We, Stainless Bolt Industries, are a leading manufacturer and supplier of stainless steel hex bolts, nuts, and SS screws in Pune. The city has a profound manufacturing identity, and that is built on precision. The city has great automotive and auto-ancillary sector that produces components which supply OEMs globally, and that supply chain requires fasteners with dimensional accuracy and traceable material origins. Beyond auto, Pune’s engineering and manufacturing ecosystem includes defence equipment, heavy machinery, pumps and valves, IT hardware, and a growing pharmaceutical cluster in Hinjewadi and Chakan. We supply SS hex bolts, nuts, and screws in SS 304 and SS 316 to buyers across Pune, Chakan, Pimpri-Chinchwad, Hinjewadi, and Ranjangaon.
Pune’s industrial base is demanding in a specific way, procurement teams here often have engineering backgrounds and know exactly what they need. They’re not asking for ‘SS bolts‘; they’re asking for ASTM A193 B8 in M16 x 2.0 pitch, hex head, partially threaded, with 3.1 MTC. We work with that level of specification.
SS Hex Bolts in Pune
Auto sector jig and fixture assembly, pump and valve manufacture in Pimpri-Chinchwad, pharmaceutical process equipment in Hinjewadi, and structural bolting in Pune’s commercial construction and it requires hex bolts in SS 304 and SS 316 serve a wide cross-section here. Pump and valve manufacturers often specify SS 316 for body bolting on corrosive fluid handling equipment.
Available Types:
- Fully threaded hex bolts
- Partially threaded hex bolts (hex cap screws)
- Heavy hex bolts for structural applications
Sizes and Standards:
Sizes: M6 to M100 (metric) | 1/4″ to 4″ (inch)
Standards: ASTM A193, DIN 933, DIN 931, ISO 4014, ISO 4017
SS Hex Nuts in Pune
Pump and valve assemblies in Pimpri-Chinchwad require matched-grade nuts — SS 316 nuts with SS 316 bolts for corrosive fluid service, SS 304 for general industrial use. Heavy hex nuts to ASTM A194 are used for high-pressure applications in pharma and process industry. Nylon insert lock nuts are common on automotive machinery assemblies.
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 Pune
Automotive fixture and tooling assembly across Chakan uses SS 304 socket cap screws and machine screws in large quantities. HVAC on Pune’s commercial towers and IT parks in Hinjewadi uses SS 304 self-tapping screws. Food and beverage processing units in Ranjangaon specify SS 316 across all contact-zone fasteners.
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 |
| Chemical Resistance | Moderate | High — suited to pump/valve and pharma service |
| Cost | Lower | Approx. 20–30% higher than 304 |
| Best for Bangalore | Auto fixtures, HVAC, structural, data centres | Pumps, valves, pharma, food processing |
Applications across Pune's Sectors
Automotive: OEM and tier-1 auto component manufacturers use SS 304 hex bolts, socket cap screws, and machine screws for jig, fixture, and tooling assembly. Dimensional accuracy and consistent hardness are requirements that come with the territory in auto manufacturing supply chains.
Pumps and Valves: Pune is known for its substantial pump and valve industry. Equipment handling water treatment chemicals, acids, and industrial fluids specifies SS 316 for body bolts, bonnet bolts, and connecting hardware. Matched-grade 316 hex nuts are required for certified flange connections.
Pharmaceutical: Pune has great Pharma manufacturing facilities in and around Hinjewadi, including FDA-approved and WHO-GMP certified plants. SS 316 with EN 10204 3.1 MTCs and lot traceability is the specification. Clean room panel fasteners, bioreactor connections, and CIP line fittings all fall in this category.
Food and Beverage: Ranjangaon MIDC hosts food processing, beverage, and FMCG production units including export-oriented facilities. SS 316 machine screws and hex bolts are specified for processing line equipment. HACCP and export certification audits require documented material sourcing.
Engineering and Heavy Machinery: Pune has renowned engineering cluster compressors, industrial pumps, heavy machinery for mining and infrastructure uses SS 304 and 316 hex bolts across a wide size range. M20, M24, and M30 in heavy hex configuration are common for large machine assembly.
Why Pune Buyers Choose Stainless Bolt Industries
- EN 10204 3.1 MTCs as standard required for auto and pharma supply chains
- ASTM A193/A194 certified material for pump, valve, and pharma applications
- Dimensional inspection reports available for auto sector tooling
- Custom thread forms (UNC, UNF, metric fine pitch) on request
- Bulk supply to Chakan and Ranjangaon with GST-compliant 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 hex bolts and matching hex nuts for corrosive fluid service. ASTM A193 B8M bolts with A194 8M nuts are specified for high-pressure flanged connections. For standard water service pumps, SS 304 is sufficient.
Yes. SS 304 socket cap screws in metric coarse and fine pitch are stocked. Dimensional inspection reports are available for tooling and fixture supply chains that require geometric tolerance documentation.
Yes. SS 316 hex bolts, machine screws, and nuts with ASTM A193 B8M / A194 8M certification and EN 10204 3.1 MTCs. Lot traceability reports for FDA audit documentation are available on request.