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PT threaded pilot hole diameter
Straight holes are recommended for pilot holes.
If you want to increase the pilot hole diameter when tapping PT screws than the catalog value, consider that the allowable range is up to +0.3 mm from the catalog recommended value for nomi
What is the processing depth of tapered taps for pipes?
The number of reference diameter positions in the catalog is a guide to the machining depth.
Example: Processing depth of tapered taps for pipes PT3/8
Tapered tap TPT for pipes (long thread type) The machining depth for machining PT3/8 threads is 21 mm.
Tapered Taps for Pipes S-TPT
