... , machinery spare parts. Our manufacturing range rates within sizes of inner diameter from 10mm to 120mm, of thickness from 0.5mm ... to 18mm, of the precision ±0.03mm, and of inner surface roughness Ra0.4-0.6. The types of steel ... characteristics of small-sized, heavy-wall thickness, high precision, inner or outer special shaped profiles. They are widely adept in auto, hydraulic ...