Stainless Steel CNC Machined Parts

We manufacture custom stainless steel CNC machined parts for demanding industrial applications, using CNC turning, milling, 5-axis machining, and turn-mill processes. We machine grades including 303, 304, 316/316L, 410, 420, and 17-4 PH to meet your required dimensions, tolerances, and surface finishes. From prototypes and low-volume orders to production runs, we provide precision stainless steel components made to your drawings and specifications.

 

Capability	Typical Specification
CNC Processes	CNC Turning, CNC Milling, 5-Axis Machining, Turn-Mill, Swiss CNC
Part Size	Small precision components to large industrial parts
Dimensional Tolerance	Down to ±0.01 mm, depending on part geometry and process
Surface Roughness	Down to Ra 0.8 μm
Materials	303, 304, 304L, 316, 316L, 410, 420, 17-4 PH, 440C
Production Volume	Prototypes, low-volume, and production runs
Inspection	CMM, micrometers, calipers, height gauges, thread gauges
Surface Finishes	As Machined, Brushing, Polishing, Bead Blasting, Passivation, Electropolishing
CAD Formats	STEP, STP, IGES, X-T, DWG, DXF

Get a Quote for Stainless Steel CNC Parts

 

Stainless Steel Grade	Key Properties	Typical CNC Machined Parts
303	Excellent machinability, good corrosion resistance	Shafts, pins, bushings, fittings
304 / 304L	Good corrosion resistance, versatile and widely used	Brackets, housings, plates, fittings
316 / 316L	Excellent corrosion and chemical resistance	Marine parts, valves, fittings, housings
410	High strength, heat treatable, wear resistant	Shafts, gears, machine components
420	High hardness and wear resistance after heat treatment	Precision parts, tooling components
17-4 PH	High strength, hardness, and corrosion resistance	Aerospace, valve, pump, industrial parts
440C	Very high hardness and wear resistance	Bearings, shafts, precision wear parts

 

How to Choose the Right Stainless Steel Grade

Your Requirement	Recommended Grade
Easy CNC machining and fast production	303
General-purpose corrosion resistance	304 / 304L
Marine, chemical, or chloride exposure	316 / 316L
High strength with heat treatment	410 / 420
High strength + corrosion resistance	17-4 PH
High hardness and wear resistance	440C

 

Machining Process	Suitable Stainless Steel Parts	Key Advantages
CNC Turning	Shafts, pins, bushings, sleeves, fittings	High accuracy for cylindrical parts, diameters, threads and grooves
CNC Milling	Brackets, plates, housings, blocks	Precise pockets, slots, holes and complex profiles
5-Axis CNC Machining	Complex housings, impellers, multi-angle components	Fewer setups and efficient machining of complex geometries
CNC Turn-Mill	Complex shafts, connectors, fittings, valve components	Combines turning and milling in a single setup
Swiss CNC Machining	Small pins, screws, shafts and precision components	High precision and efficient production of small parts
CNC Grinding	Precision shafts, pins, hardened components	Tight dimensional tolerances and fine surface finishes

 

Tolerance Item	Typical CNC Capability
Linear Dimensions	±0.01 mm
Hole Diameter	±0.01 mm
Shaft Diameter	±0.01 mm
Position Tolerance	±0.02 mm
Angular Tolerance	±0.05°
Flatness	0.02 mm / 100 mm
Surface Roughness	Ra 0.8–3.2 μm
Thread Tolerance	6H / 6g or as specified
General Tolerance	ISO 2768-m unless otherwise specified

Actual achievable tolerances depend on stainless steel grade, part geometry, dimensions, machining process, and inspection requirements. Tighter tolerances can be reviewed based on your drawings.

