulder Bolt
Sheet Metal Screw
Stud
Drive Styles
Hex
Hex and Slotted
Phillipsr
Slotted
Hex Socket
Nuts |
Nut Styles |
Hex Head |
Lock or Elastic |
Square |
Cap or Acorn |
Wing |
Washers |
Washer Styles |
Plain |
Split Lock or Spring |
Spring or Wave |
External Tooth Lock |
Internal Tooth Lock |
Hardness Grades |
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American Standard |
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Grade 2 |
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Grade 5 |
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Grade 8 |
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Grade 8/9 (Hex Socket |
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Head) |
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Metric |
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Number stamped on | 5.8 | |
hardware; 5.8 shown | ||
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Allent head screw is a trademark of
Phillipsr screw is a registered trademark of Phillips Screw Company.
Sample Dimensions
American Standard (Screws, Bolts, Studs, and Nuts) | Plain Washers | ||||||||||||||||
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| Major Thread Diameter In Fractional Inches Or Screw Number Size |
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Metric (Screws, Bolts, Studs, and Nuts) | Lock Washers | ||||||||||||||||
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| Length In Millimeters (Screws and Bolts) | 5/8 |
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| Distance Between Threads In Millimeters |
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| Major Thread Diameter In Millimeters |
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Appendix 59 |