The counter rotating conical twin screw is one of our primary products.
 
We usually manufacture them with the base material of *8CrMoAlA and *0Cr. If you have a much higher requirement on the anti-abrasion and anti-corrosion, the material of SKD*1 and fully hardened powder are both available. Depending on the different process applications, different types of surface treatment are provided, such as nitriding, alloy sprayed, hard chrome plated, etc. 
 

We are able to provide conical screws from ф*5／ф*5 to ф*2／ф**8, with maximum length ***0mm and their correspondent barrels (cylinders).

Technical data: 

Nitriding thickness: 0.**0.8mm
Nitriding hardness: ï¼ž**0HV
Surface roughness: Ra0.4um
Surface Straightness: 0.**5mm/m 
We also manufacture the specification (diameter, length-diameter ratio, nitriding thickness, nitriding hardness) per your detailed request.