Stainless Steel CNC Machining Services
We deliver custom stainless steel CNC machining with flexible OEM & ODM, assorted steel grades and full surface finishes. Prototypes in 3 days, small batches in 7 days; 100% inspection, free defect replacement plus full RoHS and dimensional certification.
- Competitive Prices & DFM
- Tolerances up to ±0.01 mm
- 3-axis, 4-axis, and 5-axis CNC machining
- Parts delivered in as fast as 3 days
Verify Certifications On Demand：ISO 9001:2015 | IATF 16949:2016
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Stainless Steel in CNC Machining
Stainless steel CNC machining produces high-precision, corrosion-resistant components widely used across multiple industries, such as aerospace engine parts, automotive exhaust fittings, medical surgical instruments, food machinery parts, architectural accessories and electronic enclosures.
ZH Precision offers stainless steel CNC machining, milling and turning for intricate structural components. With full-spectrum CNC equipment, we fabricate custom parts efficiently and supply complete inspection documents including FAI, full dimensional, material and surface finish test reports.
Available surface treatments cover polishing, sandblasting, plating, passivation and coloring. These processes upgrade part appearance, anti-corrosion property and practical performance to satisfy strict industry specifications.
CNC Machining Capability in Stainless Steel
| Feature | Detail |
|---|---|
| General Tolerances | ±0.01 mm |
| Max Size - Milling | 4000 mm×1500 mm×600 mm |
| Max Size - Turning | 200 mm×500 mm |
| Hole Diameters (Not Reamed) | ±0.02 mm |
| Minimum Wall Thickness | 0.75 mm |
| Standard Lead Time | 3 business days |
| Small Batch Lead Time | 7-10 business days |
| Mass Production Lead Time | 25 business days |
SUS201 stainless steel is an economical stainless grade for CNC machining. It has moderate corrosion resistance and excellent formability at low cost, commonly used for standard mechanical accessories, equipment housings, architectural decoration and general industrial structural parts.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 275~345 | 105~130 | 40~55 | ≤207 | 7.93 |
SUS303 is a free-cutting stainless steel optimized for high-speed CNC turning and milling. With excellent machinability and moderate corrosion resistance, it is widely used for precision fasteners, shaft pins, valve components, instrumentation fittings and small mechanical spare parts.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 205~310 | 130~180 | 40~55 | ≤187 | 7.98 |
SUS304 is the most versatile austenitic stainless steel for CNC machining. It delivers outstanding corrosion resistance, good ductility and balanced machinability, widely used for food equipment parts, medical fittings, pump housings, automotive components and general precision industrial parts.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 205~310 | 135~195 | 50~65 | ≤187 | 7.93 |
SUS316 stainless steel contains molybdenum for superior chloride and acid corrosion resistance compared to 304. It features stable mechanical performance and reliable durability, ideal for marine parts, chemical equipment, medical hardware and corrosive-environment precision components.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 205~310 | 145~205 | 50~65 | ≤187 | 7.98 |
SUS316L is low-carbon molybdenum-containing austenitic stainless steel with outstanding chloride and acid corrosion resistance. Low carbon content avoids intergranular corrosion after welding; excellent biocompatibility and mechanical stability make it ideal for medical parts, marine fittings, chemical valves and food machinery components.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 205~270 | 140~200 | 55~65 | ≤187 | 7.98 |
SUS420 is martensitic stainless steel with high hardness after heat treatment, great wear resistance and moderate anti-rust capacity. It is commonly machined for cutting tools, bearing parts, valve cores, medical instrument components and mold accessories requiring high surface hardness.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 345~540 | 180~260 | 12~25 | 190~260 | 7.75 |
SUS430 is common ferritic stainless steel with low cost, good polishing performance and decent atmospheric corrosion resistance. Without nickel composition, it is widely used for home appliance fittings, decorative parts, kitchen hardware and low-load general mechanical components.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 205~275 | 130~190 | 22~35 | 140~185 | 7.75 |
SUS431 is martensitic stainless steel with nickel addition, featuring high tensile strength, outstanding toughness and better corrosion resistance than regular 420 grade. After heat treatment, it gains excellent wear resistance, commonly used for high-strength shafts, pump shafts, valve spindles, aerospace fasteners and heavy-load mechanical components.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 880~1300 | 450~600 | 10~15 | 241~302 | 7.75 |
SUS440C is high-carbon martensitic stainless steel famous for ultra-high hardness after quenching & tempering. It owns superior wear resistance and moderate corrosion resistance, widely applied for bearing parts, cutting inserts, precision shafts, mold pins and wear-resistant mechanical fittings.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 750~1250 | 380~520 | 2~8 | 255~320 | 7.78 |
SUS630 (17-4PH) is precipitation hardening stainless steel. It can achieve high strength and hardness via aging treatment while retaining good corrosion resistance, ideal for aerospace parts, oil & gas fittings, medical components, high-pressure valve parts and precision machinery requiring high mechanical performance.
