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45# Steel Precision Stepped Shaft
This precision stepped shaft made of 45# carbon steel acts as a core transmission, positioning and load-bearing connector for industrial machinery, widely used in transmission assemblies, tooling fixtures and automated production equipment. Manufactured by high-precision one-time CNC turning, the shaft features outstanding concentricity and stable dimensional tolerance. 45# medium carbon steel balances strength and ductility perfectly; quenching & tempering heat treatment can be applied to boost load capacity, resisting permanent deformation during long-term high-speed operation, making it ideal for medium & heavy-load industrial working conditions.
- Machining Process: High-precision CNC turning, optional turn-mill composite machining
- Dimensional Accuracy: Tight tolerance up to ±0.005 mm
- Surface Roughness: Up to Ra 0.8;
- Available finishes: fine turning
- Standard Material: 45# medium carbon steel, optional 40Cr, S45C, 42CrMo alloy steel
- Production Service: Custom prototype, low-volume trial run & mass production all-in-one service
- Offer: Free custom quotation available
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We specialize in custom CNC machining of carbon steel shaft parts. Our workshop is equipped with high-precision CNC lathes, turn-mill composite centers, drilling & tapping machines and complete heat treatment equipment. With years of experience in manufacturing stepped shafts, positioning shafts and drive shafts, we can stably control core dimensional tolerances within ±0.01 mm. We provide one-stop services including drawing optimization, CNC cutting, heat treatment, surface treatment and full finished-product inspection, serving clients engaged in CNC machining, automation equipment, mold tooling and general machinery industries.
Core Advantages
- High Rigidity & Anti-deformation: High-strength 45# carbon steel boasts outstanding rigidity, resisting bending deformation under heavy equipment load and long-term stress.
- Ultra-high Positioning Concentricity: One-clamping precision CNC turning guarantees precise concentricity of stepped outer diameters and shaft-end threads, error-free repeated positioning.
- Excellent Wear Resistance & Long Lifespan: Optional quenching & tempering heat treatment and anti-rust surface processes boost surface hardness and corrosion resistance, ideal for high-frequency continuous operation.
- Fully Customizable Non-standard Sizes: Custom step segments, shaft diameters, shaft lengths, shaft-end threads and central hole structures available to match all kinds of equipment assembly requirements.
Common Applications
- CNC Machining Equipment: Internal transmission stepped shafts of machine tools, positioning mandrels for tooling fixtures
- Automated Production Lines: Position support shafts for robotic arms, transmission drive shafts for conveyor lines
- Assembly Workstations: Limit shafts for assembly jigs, connecting shafts for bearing installation
- Molds & General Machinery: Mold ejector shafts, drive spindles for reducers and pump bodies
Specification Table
| Parameter Item | Details |
| Standard Raw Material | 45# medium carbon steel; optional 40Cr, S45C, 42CrMo alloy steel |
| Machining Technology | CNC turning forming, optional turn-mill composite, end drilling & tapping |
| Dimensional Tolerance | Standard ±0.01 mm; high-precision custom: ±0.005 mm |
| Surface Roughness | Standard fine turning Ra1.6; high-gloss mirror Ra0.8 |
| Machinable Shaft Diameter Range | Custom per drawing, common range: 5 mm–120 mm |
| Machinable Overall Length Range | Custom per drawing, common range: 10 mm–400 mm |
| Double-End Custom Structure | Metric / imperial external threads, central through holes, counterbore holes |
| Heat Treatment Options | Normalizing, quenching & tempering, full quenching to upgrade hardness & load capacity |
| Anti-Rust Surface Treatment | As-machined finish, black oxide coating, zinc electroplating, roller polishing |
| Working Temperature Range | -10℃ ~ +180℃ |
| Factory QC Standard | 100% full dimension measurement, concentricity runout inspection, surface defect screening |
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