Stainless Steel CNC Machined Parts — Precision Manufacturing and Global Export from India
Brass Parts India is a trusted manufacturer and exporter of Stainless Steel CNC Machined Parts, supplying high-precision stainless steel components to clients in the USA, UK, Germany, Canada, Australia, and worldwide. Our 30+ years of CNC machining experience, ISO 9001:2015 certified facility, and comprehensive understanding of stainless steel grades make us the preferred source for precision stainless steel turned parts, milled components, and custom machined hardware for demanding industrial applications.
Stainless steel CNC machined parts are essential in food processing, pharmaceutical, medical, marine, aerospace, chemical processing, and architectural sectors where corrosion resistance, strength, and hygiene are non-negotiable. Whether you need a handful of prototypes or tens of thousands of production parts per month, our engineering team and CNC machining centre deliver consistently.
Why Stainless Steel for CNC Machined Components?
Stainless steel CNC machined parts offer: excellent corrosion and oxidation resistance across a wide temperature range, high strength-to-weight ratio, outstanding hygiene and cleanability for food/pharma environments, weldability and fabrication versatility, non-magnetic options (austenitic grades) for sensitive applications, and long service life even in harsh chemical environments. The right stainless steel grade selection is critical — our metallurgists advise on optimal alloy choice for your application.
Stainless Steel Grades for CNC Machined Parts — With International Equivalents
| Grade | UNS (USA) | EN (Europe) | BS (UK) | DIN (Germany) | JIS (Japan) | IS (India) | Best For |
|---|---|---|---|---|---|---|---|
| SS 304 (18/8) | S30400 | 1.4301 / X5CrNi18-10 | 304 S 15 | 1.4301 | SUS304 | IS 6911 Gr. 04Cr18Ni10 | General purpose, food, industrial |
| SS 316 / 316L | S31600 / S31603 | 1.4401 / 1.4404 | 316 S 16 / 316 S 12 | 1.4401 | SUS316 / SUS316L | IS 6911 Gr. 07Cr17Ni12Mo2 | Marine, chemical, pharmaceutical |
| SS 303 (Free-Machining) | S30300 | 1.4305 / X8CrNiS18-9 | 303 S 21 | 1.4305 | SUS303 | — | High-volume CNC turning, connectors |
| SS 316F (Free-Machining) | S31620 | 1.4406 | — | — | — | — | CNC turning in corrosive environments |
| SS 430 (Ferritic) | S43000 | 1.4016 / X6Cr17 | 430 S 17 | 1.4016 | SUS430 | — | Decorative, automotive trim |
| SS 440C (Martensitic) | S44004 | 1.4125 / X105CrMo17 | 441 S 49 | 1.4125 | SUS440C | — | Bearings, valves, cutting tools |
| Duplex SS 2205 | S32205 | 1.4462 / X2CrNiMoN22-5-3 | — | 1.4462 | SUS329J3L | — | High-pressure, oil & gas, marine |
| SS 17-4 PH | S17400 | 1.4542 / X5CrNiCuNb16-4 | — | 1.4542 | SUS630 | — | Aerospace, high-strength, shafts |
Types of Stainless Steel CNC Machined Parts We Produce
- Stainless Steel CNC Turned Parts: Studs, pins, shafts, bushings, sleeves, nozzles, valve stems, connector bodies
- Stainless Steel CNC Milled Parts: Brackets, plates, housings, enclosures, manifolds, block components
- Stainless Steel Fasteners (Machined): Precision screws, nuts, bolts, standoffs, inserts, custom fasteners
- Stainless Steel Valve Components: Ball valve balls, valve stems, valve seats, gate valve parts, check valve bodies
- Stainless Steel Fittings: Nipples, unions, couplings, adapters, reducers in SS 316/304
- Stainless Steel Medical Components: Surgical instrument parts, implant tooling, dental components, endoscope parts
- Stainless Steel Food-Grade Parts: Mixer paddles, pump impellers, food valve components, dairy fittings
- Stainless Steel Marine Hardware: Shaft couplings, porthole fittings, through-hull hardware in SS 316L
- Stainless Steel Instrumentation Parts: Gauge bodies, sensor housings, pressure fitting components, flow meter parts
- Custom Stainless Steel Machined Parts: Any precision SS component from your 2D/3D drawing
Our Technical Expertise in Stainless Steel CNC Machining
Stainless steel is notoriously challenging to machine — its work-hardening tendency, low thermal conductivity, and high toughness demand specialised tooling, optimised cutting parameters, and experienced machinists. Brass Parts India has developed proven processes for all major stainless steel grades:
