What This Part Is And Why It Is Made This Way
A screw pump rotor wears against an elastomer stator, so the helical profile and the surface hardness together decide how long the pump holds its flow. A rotor that is dimensionally correct but soft will still fail early.
Rotors are produced by shell moulding, ground, welded, machined, quenched and polished. D series, 2L6 series, 2L8 series and rotors customised to drawing can be supplied.
What You Get From This Route
Full route from casting through quenching to polishing under one supplier.
Annealed to 20-35 HRC for machining, then quenched at about 1020 °C to 59-63 HRC.
Helical profile and arc surface roughness inspected as specified items.
Application Scenarios
- Progressive cavity pumps in wastewater plants
- Slurry and sludge transfer pumps
- Food and chemical process pumps
- Dosing and metering pump rotors
Who It Is For
- Pump manufacturers
- Plants replacing worn rotors on installed pumps
- Distributors supplying pump spares
Technical Features
- Product series D, 2L6, 2L8 and drawing customised rotors
- Process: shell moulding, grinding, welding, machining, quenching, polishing, inspection and packing
- Heat treatment: annealed 20-35 HRC then quenched to 59-63 HRC
- Inspection: head appearance, casting deformation, key helical diameter and arc roughness
What Buyers Run Into Without This Specification
- Rotor hardness is quoted but never verified and wear life collapses.
- The helical profile drifts and pump flow falls below rating.
- Surface finish on the arc is rough and the stator wears prematurely.
Published Material Weight And Process Data
Figures below are the published capability for high alloy parts. Part specific values — tolerance on individual features, finish, packing — are confirmed at drawing review and marked TBC until then.
| Food Machinery Material | 1.4308 / 1.4309 / 1.4340 |
|---|---|
| Food Machinery Weight | 9 kg - 800 kg |
| Grate Bar Material | 1.4777 / 1.4776 / 1.4823 / 1.4743 / LH26 / EN-GJL-200 + 3%Cr |
| Grate Bar Weight | Typical products 2 kg - 50 kg; some grate bars and liners around 10 kg - 50 kg |
| Biomass Material | 1.4777 / 1.4776 / 1.4823 / 1.4855 |
| Working Temperature | Typical maximum around 1050 °C - 1150 °C depending on material and duty |
| Process | Shell moulding, lost wax and lost foam casting, plus CNC machining |
| Tolerance | Shell moulding normally CT9-10; lost wax normally CT8; surface roughness about Ra 12.5 |
| Part Specific Tolerance | TBC — confirmed against the customer drawing |
| Minimum Order Quantity | TBC — depends on the process route selected |
| Lead Time | TBC — confirmed with the production base at quotation |
How The Part Is Made And Checked
- Inspection — Dimensions, flatness, assembly clearance, 3D scanning, RT, PT, hardness, chemical composition and tensile testing.
- Material Control — Chemical analysis on each melt, sampling from the product body and third party testing for special elements.
- Heat Treatment — Rotors are annealed to 20-35 HRC before machining, then quenched at about 1020 °C to 59-63 HRC.
Quality management is based on ISO 9001 and covers supplier management, raw material inspection, production process control and final inspection. Inspection results are archived and traceable.
Options And Alternatives
Parts are produced to the customer drawing rather than to a fixed catalogue item, so material grade, machining scope, surface treatment and packing are all specified per order. Machining, dimensional control, surface treatment and necessary pre-assembly can be added to the same supply route.
Where another process family would suit the part better — for example a forging in place of a casting for a shock loaded connector — that comparison is raised during drawing review rather than after tooling is committed.
How To Specify This Part
Quote the pump series and the stator it works with, or send the rotor drawing. Confirm the required final hardness — the route anneals for machining and then quenches to 59-63 HRC, and stating the target avoids a rotor that machines easily but wears fast.
- Send the drawing with material, quantity, quality standard and target delivery date.
- State the inspection class and the zones it applies to, rather than a general note.
- Confirm the packing requirement and the lifting equipment available at the destination.
Related Guides
Other Parts In This Range
Stainless Steel Vessel Components
Cast and machined stainless vessel bodies
View specifications
Rotating and Drive Components
Stainless shafts and drive parts for hygienic equipment
View specifications
Assembled Machinery Components
Multi part stainless assemblies
View specifications
Precision Machined Structural Parts
Close tolerance stainless structures
View specificationsScrew Pump Rotor Series — Frequently Asked Questions
Which rotor series can you supply?
D series, 2L6 series, 2L8 series and other rotors customised to the customer drawing.
What hardness do finished rotors reach?
Rotors are annealed to 20-35 HRC before machining, then quenched at about 1020 °C to reach 59-63 HRC.
What do you need to prepare a quotation?
Drawings, material, quantity, quality standard and target delivery date.
Which inspection is included?
The inspection scope is agreed during drawing review. Rotors are annealed to 20-35 HRC before machining, then quenched at about 1020 °C to 59-63 HRC.
Get A Quotation For Screw Pump Rotor Series
Send the drawing and the application. We will confirm the process route, the production base and the inspection scope before quoting.