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滑轮材质:轴承使用的是高质量碳钢,热处理硬度HRC55-60度(表面硬度)
滚动经过高精度磨床加工,旋转灵活,如停滞感。
塑料材质POM,注塑加工后经过车加工。是滑轮表面光滑,无合模印,圆度好,同心度好。