Screw
Size |
Body Dia. |
Shank
Pilot Hole* |
Pilot Hole
in Softwood |
Pilot Hole
in Hardwood |
0 |
0.060 |
1/16 |
1/64 |
1/32 |
1 |
0.073 |
5/64 |
1/32 |
1/32 |
2 |
0.086 |
3/32 |
1/32 |
3/64 |
3 |
0.099 |
7/64 |
3/64 |
1/16 |
4 |
0.112 |
7/64 |
3/64 |
1/16 |
5 |
0.125 |
1/8 |
1/16 |
5/64 |
6 |
0.138 |
9/64 |
1/16 |
5/64 |
7 |
0.151 |
5/32 |
1/16 |
3/32 |
8 |
0.164 |
11/64 |
5/64 |
3/32 |
9 |
0.177 |
3/16 |
5/64 |
7/64 |
10 |
0.190 |
3/16 |
3/32 |
7/64 |
11 |
0.203 |
13/64 |
3/32 |
1/8 |
12 |
0.216 |
7/32 |
7/64 |
1/8 |
14 |
0.242 |
1/4 |
7/64 |
9/64 |
16 |
0.268 |
17/64 |
9/64 |
5/32 |
18 |
0.294 |
19/64 |
9/64 |
3/16 |
20 |
0.320 |
21/64 |
11/64 |
13/64 |
24 |
0.372 |
3/8 |
3/16 |
7/32 |
These dimensions are for standard American wood screws, which are tapered. They are not suitable for screws which are not tapered, such as dry wall screws. All dimensions are in inches.
The shank pilot hole is one which will clear the thickest part of the screw body.
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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