Mumbai’s relationship with corrosion is complicated. The city sits on a peninsula surrounded by saltwater, the humidity stays high for most of the year, and a significant portion of its heavy industry refineries, petrochemical plants, and power stations operates in environments where the wrong grade of stainless steel fastener will fail before the project is even commissioned.
We Stainless Bolt Industries are prominent manufacturer, supplier and exporter of SS hex bolts, nuts, and screws in SS 304 and SS 316 to buyers across Mumbai and the wider MMR, with material that’s tested, documented, and correctly graded for actual site conditions.
Mumbai also has one of India’s most active trading communities for industrial material. That means price competition is intense, and it also means the market is full of material that looks right but isn’t. EN 10204 3.1 certification separates documented product from undocumented product. We ship with it as standard.
SS Hex Bolts in Mumbai
Marine and coastal construction, petrochemical plant assembly, power station works, and high-rise structural bolting all drive hex bolt demand in Mumbai.
For ONGC and offshore applications, ASTM A193 B8M in SS 316 is the standard specification. For general construction on inland projects, SS 304 in DIN 933 or ISO 4017 covers most needs. We stock M6 to M100 in both grades.
Available Types:
- Fully threaded hex bolts
- Partially threaded hex bolts (hex cap screws)
- Heavy hex bolts for structural use
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 Mumbai
A properly matched nut is non-negotiable on flanged pipe connections and structural joints. We supply 304 and 316 hex nuts across all sizes, with heavy hex nuts to ASTM A194 available for pressure line applications.
JNPT and port facility projects regularly specify ASTM A194 8M heavy hex nuts for marine structural connections.
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 Machine Screws Dealer in Mumbai
Commercial building fit-outs in BKC and Nariman Point use SS 304 self-tapping screws and machine screws in large quantities for HVAC, electrical, and facades.
Pharmaceutical plants in Thane and Navi Mumbai specify SS 316 machine screws for process equipment. Marine-grade SS 316 self-tapping screws are used heavily in jetty fittings, boat superstructures, and waterfront development along Mumbai’s coastline.
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)
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 |
| Marine/Coastal Use | Not suitable near saltwater | Standard for coastal and marine applications |
| Chemical Resistance | Moderate | Prominent is handling chlorides well |
| Cost | Lower | Approx. 20–30% higher than 304 |
| Best for Mumbai | Inland construction, HVAC, general fabrication | Coastal construction, offshore, pharma, ports |
Key Application Sectors in Mumbai:
Oil, Gas, and Petrochemicals Refinery and petrochemical plant maintenance in Mahul and Chembur requires ASTM A193 B8M studs and bolts with A194 8M nuts for flanged connections. Certified material with full traceability is the minimum standard on ONGC and PSU projects. We supply compliant material with EN 10204 3.1 documentation.
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Pharmaceutical Manufacturing Thane’s pharma belt and Navi Mumbai’s MIDC clusters have facilities manufacturing APIs and formulations for global markets. FDA and WHO-GMP compliance requires SS 316 fasteners on process equipment and clean room assemblies. Lot traceability is essential.
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Port and Marine Infrastructure JNPT, Mumbai Port Trust, and Nhava Sheva expansion works require SS 316 hex bolts and structural fasteners for berth structures, port cranes, and marine infrastructure. Grade 316L is also available on request for submerged or weld-zone applications.
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High-Rise and Commercial Construction Mumbai’s vertical construction market is enormous. Facade cladding, curtain wall systems, HVAC ducting, and internal structural bolting all needs documented fastener supply. Grade 304 mostly covers interior and inland applications; Grade 316 is specified for coastal-facing facades.
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Food and Beverage Processing Mumbai has a very profound food processing industry from large FMCG manufacturers in Thane to commercial food production units in Vashi specifies SS 316 for any fastener in or near food contact. Machine screws, hex bolts, and self-tapping variants in 316 are stocked.
Why Mumbai Buyers Choose Stainless Bolt Industries:
- EN 10204 3.1 MTCs as standard not an optional extra
- SS 316L available on request for marine weld-zone applications
- Stock depth on high-demand sizes for urgent ONGC and pharma orders
- Bulk supply for JNPT-bound shipments with export documentation
- Competitive pricing with direct supply chain no unnecessary intermediary margin
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 or SS 316L for weld-zone components. ASTM A193 B8M bolts with A194 8M heavy hex nuts, certified to EN 10204 3.1, are the standard on offshore platforms and coastal petrochemical infrastructure.
Yes. SS 316 across all types hex bolts, hex nuts, machine screws, socket cap screws with ASTM A193 B8M / A194 8M certification and EN 10204 3.1 MTCs. Lot traceability reports are available for FDA audit documentation.
Yes. We dispatch to MIDC addresses in Thane, Navi Mumbai, and Ambernath regularly. Orders come with GST-compliant invoicing, packing lists, and MTCs. Lead times on stock sizes are typically 3–5 working days from order confirmation.