精品欧洲av无码一区二区三区,高潮又爽又无遮挡又免费,欧美最猛黑人xxxxx猛交,亚洲熟妇色自偷自拍另类

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.


Injection screw - Screw barrel of injection molding machine

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.