Hard-chromed piston rod with micro-grooves, increasing the rigidity and reducing friction, keep better lubrication action.
Hard-chromed piston rod with micro-grooves, increasing the rigidity and reducing friction, keep better lubrication action.
活塞杆微裂纹镀硬铬，增因硬度减少磨擦，保持油膜润滑效果值。