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The fully hardened screws’ raw materials are made in China or imported from Japan, United States, Switzerland, Sweden, Germany. We select them highest quality materials for different working conditions.

Our self-developed vacuum sintered-nickel-based alloy coated screws (SST700 series) are suitable for high abrasion materials.

PVD coating and HVOF supersonic flame spraying are applied as surface treatment, which greatly improves the performance and life time of the screws.



SST500 series material is imported powder metallurgy high speed steel.

Heat treatment: vacuum quenching (preheating temperature: 600-700°C), austenitizing temperature 1000-1024°C, tempering temperature 530-580°C.

Overall hardness: 60-64HRC

Characteristics: super abrasion resistance, very good toughness, overall hardenability, stable heat treatment size.

Applications: engineering plastics +50% GF+ ordinary fire retardant, carbon fiber, ceramics, metal powder, magnetic powder and other high abrasion materials.



SST600 series materials are made of domestic and imported nickel-based alloy steel.

Heat treatment: vacuum quenching, alloy thermoplastic strain temperature 900-1140°C, tempering temperature 500-650°C.

Overall hardness: 55-58HRC.

Characteristics: super abrasion-resistant, super corrosion-resistant, high temperature resistant, good plasticity, suitable for halogen-free engineering plastics +65% GF high temperature working conditions.

Applications: PPS Halogen Free + 50% GF, PA9T Halogen Free + 50% GF, PA5T Halogen Free + 50% GF, PA66 Halogen Free + 65% GF, LCP Halogen Free, PPT Halogen Free + 50% GF, PEEK, Fluoroplastic and many more.


SST700 series is vacuum sintered - nickel based alloy coated screw.

The base material is made of 4140 alloy structural steel, the alloy powder is selected from the United States Wall Colmonoy Corporation nickel base alloy.

Alloy layer thickness: 0.8-1mm

Production range: less than 2m in length.

Characteristics: excellent abrasion and corrosion resistance, alloy layer and matrix metallurgical bonding, bonding strength 200Mpa.


SBK5 series is a nickel-based alloy barrel with vacuum sintering cladding process.

The base material is made of 4140 alloy structural steel and the alloy powder is selected from the United States Wall Colmonoy Corporation nickel base alloy.

Hardness: 56-60HRC.

Production range: inner diameter Ø14- Ø130

Characteristics: superior abrasion and corrosion resistance, high temperature resistance.

Applications: suitable for halogen-free plastics, high-fiber, carbon fiber, mineral fiber, ceramics, magnetic powder, metal powder and many more.