Large-format conical twin set for big-diameter PVC pipe lines. Machined in our own Henan workshop — to your drawing, or reverse-engineered from your worn parts.
Large-format conical sets push our machining capability — the bores are long, the taper must be exact and the flanges carry real load. We build these on our own deep-hole boring equipment, in-house, up to Ø300 mm.
Supplied nitrided or bimetallic, with matched screws and flanges machined to your line.
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.
| Model | 110/220 conical twin |
|---|---|
| Max diameter in-house | Ø300 mm |
| Material | 38CrMoAlA nitrided / bimetallic |
| Bore | Tapered, deep-hole bored + honed |
| Flanges | Heavy-duty, to drawing |
| Screws | Matched, hardfaced options |
| Lead time | 45–55 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 |
Yes — up to Ø300 mm is machined in-house on our own equipment. That is our stated limit and we do not exceed it.
No. If it is beyond Ø300 mm we tell you up front rather than passing it to an unknown workshop.
Taper, roundness and surface finish are measured and recorded; the inspection sheet ships with the set.
Matched screw and barrel for SJSZ 51/105 conical twin extruders.
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Send your machine model, drawing or worn sample — we reply with a matching proposal and quotation within one business day.
