Custom High Precision Corrosion Resistant CNC Machined Parts and CNC Turning Parts
Custom precision stainless steel parts are CNC machined or turned components manufactured from stainless steel grades including 303, 304, 316, or 17-4PH. These parts are widely utilized across multiple industries:
- Medical devices
- Food processing equipment
- Automotive systems
- Industrial machinery
Key advantage: Excellent corrosion resistance combined with dimensional stability under tight tolerances.
Project: Food-grade valve component
Material: SUS316
Process: CNC turning + milling + polishing
- Surface roughness requirement: Ra ≤ 0.8 μm
- Tight tolerance: ±0.01 mm
- Reduced cutting speed by 18%
- Used carbide tools with TiAlN coating
- Applied multi-stage polishing
- Surface finish improved from Ra 1.6 to 0.6 μm
- Scrap rate reduced by 27%
- Delivery stability improved (on-time rate 98%)
Technical Insight: Stainless steel is prone to work hardening—tool selection and cutting strategy are critical for successful machining.
| Grade | Best For | Key Feature |
|---|---|---|
| 303 | High-speed machining | Easy to machine |
| 304 | General industrial use | Balanced performance |
| 316 | Marine / food / medical | Superior corrosion resistance |
| 17-4PH | Aerospace / high strength parts | Heat-treatable, high strength |
Buyer Tip: If your part is exposed to chemicals or moisture, 316 stainless steel is often worth the extra cost.
- Standard CNC: ±0.05 mm
- Precision parts: ±0.01 mm or tighter
Common Issue: Over-specifying tolerance increases cost by 20-50% unnecessarily.
| Finish Type | Roughness (Ra) | Application |
|---|---|---|
| As-machined | 1.6-3.2 μm | Internal components |
| Fine machining | 0.8-1.6 μm | General visible parts |
| Polishing | ≤0.8 μm | Medical / food-grade |
Before choosing a supplier, confirm they offer:
- 3/4/5-axis CNC machining
- CNC turning (for shafts & round parts)
- Surface treatment (polishing, passivation)
- Inspection equipment (CMM, projector)
Real Issue: 40% of quality disputes come from insufficient inspection capability, not machining errors.
- Solution annealing (for corrosion resistance)
- Passivation (removes free iron)
- Electropolishing (ultra-smooth surface)
Pain Point Solved: Rust spots on stainless parts are often due to missing passivation, not poor material quality.
| Factor | Stainless Steel | Aluminum |
|---|---|---|
| Strength | Higher | Medium |
| Corrosion Resistance | Excellent | Good |
| Machinability | Lower | High |
| Cost | Higher | Lower |
Conclusion: Choose stainless steel for durability and corrosion resistance, aluminum for lightweight applications and cost efficiency.
Before placing an order, request the following documentation:
- Material certificate (Mill Test Report)
- Dimensional inspection report
- Surface roughness data
- Real application case or samples
- Production photos or videos
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Have questions about our products or want to discuss a custom order? Our team is ready to help you.