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British Pipe Tap Drill Sizes<br />

Size<br />

BSPP<br />

Inches<br />

Tap Drill Sizes<br />

BSPP<br />

Metric<br />

BSPT<br />

Inches<br />

BSPT<br />

Metric<br />

1/8" 11/32" 8.8 21/64" 8.4<br />

1/4" 29/64" 11.8 7/16" 11.2<br />

3/8" 19/32" 15.25 37/64" 14.75<br />

1/2" 3/4" 19 23/32" 18.25<br />

5/8" 53/64" 21 15/16" 23.75<br />

3/4" 31/32" 24.5 1.11/64" 30<br />

7/8" 1.7/64" 28.25 1.33/64" 38.5<br />

1" 1.13/64" 30.75 1.3/4" 44.5<br />

1.1/4" 1.35/64" 39.5 2.3/16" 56<br />

1.1/2" 1.25/32" 45.5<br />

1.3/4" 2" 51<br />

2" 2.1/4" 57<br />

2.1/4" 63<br />

2.1/2" 72<br />

3" 85<br />

V 1.0 – November 2011 Page 109

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