Pipe Taps - Drill Sizes

Drill sizes for British Whitworth Standard and Briggs American Standard pipe taps

Drill sizes for Briggs - American Standard - and Whitworth - British Standard - pipe taps can be taken from the tables below.

Whitworth - British Standard - Taps

Size Taps
(inches)
Thread
(inches)
Drill
(inches)
1/8 28 5/16
1/4 19 7/16
3/8 19 9/16
1/2 14 23/32
5/8 14 25/32
3/4 14 29/32
7/8 14 1 1/16
1 11 1 5/32
1 1/4 11 1 1/2
1 1/2 11 1 23/32
1 3/4 11 1 31/32
2 11 2 3/16
2 1/4 11 2 13/32
2 1/2 11 2 25/32
2 3/4 11 3 1/32
3 11 3 9/32
3 1/4 11 3 1/2
3 1/2 11 3 3/4
3 3/4 11 4
4 11 4 1/4

Briggs - American Standard - Taps

Size Taps
(inches)
Thread
(inches)
Drill
(inches)
1/8 27 21/64
1/4 18 27/64
3/8 18 9/16
1/2 14 11/16
3/4 14 29/32
1 11 1/2 1 1/8
1 1/4 11 1/2 1 15/32
1 1/2 11 1/2 1 23/32
2 11 1/2 2 3/16
2 1/2 8 2 9/16
3 8 3 3/16
3 1/2 8 3 11/16
4 8 4 3/16

Related Topics

  • Dimensions - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more

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