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:

Whitworth - British Standard - Taps

British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard. British Standard Pipe thread defined by the ISO 228 standard (formerly BS-2779) uses Whitworth threads.

Size Taps
(inches)
Thread
(inches)
Drill
(inches)
1/8 28 5/16
1/4 19 27/64
3/8 19 9/16
1/2 14 11/16
5/8 14 25/32
3/4 14 29/32
7/8 14 1 1/16
1 11 1 1/8
1 1/4 11 1 1/2
1 1/2 11 1 15/32
1 3/4 11 1 25/32
2 11 2 5/32
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
  • 1 inch = 25.4 mm

Briggs - American Standard - Taps

In the US, standard pipe threads for commonly used sizes of pipe for water, gas, or steam are formerly called Briggs standard pipe threads.

Size Taps
(inches)
Thread
(inches)
Drill
(inches)
1/8 27 11/32
1/4 18 7/16
3/8 18 19/32
1/2 14 23/32
3/4 14 15/16
1 11 1/2 1 5/32
1 1/4 11 1/2 1 1/2
1 1/2 11 1/2 1 23/32
2 11 1/2 2 3/16
2 1/2 8 2 5/8
3 8 3 1/4
3 1/2 8 3 3/4
4 8 4 1/4

Related Topics

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

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