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Sizes







Screw Size Decimal 
Equiv. 
(Inches)		 Hex Key Size (Inches) Head Height (Inches) Head Diameter (Inches)
No. 0
 0.060 0.05 0.060 0.096
No. 1
 0.073 1/16 0.073 0.118
No. 2
 0.086 5/64 0.086 0.140
No. 3
 0.099 5/64 0.099 0.161
No. 4
 0.112 3/32 0.112 0.183
No. 5
 0.125 3/32 0.125 0.205
No. 6
 0.138 7/64 0.138 0.226
No. 8
 0.164 9/64 0.164 0.270
No. 10
 0.190 5/32 0.190 0.312
No. 12
 0.216 ??? 0.216 ???
1/4" 0.250 3/16 1/4 3/8
5/16" 0.313 1/4 5/16 15/32
3/8" 0.375 5/16 3/8 9/16
7/16" 0.438 3/8 7/16 21/32
1/2" 0.500 3/8 1/2 3/4
5/8" 0.625 1/2 5/8 15/16
3/4" 0.750 5/8 3/4 1 1/8
7/8" 0.875 3/4 7/8 1 5/16
1" 1.000 3/4 1 1 1/2
1 1/8" 1.125 7/8 1 1/8 1 11/16



Releated References:
Screw Thread Limits Table
UNC UNF Threads Per Inch TPI Threads Per Inch
Wood Screw Pilot Hole Sizes Table
Standard NPT National Pipe Thread Tap Drill Sizes Table
ASTM ISO Metric Thread Sizes and Tap Drill Table
Metric Thread Size Tap Drill Table
Standard Tap Drills Clearance Holes Table
Standard Drill Sizes Decimal Equivalents Table
Socket Head Cap Screw Sizes Dimension Table
SAE Grade ASTM Bolt Identify Marks Mechanical Properties
Steel Bolt Torque Specifications Table
Finished Hex Nut Dimensions
Heavy Hex Nut Dimensions Table
Standard ANSI Type B Flat Washer Sizes

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