Screwing Taps :

High Speed Steel Hand Taps - UNC and UNF Ground Thread


 

UNC - Unified Coarse Thread Series

Nominal Diameter

Threads per Inch

Thread Length

Overall Length

1/4 20 19 66
5/16 18 22 72
3/8 16 24 80
7/16 14 25 85
1/2 13 29 89
9/16 12 30 95
5/8 11 32 102
3/4 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 57 162
1.1/2 6 60 170
1.3/4 5 67 187
2 4.1/2 70 200
2.1/4 4.1/2 76 221
2.3/4 4 79 234
3 4 83 258


Dimension in mm / Inches

Specification Conform to BS : 949 - 1969

These Taps are usally Supplied in set of three - Taper, Second and Bottoming.

UNF - Unified Fine Thread Series

Nominal Diameter

Threads per Inch

Thread Length

Overall Length

1/4 28 19 66
5/16 24 19 69
3/8 24 20 76
7/16 20 22 82
1/2 20 24 84
9/16 8 25 90
5/8 18 25 95
3/4 16 29 104
4/8 14 33 113
1 12 35 120
1.1/8 12 37 127
1.1/4 12 37 17
1.3/8 12 39 144
1.1/2 12 39 149


Dimension in mm / Inches

Specification Conform to BS : 949 - 1969

These Taps are usally Supplied in set of three - Taper, Second and Bottoming.


 
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