Technical parameter:

Diameter of screw: φ45-φ200

L/D ratio: 16-35

Hardness after hardening and tempering: HB280-320

Nitriding hardness: 950-1100HV

Nitrided layer depth: 0.5-0.8mm

Nitrided brittleness: Less than grade 2

Surface roughness: Ra0.4

Linearity of screw: 0.015mm/m

Bimetallic layer depth: ≥3mm

Bimetallic hardness: HRC60-72

Hard-chrome plating hardness after nitriding: ≥950HV

Chrome-plating layer depth: 0.025~0.10mm



High-quality alloy steel

38CrMoAlA (JIS SACM645)

42CrMo (AISI 4140)





Hard-chrome plating

Alloy powder spray welding

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