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm³) |
|---|---|---|---|---|
| 725~1180 | 360~530 | 6~18 | 260~380 | 7.80 |
Instant & Accurate Quotes
Every aluminum CNC design gets a free DFM review. Get accurate, no-hidden-cost quotations from our machining engineers within 6 hours.
Surface Finishing Options for Stainless Steel
A full range of industrial surface modification processes including as-machined, anodizing, mechanical polishing and sand blasting can be supplied to adjust stainless steel surface roughness, topography and corrosion performance in strict accordance with finish specifications marked on engineering drawings. View surface finishing options →
As Machined
Original CNC cutting texture is fully retained without any extra post-processing for parts with loose surface appearance standards.
Anodizing
Compact protective oxide layer is generated on substrate to effectively upgrade surface wear resistance and anti-corrosion capability.
Polishing
Surface tool traces and tiny flaws are eliminated to acquire low-Ra smooth finish for appearance and sanitary critical components.
Sand Blasting
Consistent matte surface is produced to eliminate machining lines and enhance bonding strength for follow-up coating operations.
What Is Stainless Steel CNC Machining?
Stainless steel CNC machining is a precision subtractive manufacturing process that adopts numerically controlled milling, turning and 5-axis machining equipment to remove surplus material from solid stainless steel blanks. Fabrication is executed fully based on CAD drawings with tight tolerance management to guarantee accurate size and geometric precision of custom machined components.
The finished parts keep stainless steel’s intrinsic corrosion resistance, high tensile strength and oxidation resistance intact after machining. Benefited from these stable material properties, this processing technology is extensively applied to produce critical precision components for medical equipment, automotive fittings, food machinery and automated industrial systems.
Advantages of Stainless Steel CNC Machining
1.Superior dimensional accuracy: Multi-axis CNC equipment enables tight tolerance control and precise forming of intricate contours per CAD specifications.
2.Preserved material performance: Original corrosion resistance, tensile strength and oxidation resistance of stainless steel remain unchanged after cutting.
3.Strong environmental adaptability: Finished parts withstand moisture, acid and salt erosion, suited for harsh working conditions.
4.Flexible customization: Supports small-batch and prototype production with adjustable dimensions to match diverse industry drawing requirements.
5.Compatibility with post-treatment: Easy to implement polishing, sandblasting and other surface finishes to upgrade appearance and service performance.
Applications of Stainless Steel CNC Machining
1.Medical equipment: Process surgical accessories, instrument shells and sanitary structural parts meeting medical anti-corrosion and hygiene criteria.
2.Automotive industry: Manufacture engine accessories, sensor shells and precision brake components for vehicle assembly.
3.Industrial equipment: Produce valve bodies, pump fittings and transmission parts resistant to industrial fluid and chemical medium corrosion.
4.Industrial automation: Customize precision shafts, clamps and fluid control components for automated production equipment.
5.Precision instrumentation & aerospace: Supply high-stability small parts with rigorous tolerance and anti-oxidation requirements.
Frequently Asked Questions
A: Main applicable grades include 303, 304 and 316 stainless steel. 303 features superior machinability; 304 balances cost and corrosion resistance; 316 delivers excellent anti-corrosion performance for harsh chemical and humid environments.
A: Standard dimensional tolerance reaches ±0.02mm, and critical features can be controlled within ±0.005mm based on drawing requirements via 5-axis precision CNC equipment.
A: Stainless steel has high toughness and work-hardening characteristics, which easily leads to cutter abrasion. Optimized cutting parameters and dedicated carbide cutters are adopted to reduce tool loss.
A: Not required by default. Parts can keep as-machined raw surface; polishing, sandblasting or passivation are optional per drawing specifications to improve corrosion resistance and surface roughness.
A:Yes. CNC machining fits flexible production ranging from single prototype, small trial batches to mass volume production with quick program adjustment for design revisions.
A:Primary difficulties derive from stainless steel’s high ductility and cold work hardening tendency, prone to built-up edge on cutting tools and poor chip breaking. Its low thermal conductivity concentrates cutting heat at tool tip, accelerating tool abrasion and affecting dimensional stability, which demands specialized cutting tools and optimized cutting speeds.