collar-hole punches

The punching and flanging punch-die and perforation punch may amount to a precision of 0.003mm,a roundness and coaxiality of 0.002mm,and a bending strength of 4400Mpa. The material HAP40 is uniform in itself.
Further subject to special heat treatment process, it will give the die significantly extended service life,about 20 million shots, more than that of like products made in Japan.