spring pin 1.Material : spring steel 2.Finish:black 3. HRC:42-50 Spring pin , roll pin, pinMaterial : spring steel 65Mn , stainless steel HRC42-50 HV=300Finish: black I can supply DIN1481, GB879.1, DIN7346I also follow custom requried size DIN1481 stainless steel M2.5*2mm--M12*60mm spring pin