Steel Shaft
Precision machined steel shafts for automotive drivetrains, industrial machinery, and wind energy systems. Available in various steel grades with ground, polished, or treated surfaces.
Steel Shaft
Steel shafts are critical mechanical components that transmit rotational power and motion between machine elements. They are found in virtually every mechanical system, from automotive engines and transmissions to industrial gearboxes and wind turbines.
Our steel shafts are manufactured from premium alloy steels including 42CrMo, 40Cr, 45#, and stainless grades. Each shaft undergoes precision turning, grinding, and optional heat treatment to meet strict dimensional tolerances and surface finish requirements.
Technical Specifications
Standard Dimensions
| Application | Diameter (mm) | Length (mm) | Material | Tolerance |
|---|---|---|---|---|
| Motor Shaft | 20–80 | 100–600 | 45# / 40Cr | h6 |
| Gearbox Shaft | 30–150 | 200–1200 | 42CrMo / 20CrMnTi | h6 |
| Drive Shaft | 30–100 | 500–2000 | 40Cr / 42CrMo | h7 |
| Roller Shaft | 50–300 | 1000–6000 | 45# / 42CrMo | h7 |
| Wind Turbine Shaft | 200–800 | 2000–12000 | 42CrMo4V | h8 |
| Pump Shaft | 15–120 | 200–1500 | SS304 / SS316 | h6 |
* Custom dimensions and configurations available
Material Specifications
| Steel Grade | Composition | Hardness Range | Application |
|---|---|---|---|
| 45# | C 0.45% | HRC 22-28 | General purpose shafts |
| 40Cr | C 0.4%, Cr 1% | HRC 28-35 | Higher strength shafts |
| 42CrMo | C 0.42%, Cr 1%, Mo 0.25% | HRC 30-45 | Heavy-duty shafts |
| 20CrMnTi | C 0.2%, Cr 1.2%, Mn 1%, Ti | HRC 58-62 | Carburized gear shafts |
| SS304/316 | Austenitic SS | HB 150-200 | Corrosion-resistant shafts |
Performance Parameters
| Parameter | Standard Range | Custom Options |
|---|---|---|
| Diameter | 10–800mm | Up to 1200mm |
| Length | 100–12000mm | Up to 18000mm |
| Tolerance | h6–h9 (IT6-IT9) | IT5 available |
| Surface Roughness | Ra 0.4–1.6μm | Mirror polish Ra 0.1μm |
| Straightness | ≤0.02mm/m | Custom |
| Roundness | ≤0.005mm | Custom |
Manufacturing Process
Our precision machined parts are manufactured through a 12-step CNC machining process from certified steel bars, including heat treatment, precision grinding, and rigorous QC to meet tight tolerances and demanding performance requirements.
Raw Material Receiving & Testing
Certified forged or hot-rolled round bars are received with EN 10204 3.1/3.2 certificates. Incoming inspection checks chemistry, hardness, UT cleanliness, and dimensional tolerance.
Sawing / CNC Cutting to Blanks
Bars are cut to blank lengths using CNC band saws or circular cold saws with ±0.5 mm length tolerance, minimizing material waste.
Rough Turning
Blanks are rough-turned on CNC lathes to remove scale, decarburization, and forging skin, leaving 1.5–2 mm stock per side for finishing operations.
Heat Treatment
Components undergo quenching and tempering (Q&T), carburizing, or induction hardening per specification to achieve case hardness (HRC 55–62) and core toughness.
Finish Turning & Boring
Precision CNC turning achieves OD/ID tolerances to IT6–IT7 with Ra 0.8–1.6 μm surface finish. Sleeve bushings are internally bored and honed to H7 tolerance.
Milling, Drilling & Keyway Cutting
Keyways, oil grooves, cross holes, and wrench flats are machined on CNC machining centers or using broaching/slotting machines.
