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1" x 14 TPI UNF HSS SERIAL HAND TAP SET
Volkel-1636981125
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Description
1"-14 TPI UNF (UNS) HSS SERIAL HAND TAP 2 PIECE SET
Serial Tap sets are different to standard hand taps.
Designated as Rougher, Intermediate and Finisher, unlike conventional tap sets taper, second and bottom where the difference between each one is the length of the taper only.
Because the major and pitch diameter of the rougher is smaller than the intermediate, and the intermediate is smaller than the finisher, each tap removes a smaller volume of metal resulting in an extremely smooth and accurate thread.
Tapping takes less effort because the full thread is cut in 2 or 3 passes. Finer pitch threads can be cut with two taps.
Reduced tap breakage due to reduced load.
Easier to start straight because the first tap is smaller, as well as tapered.
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