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      1. EN  |   中文

        Twin metal cylinder screw.

        Double gold level: class A: containing 40% tungsten.

                         Class B: 20% tungsten

                         Class C: 95% tungsten

        Alloy hardness: HRC. 56-65 ℃


        Technical indicators:

        Depth of nitride: 0.5-0.8mm.

        Hardness of nitride: 950-1020Hv.

        Brittleness of nitrogen: less than or equal to one.

        Surface roughness: Ra0.4um.

        Screw straightness: 0.015mm.

        Double alloy hardness: hrc55-62.

        Double alloy depth:>2mm