Porduct Name: Parallel double-hole barrel screws   [back]

Specification：   

Φ45/90、	Φ45/100、	Φ50/105、	Φ51/105、	Φ55/110、	Φ58/124、	Φ60/125、	Φ65/120、
Φ65/132、	Φ68/143、	Φ70/140、	Φ75/150、	Φ80/143、	Φ80/156、	Φ92/188

Technical index：
Quenching and tempering hardness：HB240-280
Nitriding hardness：Hv950-1020
Nitriding depth：0.45-0.8mn
Nitriding brittleness：≤Grade II
Surface roughness：Ra0.4um
Screw straightness：0.015mm
Surface hard chrome plating hardness after nitriding：≥950Hv
Thickness of chromium coating：0.05~0.10mm
Double alloy hardness：HRC58-65
Double alloy depth：0.8-2.0mm
Screw diameter：PX-Φ65/2-Φ150/2
Length-diameter ratio：L/D=18-30
Screw compression ratio can be designed according to different material and different raw material.