Are you looking for premium quality SS fasteners than you are at the right place. We Stainless Bolt Industries, we are a prominent manufacturer and supplier of good quality SS fasteners in Chennai. The Industrial baseline of Chennai is one of the most varied in South India. It has Automobile manufacturing plants, petrochemical industries, heavy engineering, port and marine infrastructure, and a growing defence and aerospace sector.
Each has a specific fastener need, and most of them converge on stainless steel as the material of choice for corrosion-critical joints. We provide SS hex bolts, nuts, and screws in SS 304 and SS 316 to buyers across Chennai, Sriperumbudur, Manali, and the broader Tamil Nadu industrial corridor.
Chennai’s Bay of Bengal coast means chloride exposure is a real engineering consideration for any installation within several kilometres of the shoreline. The Ennore and Manali industrial zones, both of which sit near the coast, are exactly where the 304 vs 316 decision matters most. We stock both and supply with full certification.
SS Hex Bolts in Chennai
Petrochemical plant assembly in Manali, structural bolting in Chennai’s infrastructure projects, automobile component assembly in Sriperumbudur, and marine installations at Ennore Port are the primary hex bolt applications in this market. ASTM A193 B8M in SS 316 for flanged process connections and DIN 933 in SS 304 for general structural work cover most requirements here.
Available Types:
- Fully threaded hex bolts
- Partially threaded hex bolts (hex cap screws)
- Heavy hex bolts for structural application
Sizes and Standards:
- Metric: M6 to M100 | Inch: 1/4″ to 4″
- Standards: ASTM A193, DIN 933, DIN 931, ISO 4014, ISO 4017
SS Hex Nuts in Chennai
Matched-grade nuts are essential for certified flange assemblies. CPCL and other refinery operators in Manali specify ASTM A194 8M heavy hex nuts for high-temperature and high-pressure line connections. Standard hex nuts in 304 and 316 are stocked for auto industry and general industrial applications.
Available Types:
- Standard hex nuts (DIN 934 / ISO 4032)
- Heavy hex nuts (ASTM A194)
- Coupling nuts
- Nylon insert lock nuts (SS hex nyloc)
- Flange nuts
Size Range and Standards:
- Sizes: M4 to M100 | 1/4″ to 4″
- Standards: ASTM A194 2H & 8M, DIN 934, ISO 4032
SS Screws in Chennai
Auto component manufacturers and tier-1 suppliers in Sriperumbudur use SS 304 machine screws and socket cap screws for fixture and tooling assembly. HVAC contractors working on Chennai’s commercial developments specify SS 304 self-tapping screws. Food processing and seafood export units near Kasimedu and Royapuram specify SS 316 for equipment in food-contact environments.
Available Types:
- Self-tapping screws (pan head, countersunk, hex washer head)
- Machine screws (pan, CSK, round head Phillips and slotted)
- Hex head self-drilling screws (tek screws)
- Socket cap screws (Allen screws)
- Set screws (grub screws)
Size Range and Standards:
- Sizes: M3 to M20 | #6 to 3/4″ (inch)
- Standards: DIN 7981, DIN 965, DIN 912, ISO 1481
SS 304 vs SS 316 Fasteners
| Feature | SS 304 Fasteners | SS 316 Fasteners |
| Composition | 18% Chromium, 8% Nickel | 16% Cr, 10% Ni, 2% Molybdenum |
| Coastal Resistance | Limited not for near-shore use | Preferred for coastal Chennai sites |
| Chemical Resistance | Moderate | High suitable for Manali petrochemical zone |
| Cost | Lower | Approx. 20–30% higher than 304 |
| Best for Chennai | Auto sector, inland construction, HVAC | Petrochemical, marine, food processing, ports |
Applications across Chennai's Sectors:
Automotive The auto manufacturing corridor west of Chennai is one of the densest in India. Jig and fixture assembly, process equipment installation, and tooling for OEM and tier-1 auto parts manufacturers consume SS 304 hex bolts, machine screws, and socket cap screws in large quantities. Dimensional accuracy and consistent grade are mandatory in this sector.
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Petrochemical and Refinery CPCL and associated process plants in Manali operate high-temperature, high-pressure pipelines where ASTM A193 B8M bolts with A194 8M nuts are the minimum specification. Chloride proximity from the coast makes SS 316 the only defensible choice for external fittings and structural connections at these sites.
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Port and Marine Kamarajar Port and Chennai Port infrastructure jetties, cargo handling equipment, marine structures specify SS 316 as the baseline for any fastener in the marine splash zone. We supply with full EN 10204 3.1 documentation for port authority acceptance.
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Food Processing and Seafood Export Chennai’s seafood processing and export units operate under HACCP and export certifications requiring SS 316 for all equipment contact fasteners. Cold storage fittings, conveyor assemblies, and processing equipment all use 316 for corrosion resistance against both sea products and cleaning chemicals.
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Defence and Aerospace Chennai has growing defence and aerospace supply chain and it requires fasteners with close tolerances, traceable material origins, and appropriate approvals. We can supply SS 304 and 316 fasteners with dimensional inspection reports and EN 10204 3.1 MTCs suited to defence procurement requirements.
Why Mumbai Buyers Choose Stainless Bolt Industries:
- EN 10204 3.1 MTCs and dimensional inspection reports as standard
- ASTM A193/A194 certified material for CPCL and refinery applications
- SS 316L available on request for marine weld-zone use
- Stock depth on auto sector sizes M8, M10, M12 in SS 304
- Pan-India dispatch with Tamil Nadu GST compliance and commercial invoicing
Technical Specifications
| Product | Grade 304 Standard | Grade 316 Standard |
|---|---|---|
| Hex Bolts | ASTM A193 B8 | ASTM A193 B8M |
| Hex Nuts | ASTM A194 Grade 8 | ASTM A194 Grade 8M |
| Screws | AISI 304 / DIN | AISI 316 / DIN |
Frequently Asked Questions
SS 316 specifically ASTM A193 B8M bolts and A194 8M nuts for high-temperature and high-pressure flange connections. The coastal proximity of the Manali zone makes 316’s chloride resistance essential for external fittings.
Yes. SS 304 hex bolts, machine screws, and socket cap screws are standard for auto sector fixture and tooling assembly. We supply with dimensional inspection reports when tight tolerances are specified.
Yes. We do offer SS 316 machine screws, hex bolts, and self-tapping variants are stocked and available with EN 10204 3.1 certificates. Seafood export units operating under HACCP standards can use our documentation for compliance records.