 

Have Tight-Tolerance Stainless Steel Parts? Upload Your CAD File →

 

Surface Finish	Typical Result	Suitable Applications
As Machined	Clean CNC tool marks, Ra 0.8–3.2 μm	General industrial components, shafts, brackets
Brushing	Uniform directional satin texture	Housings, panels, equipment components
Polishing	Smooth, bright, reflective surface	Decorative parts, fittings, exposed components
Bead Blasting	Uniform matte, non-directional finish	Housings, brackets, enclosures
Passivation	Removes free iron and improves corrosion resistance	304/316L industrial, food, chemical components
Electropolishing	Smooth, clean, low-contamination surface	316L components, chemical and precision applications

 

Industry / Application	Typical Stainless Steel CNC Parts	Common Grades
Industrial Machinery	Shafts, bushings, brackets, housings, machine components	303, 304, 17-4 PH
Automation Equipment	Precision pins, fixtures, mounting plates, connectors	303, 304, 17-4 PH
Food & Beverage Equipment	Fittings, shafts, housings, valve components	304, 316L
Marine Equipment	Fittings, shafts, brackets, valve components	316, 316L
Oil & Gas Equipment	Valve components, connectors, fittings, pump parts	316L, 17-4 PH
Chemical Processing	Valve parts, fittings, housings, pump components	316L, 17-4 PH
Aerospace Components	Structural components, brackets, precision shafts	17-4 PH, 410
Automotive Components	Shafts, bushings, brackets, connectors	303, 304, 17-4 PH

 

Need Custom Stainless Steel Parts for Your Application? Get a Quote →

 

Quality Control Item	Inspection Method	What We Verify
Material Verification	Material Certificate / PMI	Stainless steel grade, heat number and material compliance
Dimensional Inspection	CMM, Calipers, Micrometers	Overall dimensions, critical features and tolerances
Hole & Bore Inspection	Bore Gauge, Pin Gauge, CMM	Hole diameter, depth and positional accuracy
Thread Inspection	Go/No-Go Thread Gauges	Internal and external thread dimensions
Surface Roughness	Roughness Tester	Specified Ra value and surface consistency
Hardness Testing	Rockwell / Vickers Tester	Hardness requirements for heat-treated grades
Visual Inspection	Visual & Magnified Inspection	Scratches, burrs, dents and surface defects
Final Inspection	Inspection Report	Compliance with drawings, specifications and customer requirements

Quality Documentation Available: Material Test Certificates (MTC), dimensional inspection reports, CMM reports and other quality records can be provided according to project requirements.

 

Request an Inspection Report with Your Stainless Steel CNC Parts →

 

 

Cost Factor	How It Affects Cost
Stainless Steel Grade	303 is generally easier to machine, while 316L, 17-4 PH and hardened grades may require slower cutting and specialized tooling.
Part Geometry	Complex pockets, deep holes, thin walls and undercuts increase programming and machining time.
Part Size	Larger or heavier parts may require more machine capacity, material and machining time.
Machining Time	Longer cycle times, multiple setups and complex tool paths increase the machining cost.
Tolerance Requirements	Tight tolerances require more precise machining, additional inspection and potentially multiple finishing operations.
Surface Finish	Passivation, polishing, bead blasting, brushing and electropolishing add post-machining costs.
Order Quantity	Larger quantities can reduce the unit cost by spreading programming, setup and tooling costs across more parts.
Inspection Requirements	CMM inspection, material verification, hardness testing and detailed inspection reports can increase quality-control costs.
Packaging Requirements	Individual protection, custom packaging and export packaging may affect the final cost.

 

How to Reduce Stainless Steel CNC Machining Costs

Choose a machinable grade: Use 303 when high corrosion resistance is not required; it is generally easier to machine than 304 or 316L.

Avoid unnecessarily tight tolerances: Apply tight tolerances only to critical dimensions instead of the entire part.

Simplify part geometry: Reduce deep pockets, thin walls, undercuts and complex features where the design allows.

Minimize setups: Design parts to be machined in fewer setups whenever possible.

Choose the right surface finish: Specify polishing, passivation or other finishing only when required by the application.

Increase order quantity: Larger production batches can reduce setup and programming costs per part.

Provide complete drawings: A clear 2D drawing, 3D CAD file, material grade and quantity help reduce engineering time and avoid quotation revisions.

