Hard Ground Steel 100Cr6 (WS 1.3505 to HV550-65) to 55-62 HRC - DIN 6325 (ISO 8734)
Stocked in m6 diameter tolerance which is functionally interchangeable with the Grade 1 tolerance of the corresponding British Standard.
The product is in all cases through hardened to HRC 55-62 for maximum strength and toughness.
The metrial also can use stainless steel.