As a screw and barrel manufacturer in India, we build both nitrided and bimetallic screws and barrels to suit the material you run and the wear it causes. Choosing the right metallurgy is what decides how long the assembly lasts before output and melt quality start to drop.
Nitrided screws & barrels are machined from nitriding steel (typically 31CrMoV9 / EN41B) and gas-nitrided to a hard, wear-resistant case around 900–1000 HV. They are the economical, reliable choice for PVC, PE, PP and most unfilled thermoplastics, and cover the majority of wire and cable extrusion.
Bimetallic screws & barrels use a centrifugally cast alloy liner (nickel- or cobalt-boron and tungsten-carbide grades) metallurgically bonded to the bore, reaching roughly 60–65 HRC. This is the answer for abrasive, glass-filled, flame-retardant and highly filled compounds, and for XLPE and masterbatch work, where a bimetallic barrel can last several times longer than a nitrided one.
We manufacture new screws and barrels for any extruder make or model, in custom diameters and L/D ratios from 20:1 to 33:1, with compression ratios matched to your polymer. We also supply matching extruder tooling and spare parts, and can rebuild worn assemblies to original tolerance.
Need a quote? Tell us your extruder make, screw diameter and material — request a quote and we will send specifications and pricing.
Screws and barrels are critical components in extrusion processes. They work together to melt, mix, and convey raw materials through the extruder to create the desired product shape.
Screws and barrels are typically made from high-quality, wear-resistant materials such as nitrided or bimetallic alloys. These materials ensure durability and long service life, even under demanding processing conditions.
Yes, we offer customized solutions tailored to meet your specific needs. Whether it’s a unique design, material choice, or specific dimensions, our team can create screws and barrels that enhance your production process.
Selecting the right screw and barrel depends on factors such as the type of material being processed, the desired product characteristics, and the specific requirements of your production process. Our experts at Sai Extrumech can help you choose the best components for optimal performance.
Related guide: new to screw geometry? Read Extruder Screw Design Explained — the three zones, L/D and compression ratio, and how to match a screw to your polymer.
