✅ What you’re buying

The “screw & barrel” pair is a critical component in plastic extrusion machines: the screw rotates and conveys, melts, mixes, and pushes material forward, while the barrel houses the screw and supports heaters, wear surfaces, and back-pressure. As one supplier explains:

• Screw diameter / length / geometry / material
• Barrel bore diameter, length, liner or wear surface material, surface treatment
• Matching the screw and barrel for correct clearance, wear resistance, corrosion resistance depending on the polymer/fillers you process
• OEM or custom design if needed for your machine, material, output

🔍 Good providers & what they offer

• SpiraMelt Technologies (USA) offers custom extrusion screws & barrels for diameters Ø12mm–450mm, including bimetallic barrels, hardfacing, coatings. SpiraMelt Technologies
• TIR Feed Screws & Barrels (USA) manufactures screws and barrels “to OEM specs … servicing all makes, models and sizes of feed screws and barrels.” TIR 供料螺杆和筒夹
• You can also find used screw & barrel sets (which may be cost-effective but must check wear & clearance) via suppliers like Perry Equipment. Perry Equipment

🛒 Sample ready-to-buy product options

Here are several product listings you can inspect—some small-diameter / 3D-filament style, others more industrial. Each item is cited so you can click through for specs and pricing.

Plastic Extruder Screw and Barrel – Film Blowing Solutions

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65/132 Extruder Screw & Barrel (PVC Conical Twin)

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Alibaba.com

30‑35mm Diameter Extruder Screw and Barrel

20mm Dia Extruder Screw & Barrel with Nozzle Kit

Small‑Diameter 20 mm Extruder Screw & Barrel OEM

16mm Dia Extruder Screw & Barrel

16mm Extruder Screw, Barrel & Nozzle Set

3D Printing Pellet Extruder Screw and Barrel Set

And here is a little commentary on each:

• Plastic Extruder Screw and Barrel – Film Blowing Solutions: A heavy-duty screw & barrel pair targeted at film blowing lines — likely larger size, industrial grade.
• 65/132 Extruder Screw & Barrel (PVC Conical Twin): This is a conical twin-screw barrel set (sizes 65/132) for PVC extrusion (industrial scale).
• 30‑35mm Diameter Extruder Screw and Barrel: Mid-range industrial size (30-35mm diameter) good for smaller production lines.
• 20mm Dia Extruder Screw & Barrel with Nozzle Kit: Smaller diameter set, includes nozzle kit — good for smaller machines or lab/scale production.
• Small‑Diameter 20 mm Extruder Screw & Barrel OEM: OEM style small diameter pair — may be useful for replacement or special equipment.
• 16mm Dia Extruder Screw & Barrel: Very small diameter, likely for specific/bench scale or specialized machines.
• 16mm Extruder Screw, Barrel & Nozzle Set: Similar small diameter with nozzle included — ideal for very small output or prototyping.
• 3D Printing Pellet Extruder Screw and Barrel Set: More hobby/3D-printing scale rather than full industrial — still illustrates how varied the market is.

📋 How to choose the right screw & barrel set

Here are key criteria to evaluate:

1. Diameter and length: Match to your extruder machine. Larger diameter = higher throughput.
2. Material & surface treatment: If processing filled, abrasive, or corrosive materials, look for hardened tool steels, nitriding, bimetallic liners etc. As some providers note. SpiraMelt Technologies+1
3. Clearance & fit: The gap between screw and barrel is vital for performance and wear.
4. Geometry / design of screw: Flight depth, mixing sections, venting, barrier screws — depends on your material.
5. Brand, manufacturing quality, tolerance: Better precision reduces leakage/backflow and improves efficiency.
6. Custom vs standard: If your material is unusual (high filler, fiber, bio-resin, etc.) you may need a custom design.
7. New vs used: Used can be cost-effective, but check wear, clearance, condition of barrel liner, screw flights etc.
8. Support & replacement parts: Availability of spares, service, lead time for replacement.

📞 About my company & contact

If you’re looking for custom single-screw or twin-screw barrels & screws, my company Zhoushan Juyuan Machinery Co., Ltd. (China) offers OEM/ODM manufacturing of screw & barrel sets, including bimetallic liners, corrosion-resistant barrels, precision machining, and global export.
Contact Information:

• Website: https://juyuan-machinery.com/
• Email: cxj.job@gmail.com
• WhatsApp/WeChat/Phone: +85244499051