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.

  • 互联网摘选 2025-01-18 12:15:16

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