Hollow Bar/ Hollow Chromed Bar/ Hollow Rod/ Hollow Piston Rod
Grade: CK45/ S45/ SAE 1045, EN8D, ST 52, SAE4140, 16Mn, 20Mn, E355, SAE1020
Metric OD Size: 6 mm to 1000 mm Inch OD Size: 2" to 20" .
Chrome Thickness: 20 TO 40 Micron ( or according to customer' s request)
Surface Roughness: Ra < 0.4 Micron
STRAIGHTNESS: < 0.2 mm/ m