Sold as a set 20mm Dia Extruder Screw, Barrel with 1.75/ 3mm Nozzle and 3PCS 40*40 220V Band Heater

20mm Dia Single Extruder Screw, 300mm Length Barrel and 1.75mm or 3mm Nozzle

for desktop plastic extruders

Package contain: 1x20mm screw, 1xBarrel, 1x3mm/1.75mm Nozzle, 3x150W 220V D40L40 Band Heaters, 3x K-Type Thermocouples.

Technical Parameters:

Maximum rotation speed: 60RPM

Maximum heating temperature: 450℃
Bimetallic layer depth: 3 mm
Bimetallic hardness: 57~69HRC
Hard-chrome plating hardness after nitriding: ≥950HV
Chrome-plating layer depth: 0.03-0.09mm
Surface roughness: Ra 0.4
Compression Ratios:  20mm extrusion screw is 2.8

Technical Information:

Main Base materials
1.38CrMoAlA (SACM645)
2.SKD-61 (Special Tool Steel)
3.42CrMo (Ultrahigh Strength Steel)
4.DC53 (Cold Work Die Steel)
5.W6Mo5Cr4V2 (High-Speed Tool Steel)
Main Alloy Materials
1.Ni-based alloy/Deloro alloy
2.Tungsten carbide/Wolfram carbide
3.NiCo-based alloy
4.Fe-based alloy
5.Co-based alloy
Processing Techniques
1. Heat treatment
2. Quenching
3. Bimetallic alloy welding for screw
4. Bimetallic alloy centrifugal casting for barrel
5. Hard-chrome electroplating
6. Linearity of screw:0.015mm

Drawing:

Screw:

Barrel:

Picture: