... ChinaSpecial Machining for Shaft. Feature: Material: CK45,GCR15,stainless steel Hardness: HRC62 Precision: g6 Roughness: less than 1.5mm (Rmax) Hard ... in Industrial automatic machine, such as Industrial Robot, Automatic Recording instrument, Computer, Precision Printers and so on. Optical axis can also ... . Any question, pls feel free to tell us. 6MM SF6 hardness Cylinder linear shaft Made in China