Screwing Tapes:


High Speed Steel Nut Taps - UNC and UNF


High Speed Steel
Nut Taps - UNC and UNF
Ground Threads


UNC - Unified Coarse Thread Series

Nominal Diameter Threads per inch Thread Length Overall Length
1/4 20 38 110
5/16 18 43 125
3/8 16 48 140
7/16 14 55 160
1/2 13 59 180
9/16 12 64 200
5/8 11 70 200
3/4 10 70 200
7/8 9 85 280
1 8 95 280
1.1/8 7 109 315
1.1/4 7 109 355
1.3/8 6 127 400
1.1/2 6 127 400
1.3/4 5 153 500
2 4.1/2 170 560


Dimension in mm / Inches

Specification Conform to BS : 949 - 1969

These Taps are usally Supplied in set of three - Taper, Lead of 2/3 Thread Length.


UNF - Unified Fine Thread Series


Nominal Diameter Threads per inch Thread Length Overall Length
1/4 28 28 110
5/16 24 32 125
3/8 24 32 140
7/16 20 38 160
1/2 20 38 180
9/16 8 43 200
5/8 18 43 200
3/4 16 48 250
4/8 14 55 280
1 12 64 280
1.1/8 12 64 315
1.1/4 12 64 355
1.3/8 12 64 400
1.1/2 12 64 400


Dimension in mm / Inches

Specification Conform to BS : 949 - 1969

These Taps are usally Supplied in set of three - Taper, Lead of 2/3 Thread Length

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