Chrome-plated linear flexible shaft can be directly used for precision piston rods and some self-lubricating bearings due to its thick chrome plating layer. Due to its moderate hardness, it is used in many fields. Material: 45# or 40Cr or 2Cr13; Hardness: HB220-260; Hardened layer depth: 0.8-3mm; Straightness: 0.15mm/1000mm or less; Chrome plating layer thickness: 0.02-0.05mm