What are Incremental (Serial) Taps?

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Cutting Taps Metric ThreadsUnified ThreadsWhitworth Threads Helical Coil Wire Screw Thread InsertsPipe ThreadsSpecial Threads Trouble ShootingStandard (Screw Threads, Center Holes)How to useSpecification of toolsBasic Knowledge

I need to carry out tapping for M30 and larger sizes, but because the workpiece is so big, it can’t be set on the machine, so I have to tap by hand. I've heard that using Incremental (Serial) taps make the process easier. Could you explain what incremental taps are?

For hand tapping with large-diameter taps, there is a method that allows the work to be done “Easily,” “Accurately,” and “Stably” - the incremental taps. The incremental taps divide the thread cutting into three stages, so that tapping can be completed with less than half the usual tapping torque.

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