- CNC Turning (2–5 axis): Multi-axis turning for complex SS turned parts — cross-holes, live tooling operations, eccentric features
- Swiss-type Precision Turning: Small-diameter stainless steel turned parts from ∅0.5 mm to ∅30 mm in SS 303, SS 316
- CNC Milling (VMC/HMC): Stainless steel prismatic components, housings, brackets with tolerances to ±0.01 mm
- 5-Axis CNC Machining: Complex stainless steel aerospace and medical components in single setups
- EDM (Wire and Sink): Complex forms and fine details in hardened SS — SS 440C, 17-4 PH
- Grinding (Surface and Cylindrical): Precision SS shafts and bearing surfaces to Ra 0.4 µm and h6/h7 tolerances
- Passivation: ASTM A967 / AMS 2700 passivation for all stainless steel machined parts to maximise corrosion resistance
- Electropolishing: Bright, ultra-smooth surface finish for pharmaceutical and medical stainless steel components
Dimensional Size Chart — Stainless Steel CNC Machined Parts
| Component Type | Diameter / Size Range | Length Range | Thread Options | Tolerance | Surface Finish |
|---|---|---|---|---|---|
| SS CNC Turned Studs & Pins | ∅1 mm – ∅80 mm | 5 mm – 500 mm | BSP, NPT, UNC, Metric | ±0.01 mm | As machined / Passivated |
| SS Bushings & Sleeves | ∅4 mm – ∅100 mm | 5 mm – 200 mm | Internal/External | ±0.005 mm (bore) | As machined / Ground |
| SS Valve Bodies & Balls | ∅10 mm – ∅100 mm | 20 mm – 200 mm | BSP, NPT, Metric | ±0.02 mm | Electropolished |
| SS CNC Milled Brackets | Up to 400 mm × 400 mm | 5 mm – 100 mm thick | Tapped holes M3–M36 | ±0.05 mm | Blasted / Passivated |
| SS Medical Components | ∅0.5 mm – ∅50 mm | Per drawing | Per specification | ±0.005 mm | Electropolished / Ra <0.4 µm |
| SS Custom Complex Parts | Any (per drawing) | Per drawing | Per specification | Per drawing | Per requirement |
Performance Metrics — Stainless Steel CNC Machined Parts
- Corrosion Resistance (SS 316L): Excellent resistance to chlorides, acids, and marine environments — outperforms SS 304 in saline environments
- Tensile Strength (SS 304 annealed): 515–620 MPa
- Tensile Strength (17-4 PH H900): Up to 1310 MPa
- Hardness (SS 303 annealed): Approx. 160–200 HB
- Operating Temperature (SS 316L): –196°C to +870°C (intermittent)
- Dimensional Tolerance: ±0.01 mm standard; ±0.005 mm precision
- Surface Roughness: Ra 0.8 µm (turned); Ra 0.4 µm (ground); Ra <0.1 µm (electropolished)
- Lead Time: 4–6 weeks standard; 2–3 weeks prototypes
- MOQ: No rigid minimum — prototype to mass production volumes
- Quality: ISO 9001:2015; ASTM, BS EN, DIN compliant material; passivation to ASTM A967
Why Choose Brass Parts India for Stainless Steel CNC Machined Parts?
- 30+ Years of Precision Machining Experience: We have machined stainless steel components for pharmaceutical, food, marine, chemical, and industrial sectors for over three decades. Our knowledge of SS machining challenges — work hardening, tool wear, heat generation — ensures defect-free parts every time.
- Faster Turnaround than Most Competitors: Vertical integration of CNC machining, grinding, passivation, and electropolishing under one roof means no external dependency — and faster turnaround for your stainless steel CNC parts.
- All Major SS Grades Stocked: We maintain inventory of SS 303, SS 304, SS 316/316L bar, SS 440C, SS 17-4 PH, and Duplex SS 2205 — enabling fast start of production without material sourcing delays.
- Global Regulatory Knowledge: Food-grade (FDA 21 CFR), pharmaceutical (GMP), medical device (ISO 13485-aligned quality), and marine (ABS, DNV) documentation requirements are well understood by our team.
- Better Communication: Our sales and engineering team communicates in clear, technical English. We respond to RFQs within 24 hours, provide DFM feedback, and offer production tracking — differentiating us from many Asian suppliers.
- Competitive Cost Base: India’s skilled manufacturing workforce and cost-effective supply chain deliver globally competitive pricing — typically 25–40% below European or North American equivalent quality.
- ISO 9001:2015 Certified Quality: Rigorous material traceability, in-process inspection, and final dimensional verification using CMM, optical comparators, and surface roughness testers.
