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The products use 38CrMoAlA material, the surface hardness after hardening HV≥ 920. Finish machining and Nitriding, Nitrded case depth: 0.5-0.8mm. The design of this screw is suitable for SPC production. Whole inner hole of barrel (except feeding part) use 6-8mm SKD bushing. This material can solve the wearing problem and can increase  the working life so that save the cost of customers.

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