国产中文字幕手机视频_亚洲性无码av在线欣赏网_久久96热在国产精品10_人妻无码视频一区二

Product features

1. Material: 38CrMoAlA

Nitriding treatment: Surface hardness: HV≥900

Nitriding depth: 0.5-0.8mm


2, material: special stainless steel,

Quenched, hard HRC55-58, suitable for all kinds of transparent and corrosive materials, improve the life of screw.


3, material: surface tungsten carbide ultra sound overall spray welding, improve the wear resistance of screw.



Screw head - Screw head

1. Material: 38CrMoAlA

Nitriding treatment: Surface hardness: HV≥900

Nitriding depth: 0.5-0.8mm


2, material: special stainless steel,

Quenched, hard HRC55-58, suitable for all kinds of transparent and corrosive materials, improve the life of screw.


3, material: surface tungsten carbide ultra sound overall spray welding, improve the wear resistance of screw.


Series of other products