Screwing Taps:



High Speed Steel Hand Taps - BSW and BSF Ground Thread


 

BSW Form


Nominal Diameter

Threads per Inch

Thread Length

Overall Length

1/8 40 11 48
3/16 24 16 58
5/4 20 19 66
5/16 18 22 72
3/8 16 24 80
7/16 14 25 85
1/2 12 29 89
9/16 12 30 95
5/8 11 32 102
11/16 11 37 112
3/2 10 37 112
7/8 9 38 118
1 8 45 130
1.1/8 7 48 138
1.1/4 7 51 151
1.3/8 6 57 151
1.1/2 6 60 170
1.3/4 5 67 187
2 4.1/2 70 200
2.1/4 4 76 221
2.1/2 4 79 224
2.3/4 3.1/2 79 234
3 3.12 83 258


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 3.


BSF Form


Nominal Diameter

Threads per Inch

Thread Length

Overall Length

3/16 32 16 58
1/4 26 19 66
5/16 22 22 72
3/8 20 24 80
7/16 18 25 85
1/2 16 29 89
9/16 16 30 95
5/8 14 32 102
11/16 14 37 112
3/4 12 37 112
7/8 11 38 118
1 10 45 130
1.1/8 9 48 138
1.1/4 9 51 151
1.3/8 8 57 162
1.1/2 8 60 170
1.5/8 8 60 170
1.3/4 7 67 187
2 7 70 200
2.1/4 6 76 221
2.1/4 6 79 224
2.1/4 6 79 234
3 5 83 258


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 3.

 


 
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