Central spindle with helical flights matched to the roller set. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
The spindle drives the whole planetary system. Its helical flights must be timed to the rollers — if the geometry drifts, the rollers load unevenly and wear accelerates on one side.
Machined and nitrided to drawing, supplied with or without the matching roller set.
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.
| Diameter | To drawing |
|---|---|
| Flight design | Helical, timed to roller set |
| Material | 38CrMoAlA nitrided |
| Hardness | HV 900–1020 |
| Fit | Matched to your roller geometry |
| Supply | Spindle alone or full set |
| Lead time | 35–50 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 |
Spindle alone if your rollers and barrel measure within tolerance. We will tell you honestly which we recommend after seeing your measurements.
Flight geometry is machined to the roller specification and checked before shipment; records ship with the part.
Yes, if the wear is even. Severely worn spindles need the drawing — send both if you can.
For planetary roller extruders in rigid PVC compounding and calendering.
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Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
