Ejector pin tolerance -0.01/-0.02 on main pin diameter (note: dimension not to be take within 30mm of the underside of the head) Head diameter tolerance +0.00/-0.02 x Head thickness +0.00/-0.05mm. Matl. = SKD61 = H13/Hardness = HV900 Surface, & HRC 42-47 Inside. t : 8mm. d : 25.0mm. l : 450mm. h : 30mm. Other sizes of pins and sleeves also available on indent. *Un-nitrided pins are from FDAC (=H11) material with a through hardness of 35-40 HRC, and so can be machined to desired shape, then nitrided without further heat treatment.