Taps and drill sizes used for Whitworth - ISO 7 and ISO 228 threads. ; 1/2, 12, 27/64 (10.7) ; 5/8, 11, 17/32 (13.7) ; 3/4, 10, 21/32 (16.6) ; 7/8, 9, 49/64 (19.5).
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