... PLATED BAR, CHROMATE TREATED BAR. They are commonly used in the machine production as bearing. CARBON STEEL BAR, CHROME PLATED ... BAR, CHROMATE TREATED BAR.They are commonly used in the machine production as bearing.DIAMETER:Φ20~Φ80mm;STRAIGHTNESS:±0.15mm ... solid bar and chrome plated bar are widely used in the fields of machine production, electronic equipment, chemical industry, medicine, ...