CNC Turned Steel Spindles
CNC turned steel spindles and shaft parts with tolerances to IT5 (±0.005 mm) and surface finish below Ra 0.2 µm. Turning, heat treatment, grinding and polishing in one process chain. Request a quote.
Description
CNC Turned Steel Spindles and Shaft Parts
Gnee Steel machines CNC turned steel spindles and shaft parts for drive systems, machine tools and semiconductor equipment. From simple smooth shafts to high-precision spindles held to IT5 tolerance, we cover the full turning process chain in-house: rough turning, semi-finishing, heat treatment, fine grinding and polishing.
Key Capabilities
- Shaft classes: smooth and stepped shafts (motor shafts, drive shafts), keyed and splined shafts, threaded and eccentric shafts, camshafts and lead screws.
- Precision spindles for machine tools and semiconductor equipment with dimensional tolerance to IT5 (±0.005 mm).
- Surface roughness to Ra 0.2 µm with optional honing or laser correction for ultra-precision shafts.
- Controlled micro-residual stress and roundness ≤ 0.5 µm on high-end spindles, verified by online measurement with thermal-deformation compensation.
Turning Process for Shaft Parts
Simple shafts are completed on CNC lathes through rough turning, semi-finishing and finishing, with key diameters controlled to ±0.01 mm. Complex shafts - for example drive shafts with keyways and splines - combine turning and milling in a single setup so that re-positioning errors are avoided. Slender shafts are machined with a steady rest or a follower rest to prevent deflection, and hardened-steel shafts receive grinding as the final operation.
Ultra-Precision Spindle Machining
High-end spindles and lead screws for semiconductors and precision machinery demand more than tight dimensions. Our process chain - turning, heat treatment, fine grinding and polishing - runs in a temperature-controlled environment (20 ± 1 °C) with vibration isolation. Online measurement systems compensate for thermal deformation in real time, holding roundness to ≤ 0.5 µm and form accuracy at the nanometre level.
Machining Tolerances
Standard dimensional tolerances follow ISO 2768-m as a baseline; tighter classes are produced to drawing.
| Dimension (mm) | Dimensional tolerance | Flatness range (mm) | Flatness tolerance |
|---|---|---|---|
| 0 – 6 | ±0.05 | 0 – 30 | 0.05 |
| >6 – 30 | ±0.10 | >30 – 100 | 0.10 |
| >30 – 120 | ±0.15 | >100 – 300 | 0.20 |
| >120 – 400 | ±0.20 | >300 – 1000 | 0.30 |
| >400 – 1000 | ±0.30 | >1000 – 3000 | 0.40 |
Angular tolerance ±1° over 0–10 mm and verticality/symmetry to 0.2–0.5 mm are achievable; confirm your drawing requirements with our engineers.
Materials We Turn
Shaft parts are machined from carbon and alloy steels (1045, 4140, 4340, 8620), stainless steels, tool steels and hardened steels, with grinding or polishing where the design requires it. If your application specifies another material, we will confirm machinability and delivery with you before production.
FAQ
Can you machine spindles from my drawings or samples?
Yes. Send your 2D/3D drawings (DWG, DXF, STEP) or a physical sample; our engineers will confirm tolerances, materials and process before production, and we can make a prototype first if needed.
How do you protect my design drawings?
We sign an NDA before receiving your drawings, and your files are stored in an access-controlled environment.
What is the tightest tolerance you hold on spindles?
For precision spindles we hold IT5 (±0.005 mm) on critical diameters with roundness ≤ 0.5 µm, verified by online measurement in a temperature-controlled shop.
Do you offer assembly and custom packaging?
Yes. We can assemble parts and provide custom retail-ready packaging if you require a ready-to-sell delivery.
Precision CNC machining
Our Services
Manufacturing Equipment
Surface Treatment
Testing equipment
Every spindle is checked with calibrated measuring equipment before dispatch, and mill test certificates and inspection reports are provided on request. For drawing-protected projects, we sign a non-disclosure agreement before receiving your files.
Manufacturing Flow Chart
about Us
As a leading CNC machining service provider for foreign trade in China, we adhere to the principle of "German standards, Chinese costs" and provide global customers with precision components comparable to European and American quality. Our factory boasts over 50 CNC machines and a monthly production capacity exceeding 500,000 pieces.
Service Advantages:
Flexible production line: Supports mixed production of multiple materials, including stainless steel and plastics (PEEK/nylon). High-end surface finishes, such as mirror polishing and micro-arc oxidation, enhance product value.
Supply chain integration: We provide supporting services such as raw material procurement and customs clearance to reduce overall costs for our customers.
End applications include precision gears, sensor housings, and automated fixtures, primarily exported to the EU and North America. Choose us, and you'll enjoy peace of mind!
References
ISO 2768 - General tolerances: linear and angular dimensions without individual tolerance indications.
ISO 1101 - Geometrical product specifications: geometrical tolerancing.
ASTM A108 - Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished (material basis).
Request a Spindle Quotation
Send your drawing, material, quantity and target tolerance to info@gneemetal.com, or use the Inquiry form - our engineers will reply with a process proposal and quotation within 24 hours.
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