What Separates Us from Other Stainless Steel Machined Parts Manufacturers
- We hold stock of multiple stainless steel grades including the less-common SS 303F (free-machining SS 316 variant), SS 440C, and 17-4 PH precipitation hardening SS — not just the standard grades
- Our in-house passivation and electropolishing capability eliminates the outsourcing bottleneck that adds 1–2 weeks to many competitors’ lead times
- We understand medical device supply chain requirements and can work with your vendor qualification process (VQP), including submission of material and process documentation
- 5-axis CNC machining for complex aerospace and medical SS components — many suppliers lack this capability
- We do not outsource any core machining operations — all work is done in-house at our Jamnagar facility
Our Flexibility to Customize Stainless Steel CNC Parts
Brass Parts India offers complete customisation of stainless steel CNC machined parts: alloy grade selection (SS 303, 304, 316, 316L, 316F, 440C, 17-4 PH, Duplex 2205); any tolerance class from standard (±0.05 mm) to ultra-precision (±0.005 mm); any thread form (BSP, NPT, UNC, UNF, ISO metric, custom); any surface treatment (passivation, electropolishing, bead blasting, satin finish, PVD coating); custom marking (laser engraving, stamping); and custom packaging for cleanroom, medical, or food-grade applications. We work from your 2D drawing, 3D STEP file, or physical sample.
Export-Worthy Packaging Standards
Stainless steel machined parts require protective packaging to prevent scratching, contamination, and moisture damage during international transit. Brass Parts India’s export packaging for stainless steel parts includes: individual wrapping in soft poly film or foam pouches for precision parts, compartmented partitioned trays for multiple small components, bubble wrap or foam inserts for fragile or complex parts, double-wall corrugated export cartons with corner protection, VCI desiccant sachets to prevent flash rust on any exposed steel surfaces, comprehensive labelling (part number, revision, heat number, quantity), and full documentation: packing list, CoC, MTC with EN 10204 3.1 cert, RoHS declaration, passivation certificate (ASTM A967), and inspection report.
Customer Testimonials
“We’ve sourced stainless steel CNC turned valve components from Brass Parts India for our pharmaceutical process equipment line for two years. Their SS 316L parts are machined to specification, passivation certificates are always included, and every delivery has arrived on time and perfectly packed. Communication is excellent — they always keep us updated.”
— Liam O’Sullivan, Procurement Manager, Australia
“Brass Parts India delivered a batch of 5-axis machined SS 17-4 PH aerospace component prototypes that were geometrically perfect. Their DFM suggestions saved us 15% on unit cost, and their material documentation package met our full vendor qualification requirements. We are now in production with them.”
— Ingrid Hauser, Senior Buyer, Germany
Typical Q&A — Stainless Steel CNC Machined Parts
1. What is the best stainless steel grade for CNC turning?
SS 303 is the best free-machining stainless steel for CNC turning, with machinability approximately 50–55% of C36000 brass. For applications requiring better corrosion resistance (especially marine/chemical), SS 316F (free-machining variant of SS 316) is preferred. SS 304 and SS 316 can also be turned but require slower speeds and sharper tooling.
2. What is the difference between SS 304 and SS 316?
SS 304 (1.4301) is the standard austenitic stainless steel offering good general corrosion resistance at lower cost. SS 316 (1.4401) adds 2–3% molybdenum, giving it significantly superior resistance to chlorides (seawater, acids, chlorine) and pitting corrosion. SS 316L is the low-carbon variant preferred for welding applications.
3. Do you supply passivation certificates for SS machined parts?
Yes. All stainless steel CNC machined parts can be supplied with passivation per ASTM A967 (USA) or ASTM A380. We provide a passivation certificate confirming the treatment process and compliance. Electropolishing is also available for medical and pharmaceutical grade parts.
4. Can you machine Duplex Stainless Steel (SS 2205)?
Yes. We machine Duplex Stainless Steel (S32205 / 1.4462) for oil and gas, subsea, and high-pressure applications. Duplex SS requires careful control of cutting parameters due to its higher hardness — our experienced team has established processes for consistent duplex SS machined parts.
5. What tolerances can you achieve on SS CNC turned parts?
Standard tolerance: ±0.02 mm on turned diameters. Precision: ±0.01 mm. Ultra-precision (with grinding): ±0.005 mm. We use Mitutoyo CMM and calibrated micrometers for dimensional verification.
6. Can you supply stainless steel parts for food and pharmaceutical applications?
Yes. We manufacture food-grade SS 316L machined parts with electropolished surfaces (Ra <0.4 µm), passivated per ASTM A967, and packaged in cleanroom-style individual poly bags. Material test certificates confirm compliance with FDA 21 CFR Part 177 and EU 1935/2004 food contact material regulations.
7. What is electropolishing and when is it required?
Electropolishing is an electrochemical surface finishing process that removes a thin surface layer from stainless steel, producing an ultra-smooth, bright, and highly corrosion-resistant surface (Ra typically <0.1 µm). It is required for pharmaceutical, medical, and semiconductor stainless steel machined parts where surface cleanliness and hygienic properties are critical.
