Twin-Screw Extruder Screw Shafts
- Multiple spline forms: single key, R-key, rectangular, hexagonal, involute
- Diameter Ø10–200 mm
- Available shaft length 1-15 meters, suiting machines from laboratory scale to large industrial twin-screw extruders
The screw shaft serves as the screw assembly's load-bearing and power-transmission core, delivering high torque from the gearbox to each screw element while continuously supporting high torsional and axial loads. The extruder screw system's strength, rigidity, and running stability are all determined by this component.
The material performance, heat treatment, and spline precision of a screw shaft directly impact torque-transmission efficiency, screw element assembly accuracy, and overall extrusion machine reliability demands that increase under high-torque, high-load conditions.
Lesun makes screw shafts from high-strength alloy structural steel that has been through-hardened and subjected to additional heat-treatment processes to increase tensile strength, torsional strength, and fatigue life. High-precision spline or keyway constructions provide dependable transmission, precise positioning, and stable screw assembly, and are compatible with the world's leading twin-screw extruder platforms.
Shaft Profiles
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Single-Key Shaft -
Rectangular Spline Shaft -
Hexagonal Shaft -
Involute Spline Shaft -
R-Key Shaft
Manufacturing Method
- Compatible with machines featuring screw diameters of 180mm or larger;
- Maximum length-to-diameter ratio of 68D and a length of 15 meters.
Screw Shaft Accessories
- Diameter: Ø10-200mm
- Length: 1000–15000mm
- L/D Ratio: 1–68D
- Involute Standard: DIN 5480/ GB/T 3478/ANSI B92.1/ISO 4156/JIS B 1602
- Spline Type: Single key / rectangular spline / hexagonal / involute spline / customized
- Spline Modulus: 1.5 / 2.0 / 2.5 / 3.0 / 4.0
- Material: A40/A70/A80/Stainless
- Tensile Strength: ≥1250Mpa
- Yield Strength: ≥1050Mpa
- Torque Capacity: 5–18
(Multiple material grades cover torque levels 5–18)
| Product | Code | Material | Process |
| Screw Shaft | A40 | Alloy Structural Steel | Through Hardened |
| A70 | Hot Work Tool Steel | Through Hardened | |
| A80 | Hot Work Tool Steel | Through Hardened | |
| S60 | Martensitic Stainless Steel | Quenched and Tempered |
- Precision spline machining: high-accuracy splines ensure stable engagement between shaft and screw elements, reducing wear, clearance growth, and stress concentration for efficient, reliable torque transmission
- Material and heat treatment: alloy steels selected by torque level and operating condition, combined with heat treatment to balance strength, toughness, and fatigue life
- Cold-rolled forming: as twin-screw extruders advance toward high specific torque, cold-rolled involute splines have become the mainstream process for twin-screw extruders at torque levels of 11 Nm/cm³ and higher. Compared with conventional cut splines, cold rolling creates continuous metal grain flow, markedly improving torsional strength, fatigue resistance, and service life for high-load, long-cycle stable operation
- OEM-compatible customization: design and manufacture of screw tip and spline-sleeve components, compatible with the major twin-screw extruder platforms worldwide
