Drills & Holes
Drill bit size, tap drill, clearance hole and pilot hole size charts.
Drills & Holes charts
Clearance Hole Chart: Metric & Imperial Drill Size Table (Free PDF)
ISO 273 metric and ASME B18.2.8 inch clearance holes with counterbore and countersink sizes for socket head cap screws.
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Drill Bit Size Chart: Fractional, Number, Letter and Metric Table (Free PDF)
Fractional, number, letter and metric drill sizes with exact decimal inch and mm equivalents.
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Pilot Hole Size Chart: Wood & Metal Screw Table (Free PDF)
Pilot hole drill sizes for wood, lag and self-tapping screws in one place.
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Tap Drill Chart: Metric, UNC, UNF and Pipe Thread Sizes Table (Free PDF)
Which drill to use before tapping any thread: metric, unified, pipe and forming taps in seven complete tables.
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