Conical twin screw barrel for uPVC pipe lines, models SJSZ 51/105 to 80/156. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
The workhorse of the PVC pipe world: a conical twin with the right gelation curve turns dry blend into a steady pipe all shift. Our pipe screws carry a low-shear tip profile so the melt never overheats where the screws taper — the classic failure point of cheap conical sets.
Built for the full SJSZ range (51/105, 55/110, 65/132, 80/156) and matching European models. Send the extruder model and pipe diameter and we quote a matched set — screws, barrels, or both.
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.
| Models | SJSZ 51/105, 55/110, 65/132, 80/156 |
|---|---|
| Design | Low-shear tip, pipe gelation curve |
| Material | 38CrMoAlA nitrided HV 900–1020 |
| Barrel | Nitrided; bimetallic option for filled compounds |
| Typical pipes | Ø16–315 mm uPVC |
| Lead time | 25–40 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 |
It follows your extruder model — SJSZ 51/105 suits small pipe and conduit, 65/132 and 80/156 carry medium pipe output. Send the machine nameplate photo and we identify it.
Both wear as a pair. Measure flight land to bore clearance; once it exceeds roughly double the new-set value, output and gelation both suffer. Send the measurements and we will tell you what to replace.
Yes — screws, barrels or matched sets; for a set we machine both together and set the clearance ourselves.
Matched screw and barrel for SJSZ 51/105 conical twin extruders.
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Large-format conical twin set for big-diameter PVC pipe lines.
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Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