Cylindrical & Surface Grinding
Critical diameters and sealing surfaces are precision ground to achieve Ra 0.2–0.4 μm and tight dimensional tolerances (≤0.01 mm).
Dynamic Balancing (Rotating Parts)
Shafts and rotating components are balanced on dynamic balancing machines to G2.5 or G6.3 grade to prevent vibration at operating speeds.
NDT (UT/MT/PT)
Critical components undergo ultrasonic testing for internal soundness and magnetic particle or dye penetrant testing to detect surface cracks.
Surface Treatment
Parts are blackened, zinc-plated, phosphated, or coated with anti-corrosion oil as required. Mating surfaces are protected with peelable coatings.
Dimensional & Hardness QC
100% dimensional inspection using micrometers, bore gauges, CMM; hardness testing (HRC/HRB/HV) on every batch; thread gauging for threaded connections.
Rust Prevention & Packaging
Parts are oiled with rust-preventive oil, wrapped in VCI anti-corrosion paper, packed in plywood cases with desiccant, and labeled per customer requirements.
Applications
Where our products deliver proven performance across industries worldwide.
Marine Propulsion Shafts
Intermediate, thrust, and propeller shafts in forged 34CrNiMo6/42CrMo4, machined with class-certified mechanical properties for ocean-going vessels.
✓ LR/DNV/ABS witnessed testing
Turbine & Generator Shafts
Large UT-verified rotor and turbine shafts with stringent centerline soundness requirements for power generation equipment.
✓ UT centerline class per EN 10228
Industrial Pump & Compressor Shafts
Precision-ground pump and compressor shafts in stainless and alloy grades for chemical, water, and process industries.
✓ Dynamic balancing on request
Drive & Axle Shafts
Automotive and truck drive shafts, half-shafts, and axle spindles in case-hardening and QT grades.
✓ Automotive-grade traceability
Wind Turbine Main Shafts
Large forged main shafts for wind turbine drivetrains with flange machining and full volumetric inspection.
✓ Multi-tone forgings to drawing
Custom Shafts to Drawing
Complete shaft supply from forging through heat treatment to finish machining and dynamic balancing, per your drawing.
✓ Turnkey forged-to-finished
Frequently Asked Questions
What shaft types do you manufacture?＋
Marine propulsion shafts (intermediate/thrust/propeller), turbine and generator rotor shafts, pump and compressor shafts, wind turbine main shafts, and automotive drive/axle shafts.
What size range can you produce?＋
Diameters from 50 mm to 1200 mm, lengths to 12 m, finished weights to 30+ tons.
What materials are used for shafts?＋
42CrMo4, 34CrNiMo6, 40Cr, 17CrNiMo6, stainless 410/420/304/316, and per-drawing grades with QT or normalized heat treatment.
How do you guarantee internal soundness?＋
100% ultrasonic testing per EN 10228-3/-4 with centerline inspection classes, plus stepwise mechanical testing to verify through-section properties.
Can you supply finish-machined and balanced shafts?＋
Yes — complete supply chain from forging, heat treatment, rough and finish machining, grinding, to dynamic balancing, delivered to drawing.
Do you provide classification society certification for marine shafts?＋
Yes — LR, DNV, ABS, BV witness testing and certification for material and dimensional acceptance.
What is the typical lead time?＋
8–16 weeks for forged-and-machined shafts depending on size; stock material shafts faster. Contact us with your drawing.
What is the minimum order quantity?＋
From single pieces — shafts are quoted per item based on size, material, and machining scope.
What tolerances can you hold?＋
Machined journals to IT6/IT7, surface finish to Ra 0.4, runout and concentricity per drawing; grinding to tighter on request.
What documentation is provided?＋
EN 10204 3.1/3.2 MTCs, UT reports, heat treatment charts, machining dimensional reports, and balance certificates.
Ready to Order Steel Shafts?
Get a competitive quote within 24 hours. Our engineering team provides expert consultation for your shaft manufacturing needs.
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