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No.3-56 UNF SERIAL HAND TAP SET
VÖLKEL-1636981910
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Description
No.3-56 UNF 2 Piece serial hand tap 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 material resulting in an extremely smooth and accurate thread.
Tapping takes less effort because the full thread is cut in 2-3 passes.
Reduced tap breakage due to reduced load.
Easier to start straight because the roughing tap is a lot smaller, as well as tapered.
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