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This tap and clearance drill chart shows tap and clearance drill sizes for standard threads. There is also a printable version that has both metric and inch threads.
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Clearance hole chart for inch bolts and screws. Drill size and hole diameter for normal, close and loose fit classes are tabulated.
Nominal Screw SizeFit Class - Normal(nominal Drill Size)Fit Class - Normal(hole Diameter)Fit Class - Normal(hole Diameter)#0#480.0760.082#1#430.0890.095#2#380.1020.108#3#320.1160.122Precision Sheet Metal Fabrication. Tap & Drill Chart: Screw/thread size, major and minor diameter, drill size, decimal equivalent. Tapped hole, close fit, and free fit clearance holes.
Screw SizeMajor DiameterMinor DiameterDrill Size1/4-320.25"0.2117"11/4-280.25"0.2062"112-320.216"0.1777"912-280.216"0.1722"10Apr 18, 2024 · The recommended drill hole size for a 10-32 screw is #21, which corresponds to a 0.159-inch diameter. This size allows for the thread to engage the material while providing enough clearance for the screw to pass through smoothly.
- 5/16"
- 21
- 3/32"
- 12
Here, you’ll find an extensive database of standard tapping drill sizes, alongside their corresponding clearance holes for metric and imperial units, tailored to facilitate the selection and use of screws and bolts in various applications.
Clearance hole calculator to find the recommended clearance hole sizes from #0 through 1.5 in for inch bolts, screws and studs in three classes of clearance using close-, normal- and loose-fit category.
Tap Drill Chart: Free Fit Clearance Hole, All Materials – Microform Precision. Screw Thread Size. Major Diameter. Minor Diameter.