Flight-profiled, match-marked pair for even plasticising. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
Both screws of a pair are profiled in the same set-up so the flight geometry is identical, then hardfaced on the flight lands. They are match-marked so maintenance crews reinstall them on the same side every time.
If you are only replacing screws, send us your barrel bore measurements — we set the clearance against the actual bore, not a catalogue number.
Quote within one business day. We reply with a matching proposal, delivery date and price — no generic catalogue PDF.
Standard range shown. Every dimension below can be changed to your machine, resin and output — custom manufacturing is our daily business.
| Screw diameter | Ø45–150 mm |
|---|---|
| Supplied as | Matched, match-marked pair |
| Flight treatment | Hardfaced lands / nitrided |
| Profile accuracy | Machined in matched set-up |
| Clearance | Set to your measured bore |
| Material | 38CrMoAlA / 42CrMo |
| Lead time | 30–40 days |
The honest answer depends on your resin, not on price. Here is how we advise customers.
| Gas Nitrided (38CrMoAlA) | Bimetallic Alloy Lining | |
|---|---|---|
| Best for | Unfilled PE, PP, PS, ABS, virgin PVC | Glass-filled, mineral-filled, recycled, corrosive |
| Surface hardness | HV 900–1020, depth 0.45–0.7 mm | Alloy layer 2–5 mm, metallurgically bonded |
| Typical service life | Baseline | 3–5× baseline on abrasive resin |
| Cost | Lower | Higher, recovered through fewer stoppages |
| Certification | MTC with heat number | MTC + hardness records, third-party on request |
A new screw next to a worn one runs at a different clearance, wears unevenly and gives unstable output. Pairs are cheaper in the long run.
Yes — send bore measurements at several points and we set clearance to that.
Several times longer than untreated flights on filled PVC. Actual life depends on your filler loading — ask us for a realistic estimate for your compound.
For PVC pipe, profile and WPC extrusion on parallel twin-screw lines.
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Alloy-lined barrels for calcium-filled and recycled PVC formulations.
View Details →Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
