Cast Screw Manufacturer — Custom Cast Auger & Screw Rotor Casting
Cast Screw ManufacturerISO 9001:2015 Foundry GroupSand Casting & Investment CastingOEM / ODM ServiceQuotation in 24 Hours
Leesh Holdings is a professional cast screw manufacturer supplying custom cast screw, cast auger and screw rotor components to OEM buyers worldwide. We cast in carbon steel, stainless steel and wear-resistant alloy steel, with in-house tooling, heat treatment, CNC machining and full inspection under one roof. Send your drawing or a worn sample — our engineers review manufacturability and return a quotation within 24 hours.
What Is a Cast Screw?
A cast screw is a helical conveying component — also known as a cast auger, screw conveyor flight or cast auger screw — that rotates inside a trough or tube to move, mix, dose, lift or press materials. Compared with welded-flight fabrications, an integral casting has no weld seams to crack, higher wear resistance and smoother, better-balanced rotation at high speed.
We match the process to your part: the sand casting screw route for large-diameter augers at low tooling cost, or the investment cast screw route (silicon sol lost wax) for small, complex, near-net-shape components. Popular materials range from cast steel auger grades such as ASTM A148, 42CrMo and 4140 to SUS304 / SUS316 / CF8M stainless steel for corrosive media.
Cast Screw Specifications
Every part is produced strictly to your drawings — the table below shows our typical production range for screw and auger castings.
| Item | Specification |
|---|---|
| Product Range | Screw, auger and screw rotor castings; single, double and variable-pitch flight options |
| Materials | Carbon steel, cast alloy steel (ASTM A148, 42CrMo, 4140, 8630), stainless steel (SUS304, SUS316, CF8M), heat-resistant and wear-resistant alloys — per customer requirements |
| Casting Process | Sand casting, investment casting (silicon sol / water glass), shell molding |
| Dimensions | Outer diameter 50–2000 mm; shaft length up to 6000 mm — made to drawing |
| Casting Weight | 0.05 kg – 5,000 kg (process dependent) |
| Tolerance | Investment casting CT4–CT6; sand casting CT8–CT10; CNC machining to ±0.02 mm |
| Surface Roughness | Ra 3.2–12.5 μm as cast; polishing and hardfacing on request |
| Heat Treatment | Normalizing, quenching and tempering, solution treatment and aging |
| Surface Treatment | Shot blasting, zinc / chrome plating, powder coating, hardface overlay |
| Inspection | Spectrometer chemistry, CMM dimensions, UT / MT / X-ray NDT, dynamic balancing |
| Certification | ISO 9001:2015 foundry; EN 10204 3.1 material certificates |
| Customization | OEM & ODM; one-piece replacement to volume production, made to drawings or samples |
Manufacturing Process Flow
Each casting follows a controlled production route with documented quality gates from drawing review to export packing.
| Step | Process | Quality Control |
|---|---|---|
| 1 | Drawing & DFM review | 3D modeling, casting simulation, tolerance confirmation |
| 2 | Tooling & pattern making | Metal dies and patterns; first-article inspection |
| 3 | Molding & pouring | Chemistry verified by spectrometer before every pour |
| 4 | Shakeout, cutting & fettling | Integral flight, no weld seam; 100% visual check |
| 5 | Heat treatment | Mechanical property test on each batch |
| 6 | CNC machining & balancing | Runout, wall thickness, dynamic balancing |
| 7 | Final inspection | CMM, UT / MT / X-ray, hardness and PMI |
| 8 | Surface treatment & packing | Rust-proof export packing with full documents |
Applications of Cast Augers & Screw Rotors
| Industry | Typical Application | What We Supply |
|---|---|---|
| Wastewater & Environmental | Grit classifiers, sludge conveyors, dewatering presses | Cast auger, screw rotor |
| Plastics & Rubber | Extruder screws, kneading and feed screws | Wear-resistant cast screw |
| Agriculture | Seed meters, feed augers, grain conveying | Cast steel auger |
| Mining & Bulk Handling | Screw conveyors, feeders, ash handling plants | Large-diameter screw rotor |
| Food & Chemical | Mixing screws, dosing augers, heated trough screws | SUS304 / SUS316 cast auger screw |
| Petroleum & Power | Solids-control augers, ash screw conveyors | Alloy steel screw castings |
Leesh Holdings Steel Casting Services
Beyond a single part, Leesh Holdings operates as a full-process steel casting group — sand casting, silicon sol and water glass investment casting, precision forging and die casting — with finishing and inspection all under one roof, serving railway, automotive and truck, construction machinery, mining, forklift, agricultural machinery, marine, petroleum, pump and valve, power equipment and hardware industries.
- Two investment casting routes: silicon sol (0.05–50 kg, CT4–CT6, Ra 3.2–6.3 μm) and water glass (0.10–100 kg, CT6–CT8, Ra 6.3–12.5 μm) — the process is matched to your tolerance and budget
- In-house heat treatment, CNC machining, mirror and electrolytic polishing, drilling and tapping, zinc / chrome plating and powder coating for assembly-ready parts
- Complete in-house inspection: spectrometer, tensile and low-temperature impact testing, X-ray, magnetic particle, ultrasonic flaw detection and CMM
- OEM & ODM support for every cast screw and cast auger project, with export documentation and quotation response within 24 hours
Frequently Asked Questions
What is the difference between a sand casting screw and an investment cast screw?
Sand casting suits large-diameter screw parts (typically above 200 mm outer diameter) with lower tooling cost and CT8–CT10 tolerance. Investment casting (lost wax) produces near-net-shape flights with CT4–CT6 tolerance and Ra 3.2–6.3 μm surface finish — the better choice for small and medium precision augers. Our engineers recommend the most cost-effective route after reviewing your drawing.
Can you make a cast auger screw from my drawings or a worn sample?
Yes. Send 2D or 3D drawings — or ship us the worn part. We measure it, build the tooling and confirm critical dimensions with a first-article report before mass production.
What materials do you use for screw and auger castings?
Carbon steel (Q235, 45#, 1045), cast alloy steel (42CrMo, 4140, 8630), stainless steel (SUS304, SUS316, CF8M) plus heat-resistant and wear-resistant grades. Chemistry is verified with a spectrometer before every pour, and EN 10204 3.1 certificates are supplied with shipment.
What is your MOQ and lead time for a custom cast screw rotor?
No strict MOQ — one-piece replacements and small batches are welcome. Typical lead time is 25–40 days depending on process, machining and heat treatment. Send your drawing today and receive a quotation within 24 hours.
Get Your Custom Cast Screw Quotation in 24 Hours
Send your drawings to our engineering team — we will review manufacturability, recommend the most cost-effective casting route and reply with pricing within 24 hours.
