Make round precision percing punches per DIN9861D,DIN9861DA
Hardened: head =HRC 45±5(HWS,WS) HRC55±5(HSS) Body =HRC62± 2(HWS) HRC64±2(HSS)
hws=heavy duty tool steel(12% chrome),
hss= heavy duty high speed stee,
cpm10v=power metallurgy produced high speed steel
The punch shaft though accurately grinded and straightened, the head is
reprocessed after anneal. This way make the punch have good tolerance and stable quality.
at least 4 times salt-bathing make it has good hardness.
OD(outer diameter) we can make is from 0.5mm to 15. Length is 71,80 100,130mm
Surface coating: TIN,TIC,TIAL make surface hardness more than 1500HV-2000.