This thread form was developed by Sir Joseph Whitworth in 1841. The thread form has rounded roots and crests and is specified in BS84:1956.The thread angle for BSW is 55degrees as opposed to 60 degrees in Metric and Unified threads.


TAPER TAPS have a lead of eight threads and are used as a starting tap in difficult or high precision holes.

INTERMEDIATE TAPS have a lead of four threads and are used in most general purpose applications to cut a thread true to a pre-drilled pilot hole.

BOTTOMING TAPS have a lead of two threads and are used to ensure minimum thread run-out when tapping to the bottom of a blind hole.

Bottoming Taps are typically preceded by the use of a Taper or Intermediate Tap.

Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use.



Brand Bordo
Part no. Diameter (inch) Pitch (tpi) Overall Length (mm) Tapping Drill (mm) Pack Quantity
3028-3/32TS 3/32 48 Whit 44.5 1.9 1
3028-1/8TS 1/8 40 48 2.5 1
3028-5/32TS 5/32 32 Whit 53 3.2 1
3028-3/16TS 3/16 24 58 3.7 1
3028-7/32TS 7/32 24 Whit 62 4.5 1
3028-1/4TS 1/4 20 66 5.1 1
3028-5/16TS 5/16 18 72 6.5 1
3028-3/8TS 3/8 16 80 7.9 1
3028-7/16TS 7/16 14 85 9.5 1
3028-1/2TS 1/2 12 89 10.5 1
3028-9/16TS 9/16 12 95 12.2 1
3028-5/8TS 5/8 11 102 13.5 1
3028-3/4TS 3/4 10 112 16.5 1
3028-7/8TS 7/8 9 118 19.5 1
3028-1TS 1 8 130 22 1
3028-1.1/8TS 1-1/8 7 138 25 1
3028-1.1/4TS 1-1/4 7 151 28 1
3028-1.3/8TS 1-3/8 6 162 30.5 1
3028-1.1/2TS 1-1/2 6 170 33.5 1
3028-1.3/4TS 1-3/4 5 187 39 1
3028-2TS 2 4.5 200 44.5 1

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