Stainless Steel 316 Parts, Components & CNC Machined SS 316

Jamnagar Brass Components is a leading manufacturer of Stainless Steel 316 parts and CNC machined SS 316 components serving US, European, and global industrial buyers. SS 316 is the premium-grade austenitic stainless steel offering superior corrosion resistance, particularly in chloride-rich and acidic environments. We produce custom SS 316 components from precision CNC turning and milling operations, supplying industries such as marine engineering, chemical processing, offshore oil and gas, pharmaceutical, and high-purity food processing.

Why Stainless Steel 316 Over Other Grades?

The key differentiator of SS 316 is the addition of 2–3% molybdenum to the standard 18/8 chromium-nickel formula. This molybdenum addition dramatically improves resistance to pitting and crevice corrosion caused by chlorides — making SS 316 the mandated choice for seawater-exposed hardware, chlorinated process equipment, medical implants, and coastal architectural applications. Where SS 304 may suffer pitting in salty or acidic conditions, SS 316 maintains its integrity.

SS 316 Material Grades — International Equivalents

Standard	Grade Designation	Region
UNS (ASTM)	S31600	USA
EN / DIN	1.4401 (X5CrNiMo17-12-2)	Europe
BS	316 S31	UK
JIS	SUS 316	Japan
IS	04Cr17Ni12Mo2	India
316L (low carbon)	S31603 / 1.4404	USA / Europe

CNC Machined Stainless Steel 316 Components We Manufacture

SS 316 Valve Bodies and Fittings

We machine ball valve bodies, globe valve bodies, check valve housings, and associated fitting components in SS 316 and 316L for chemical, oil and gas, and marine clients. All machined to ASME B16.34 or customer-specific requirements.

SS 316 Turned Shafts, Bushings, and Spacers

High-precision CNC turned components in SS 316 — shafts, bushings, spacers, standoffs, and plugs — with tight diametral tolerances (h6, h7, H7) for pump, marine, and food equipment assemblies.

SS 316 Flanges and Manifolds

Custom-machined flanges to ASME B16.5 and DIN 2632/2633 standards in SS 316 and 316L bar stock, including blind flanges, weld neck, slip-on, and threaded configurations.

SS 316 Fasteners and Threaded Components

Custom bolts, cap screws, studs, nuts, and threaded inserts in SS 316 machined to ASME B18 or DIN specifications. Available in UNC, UNF, Metric coarse, and metric fine threads.

SS 316 Pharmaceutical and Hygienic Components

Sanitary fittings, clamp ferrules, tri-clover ends, and instrument components in 316L SS with electro-polished surface finish, Ra ≤ 0.4 µm, conforming to 3-A Sanitary Standards and FDA-compliant requirements.

Applications of Stainless Steel 316 Parts

• Marine hardware and offshore platform equipment
• Chemical process plant fittings and pump components
• Pharmaceutical equipment and hygienic clamp fittings
• Desalination plant components
• Medical implants and surgical instruments
• Coastal and saltwater architectural fixtures
• High-temperature furnace components (SS 316H)
• Pulp and paper mill equipment

Why Choose Jamnagar Brass Components for SS 316 Parts?

• ISO 9001:2015 Certified Manufacturer — full traceability and documentation on every order
• ASTM / EN certified raw material — MTC supplied with every shipment
• 316 and 316L variants — low-carbon grade available for weld-critical applications
• Complex geometry capability — 4-axis and 5-axis machining for intricate components
• Electro-polishing and passivation — ASTM A967 passivation for corrosion-critical parts
• DFM support — design-for-manufacturability advice to reduce cost and lead time
• Flexible MOQ — from prototype (1 pc) to production runs of 50,000+ pcs
• US-focused export — familiar with ITAR, REACH, RoHS documentation for US customers

Frequently Asked Questions — SS 316 Parts

Q1: What is the difference between SS 316 and SS 316L?

SS 316L is the low-carbon variant of SS 316, with a maximum carbon content of 0.03% vs. 0.08% for standard 316. The reduced carbon prevents carbide precipitation (sensitisation) at grain boundaries during welding, making 316L mandatory for welded assemblies exposed to corrosive environments. For non-welded machined parts, the performance of 316 and 316L is essentially identical.

Q2: Is SS 316 suitable for seawater and marine applications?

Yes. SS 316 offers significantly better resistance to seawater and salt air than SS 304, due to the molybdenum addition (2–3%). It is widely used for marine hardware, boat deck fittings, offshore platform components, and coastal architectural fixtures. For deep immersion or high-velocity seawater (above 25 °C), super duplex stainless (2507) or titanium may be more appropriate.

Q3: What ASTM standards apply to SS 316 bar and machined parts?

Key ASTM standards for SS 316 include: ASTM A276/A276M (bar and shapes), ASTM A479/A479M (bar for pressure vessel use), ASTM A312 (seamless pipe), and ASTM A554 (welded tubing). For European projects, EN 10088-3 covers grade 1.4401 (316) and 1.4404 (316L) bar. We supply material per any of these standards with full MTC documentation.

Q4: Can you supply SS 316 components with passivation certificates?

Yes. All SS 316 machined parts can be supplied passivated per ASTM A967 using either citric acid (preferred, environmentally friendly) or nitric acid processes. We provide a passivation certificate with each treated batch, confirming the process used, solution concentration, temperature, and exposure time per ASTM A967 requirements.

Q5: What tolerances can you hold on SS 316 CNC machined parts?

In production, we routinely hold ±0.01 mm on turned diameters, ±0.02 mm on bored holes, and ±0.05 mm on milled profiles. For precision-ground SS 316 components, IT5/IT6 tolerance class is achievable. Surface roughness Ra 0.8 µm is standard on turned bores; Ra 0.4 µm is achievable with fine boring or honing.

Q6: What is the cost difference between SS 316 and SS 304 parts?

SS 316 raw material typically costs 15–30% more than SS 304 due to the molybdenum addition. For machined components, the additional material cost is diluted by the machining cost, so the final part price is usually 10–20% higher for identical geometry. If the application truly requires 316-grade corrosion resistance, this premium is well justified by longer service life.

Q7: Do you supply SS 316 pharmaceutical and 3-A sanitary fittings?

Yes. We manufacture SS 316L sanitary fittings — clamp ferrules, tees, elbows, and valve components — with electro-polished surfaces (Ra ≤ 0.8 µm or ≤ 0.4 µm internal), conforming to 3-A Sanitary Standards and USP Class VI material requirements. Full documentation for FDA and EHEDG compliance is available.

Q8: Can you provide SS 316 flanges to ASME B16.5?

Yes. We machine custom flanges in SS 316 and 316L bar to ASME B16.5 pressure ratings (150#, 300#, 600#) and face types (raised face, flat face, RTJ). Available in weld neck, slip-on, blind, and threaded configurations in sizes from ½ inch NPS to 12 inch NPS. Larger custom flanges can be quoted on enquiry.

Q9: What is the maximum service temperature for SS 316?

SS 316 can be used continuously up to 870 °C in non-cyclic oxidising conditions and intermittently to 925 °C. For continuous service above 500 °C where weld zones are involved, SS 316L is preferred to prevent sensitisation. For very high temperature applications (>950 °C), 310S or 253MA alloys are more appropriate than standard 316.

Q10: What is the lead time for SS 316 machined parts?

Lead times depend on complexity and quantity. Standard turned or milled parts in stock bar sizes: 3–4 weeks for production quantities (post first-article approval). Complex multi-axis parts: 4–6 weeks. Rush orders can be accommodated in 10–15 working days at a premium. Prototype/sample orders: typically 7–10 working days.