Screwing Taps:

High Speed Steel Nut Taps - BSW and BSF

High Speed Steel
Nut Taps - BSW and BSF
Ground Threads


BSW - British Standard With worth - Coarse Threads Series

Nominal Daimeter

Threads Per Inch

Thread Length Overall Length
1/4 20 38 110
5/16 18 42 120
3/8 16 48 140
7/16 14 55 160
1/2 12 64 180
9/16 12 64 200
5/8 11 70 200
3/4 10 76 250
7/8 9 85 280
1 8 95 280
1.1/8 7 109 315
1.1/4 7 109 355
1.1/2 6 127 400
1.3/4 5 153 500
2 4.1/2 170 560

Dimension in mm.

Specification Conform to BS 949 - 1969

These Taps are usually Supplied Thread Tolerance Zone 3.


BSF - British Standard Fine Thread Series

Nominal Daimeter

Threads Per Inch

Thread Length Overall Length
1/4 26 30 110
5/16 22 35 120
3/8 20 38 140
7/16 18 43 160
1/2 16 48 180
9/16 16 48 200
5/8 14 55 200
3/4 12 64 250
7/8 11 70 280
1 10 76 280
1.1/8 9 85 315
1.1/4 9 85 355
1.1/2 8 95 400
1.3/4 8 95 500
2 8 95 560


Dimension in mm.

Specification Conform to BS 949 - 1969

These Taps are usually Supplied in set of three - Taper, Second and Bottoming with Thread Tolerance Zone


 
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