Send Your CAD File for an Accurate Stainless Steel CNC Machining Quote 

 

Required Information	What to Provide
3D CAD File	STEP, STP, IGES, X_T or other standard CAD formats
2D Engineering Drawing	Dimensions, tolerances, threads, GD&T and critical features
Material Grade	303, 304, 316L, 17-4 PH, 420, 440C, etc.
Order Quantity	Prototype, sample, low-volume or production quantity
Surface Finish	As Machined, Brushed, Polished, Bead Blasted, Passivated, etc.
Tolerance Requirements	General tolerances and specific critical dimensions
Application	Intended use and operating environment, if relevant
Inspection Requirements	CMM report, material certificate, hardness testing or other requirements
Delivery Requirements	Target delivery date and shipping destination

The more complete your drawing and specifications are, the more accurately we can evaluate machining requirements and provide a quotation.

 

Packaging

Inspection → Individual Protection → PE Bag / Foam → Carton → Wooden Case → Shipping

Packaging Method	Suitable For
PE Bags	Small precision parts and individual protection
Foam / Bubble Wrap	Finished surfaces and delicate components
Cartons	Small and medium production orders
Wooden Cases	Heavy, large or high-value components
Custom Packaging	Parts with special protection or labeling requirements

 

Lead Time

Lead time depends on part complexity, material availability, order quantity, surface finishing, and inspection requirements.

Production Stage	Typical Lead Time
DFM & Quote Review	1–2 business days
Prototype / Simple Parts	5–10 business days
Complex CNC Parts	10–20 business days
Production Orders	2–4 weeks or based on quantity
Surface Finishing & Inspection	Additional time based on requirements
Custom / Urgent Orders	Expedited production available upon request

 

Get a Quote & Lead Time for Your Stainless Steel CNC Parts 

 

1. What stainless steel grades can you CNC machine?

We CNC machine common stainless steel grades including 303, 304, 304L, 316, 316L, 410, 420, 17-4 PH, and 440C.

 

2. Which stainless steel grade is best for CNC machining?

303 is generally preferred when machinability is the priority. 304 is a versatile choice for general applications, while 316L is better for demanding corrosion environments. 17-4 PH is suitable when high strength is required.

 

3. Can you CNC machine 316L stainless steel?

Yes. We can CNC machine 316L stainless steel for fittings, valve components, shafts, housings, marine parts, and chemical-processing components.

 

4. What tolerances can you achieve on stainless steel CNC parts?

Typical CNC tolerances can reach ±0.01 mm for suitable features and part geometries. Tighter tolerances can be reviewed based on the drawing and inspection requirements.

 

5. What surface finishes are available?

Available options include as machined, bead blasting, brushing, polishing, passivation, and electropolishing.

 

6. Can you provide passivation for stainless steel parts?

Yes. Passivation can be provided to improve the corrosion resistance of stainless steel CNC machined parts and remove free iron contamination from the surface.

 

7. Can you manufacture stainless steel prototypes?

Yes. We support prototype, low-volume, and production quantities, allowing designs to be tested before moving into larger production runs.

 

8. How do you inspect stainless steel CNC machined parts?

Inspection can include CMM measurement, micrometer and caliper inspection, thread gauges, surface roughness testing, hardness testing, and visual inspection, depending on project requirements.

 

9. Can you provide material certificates and inspection reports?

Yes. Material certificates, dimensional inspection reports, CMM reports, and other quality documentation can be provided according to project requirements.

 

10. What do you need to quote stainless steel CNC machined parts?

Please provide your 3D CAD file, 2D drawing, stainless steel grade, quantity, tolerances, surface finish, and inspection requirements. These details allow us to evaluate the project and prepare an accurate quotation.

 

11. What is the lead time for stainless steel CNC machined parts?

Typical prototype orders can take around 5–10 business days, while complex or production orders may require 2–4 weeks or longer, depending on quantity, complexity, finishing, and inspection requirements.

 

12. How can I get a quote for custom stainless steel CNC parts?

Upload your CAD file and drawing with the required material grade and quantity. We can review the machining requirements and provide a project-specific quote and lead-time estimate.

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