Bit & Thread The bit is always smaller than the thread.
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Which drill bit for that screw?

Pick a screw type, size and job. The page returns the drill diameter, the nearest imperial bit and the matching tap, bolt or wall plug.

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Drill Bit & Screw Size GuidePick the screw type, size and job to get the drill diameter, the nearest imperial bit, the tap drill and the clearance hole — with full charts for machine screws, wood screws and wall plugs.