8. What is the lead time for stainless steel CNC machined parts?
Standard production lead time: 4–6 weeks from drawing approval and advance payment. Prototypes: 2–3 weeks. Complex multi-operation parts (requiring 5-axis machining + grinding + passivation): 5–7 weeks. Rush orders can be accommodated on request.
9. Can you supply stainless steel machined parts for marine applications?
Yes. We regularly supply SS 316L and SS 316 machined marine hardware — shaft fittings, deck hardware, through-hull fittings, and valve components — to marine OEMs in the UK, Australia, USA, and Europe. Material and mill certificates confirming EN 10088 / ASTM A276 compliance are standard.
10. Are your SS machined parts RoHS and REACH compliant?
Yes. Our stainless steel alloys contain no RoHS-restricted substances. We supply RoHS 2 and REACH SVHC compliance declarations with all stainless steel CNC machined parts, along with MSDS/SDS sheets for the alloys used.
11. What is 17-4 PH stainless steel?
17-4 PH (S17400 / 1.4542) is a precipitation-hardening (PH) stainless steel containing 17% chromium, 4% nickel, and 4% copper. After ageing heat treatment, it achieves tensile strengths up to 1310 MPa (Condition H900) while maintaining good corrosion resistance. It is widely used in aerospace, defence, and high-performance mechanical applications.
12. Can you machine SS 440C for bearing and valve components?
Yes. We machine SS 440C (1.4125 / S44004) — the highest-carbon martensitic stainless steel — for bearing balls, valve seats, surgical instrument parts, and wear-resistant components. SS 440C achieves Rockwell hardness up to HRC 58–60 after hardening and tempering.
13. Do you have 5-axis CNC machining for complex SS parts?
Yes. Our 5-axis CNC machining centres enable complex stainless steel aerospace and medical components to be machined in a single setup, reducing datum errors and improving geometric accuracy. 5-axis is essential for medical implant tooling, aerospace structural parts, and complex valve bodies.
14. What certification do you hold for medical stainless steel parts?
Brass Parts India is ISO 9001:2015 certified. For medical device customers, we provide comprehensive documentation including material EN 10204 3.1 certificates, first article inspection reports, process validation records, and can work within your ISO 13485-aligned vendor qualification process. We do not hold ISO 13485 certification ourselves but supply many ISO 13485-certified OEMs.
15. What is the minimum order for stainless steel CNC machined parts?
We have no rigid minimum order quantity. We manufacture prototype quantities from 1–50 pieces as well as high-volume production orders. We provide break-pricing showing the per-piece cost at quantities of 100, 500, 1000, 5000, and 10,000+ pieces so you can plan your supply chain economically.
16. Do you provide material traceability for stainless steel machined parts?
Yes. Full material traceability from mill certificate to finished part is maintained for every batch of stainless steel CNC machined parts. We provide EN 10204 3.1 (or 3.2 on request) mill test certificates with every shipment, along with our own inspection certificate referencing the material batch and heat number.
Glossary of Related Terms — Stainless Steel CNC Machining
Passivation: Chemical treatment (nitric or citric acid) to restore native chromium oxide layer and maximise corrosion resistance of stainless steel. Electropolishing: Electrochemical surface finishing producing ultra-smooth, corrosion-resistant stainless steel surfaces. Duplex SS: Austenitic-ferritic stainless steel with superior strength and chloride resistance. 17-4 PH: Precipitation-hardening stainless steel with very high strength after age hardening. Work Hardening: Rapid increase in hardness of austenitic SS during machining — requires sharp tools and proper parameters. EN 10204 3.1: European standard for material test certificates issued by the manufacturer. ASTM A967: US standard for passivation of stainless steel parts. GMP: Good Manufacturing Practice — regulatory standard for pharmaceutical/food manufacturing. CMM: Coordinate Measuring Machine — precision dimensional inspection tool. DFM: Design for Manufacturability — review of designs to optimise for production.
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Request a Quote — Stainless Steel CNC Machined Parts
If you need precision stainless steel CNC machined parts manufactured to international standards with fast turnaround and excellent communication, Brass Parts India is your ideal manufacturing partner.
Contact us today:
- Email: sales@brass-parts-india.com
- Phone: +91 22 43 44 9300
- Upload your technical drawing via our Request a Quote form — receive a quotation within 24–48 hours
Join our global customer base in USA, UK, Germany, Australia, and Canada who trust Brass Parts India for consistent quality stainless steel CNC machined parts, on-time delivery, and the level of technical communication and support you expect from a world-class precision manufacturing partner.
