DIN357 Machine Screw Nut Tapping Tap
DIN357 Nut taps are used to produce nuts with metric ISO standard threads according to DIN 13-1.
They have a very long lead ( 2/3 of the thread length) and are suitable for thread depths up to 1.5 x nominal diameter in short through holes.
The purpose of the nut taps with 2/3 lead is durability (long service life) due to good cutting distribution. The surface of the cut thread is also very smooth, which is very important for nuts that have to be loosened frequently.
The construction dimensions are regulated in the DIN standard 357 (for metric iso-thread from M3 to M 20)
long reduced shank to allow nuts to run over
for thread depth up to 1.5 x D
ideal for tapping holes where difficult to reach
for through threads
non-abrasive material up to 800 N/mm²
unalloyed and low alloyed steel
Type of thread: metric ISO-thread
Standard: DIN 357
Material: HSS or HSSE
Tolerance: ISO2 (6H)
Type of flute: straight fluted
Application: for through holes
Thread standard: DIN 13