Position: Home Page > Products > Parallel double-hole barrel screws > Parallel double-hole barrel screwssssssssssssss
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.