Hex Nuts
Standard six-sided threaded fasteners produced to DIN 934 and ASME B18.2.2 for general structural and piping applications.
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Stud Bolt India is an ISO 9001:2015 certified manufacturer, stockist, and global exporter of high-precision industrial nuts. Operating from Mumbai, India, we produce comprehensive bolting solutions including Heavy Hex Nuts (ASTM A194 2H/8/8M), Prevailing Torque Lock Nuts, Flange Nuts, Dome Nuts, Weld Nuts, and Custom Machined Nuts. Designed for demanding applications across oil refineries, offshore platforms, chemical process plants, power generation, and heavy civil engineering, our nuts guarantee exact thread fitment, high proof-load strength, and full heat-number traceability backed by EN 10204 3.1 certification.
Manufacturing Precision
Heavy Hex Nuts & Specialty Bolting Solutions
Our manufacturing facility utilizes advanced hot-forging, cold-heading, and high-speed CNC tapping equipment to ensure flawless mechanical integrity across both metric and imperial sizes.
Engineered to withstand high pressure, cyclic vibration, thermal expansion, and corrosive media, our nuts meet strict international standards including ASME B18.2.2, DIN 934, ISO 4032, and ASTM specifications. Whether your project requires high-tensile carbon steel nuts for structural steelwork or exotic alloy nuts (Inconel, Monel, Duplex) for subsea operations, Stud Bolt India delivers uncompromised quality with sea-worthy export packaging.
- 100% Heat Number Traceability
- EN 10204 3.1 Mill Test Reports
- NACE MR0175 / ISO 15156 Compliance
- PTFE / Xylan & HDG Coated Options
100% TestedProof Load Verified
Comprehensive Fastener Lineup
Types of Industrial Nuts We Manufacture
Engineered for critical industrial assemblies, our product range covers standard standard-pitch hex nuts through to specialized vibration-proof locking nuts.
Heavy Hex Nuts
Thicker and wider than standard hex nuts, engineered specifically for high-pressure, high-temperature flange bolting (ASTM A194 2H/8/8M).
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Lock Nuts
Vibration-resistant nuts featuring nylon inserts or all-metal prevailing torque deformation to prevent self-loosening under shock loads.
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Flange Nuts
Integrated wide circular flange acts as a built-in washer to distribute clamping force evenly over the surface being secured.
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K-Lock Nuts (KEPS)
Pre-assembled hex nuts with attached free-spinning external tooth lock washers for fast assembly and positive grip.
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Dome / Cap Nuts
Domed top covers exposed bolt threads to prevent mechanical snagging, moisture ingress, and offer an aesthetically smooth finish.
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Weld Nuts
Designed with specialized welding pilot pins and corner tabs to be permanently welded onto sheet metal and structural fabrications.
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Wing Nuts
Features side wings enabling rapid manual tightening and loosening without requiring specialized wrench tools.
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Engineering Specifications
Technical Specification & Manufacturing Data
Comprehensive reference data detailing size dimensions, material grades, standards, and surface finishes available for global procurement.
| Specification Parameter | Technical Details & Available Options |
|---|---|
| Nominal Size Range | Metric: M3 to M100 | Imperial: 1/4" to 4" (Custom non-standard dimensions produced to client drawings) |
| Dimensional Standards | ASME B18.2.2, ASME B18.2.4.1M, ASME B18.2.4.2M, DIN 934, DIN 6923, ISO 4032, ISO 4033, UNI, BS 1768, BS 3692 |
| ASTM Heavy Hex Grades | ASTM A194 Grade 2H, 2HM, Grade 4, Grade 7, Grade 7M, Grade 8, 8M, 8T, 8C, Grade 16 | ASTM A563 DH / DH3 |
| Stainless Steel Grades | AISI 304, 304L, 316, 316L, 316Ti, 317L, 321, 347, 904L (Property Class 50, 70, 80 Strain Hardened) |
| Duplex & Super Duplex | Duplex 2205 (UNS S31803 / S32205), Super Duplex 2507 (UNS S32750), UNS S32760 (Zeron 100) |
| High Nickel Alloys | Inconel 600, 625, 718 | Monel 400, K-500 | Hastelloy C276, C22, B2 | Titanium Grade 2, Grade 5 |
| Carbon & Alloy Steel | Property Class 6, Class 8, Class 10, Class 12 | Mild Steel (EN8, EN9, EN19, 4140, 4340) |
| Thread Form Pitch | UNC, UNF, UNEF, Metric Coarse, Metric Fine, 8-UN Series (ASME B1.1 / B1.13M Class 2B/6H fit) |
| Protective Surface Finishes | PTFE / Xylan Fluoropolymer Coating, Hot-Dip Galvanizing (HDG), Electro-Zinc Plating (Yellow, Black, Blue), Cadmium Plating, Dacromet, Passivated, Zinc-Nickel Coating |
| Testing & Quality Documentation | EN 10204 3.1 Material Test Certificate, PMI Chemical Analysis, Proof Load Testing, Hardness Testing, Microstructure Inspection, Third-Party Inspection (TUV, DNV, BV, SGS) |
Global Dispatch Standards
Export Packaging & Logistics Integrity
We understand that overseas buyers require flawless rust-free cargo delivery. Stud Bolt India enforces strict export packaging standards for all international consignments.
Heavy-Duty Cardboard Boxes
Nuts are bagged in thick poly-bags and packed into high-burst-test cardboard boxes.
ISPM 15 Wooden Crates
Fumigated wooden boxes and palletized crates designed for sea container freight.
VCI Corrosion Protection
Volatile Corrosion Inhibitor (VCI) lining protects carbon and alloy steel nuts from maritime moisture.
Barcode & Heat Marking
Clear outer box labeling detailing grade, size, batch number, and heat code for easy warehouse logging.
Material Versatility
Specialty Alloy Nuts by Material Composition
Whether your process environment involves cryogenic liquids, hot concentrated acids, or marine splash zones, we formulate and forge nuts engineered to resist degradation.
Need Custom Fasteners or Bulk Pricing?
Get in touch with our technical sales engineers in Mumbai. We provide rapid quotation responses within 24 hours, inclusive of complete specification reviews and delivery schedules.
Worldwide Footprint
Exporting Industrial Fasteners Globally
Stud Bolt India supplies EPC contractors, stockists, and industrial end-users across 24+ countries with full export documentation and logistics management.
Frequently Asked Questions
Questions About Industrial Nuts
What standard grades of heavy hex nuts do you manufacture?
We manufacture heavy hex nuts strictly conforming to ASTM A194 Grades 2H, 2HM, 4, 7, 7M, 8, 8M, 8T, 8C, and A563 Grade DH, as well as high-alloy grades in Duplex 2205, Super Duplex S32750, Inconel, Monel, and Titanium.
What quality certifications accompany export shipments of industrial nuts?
Every export shipment is dispatched with complete EN 10204 3.1 Material Test Reports (MTRs), detailing chemical analysis, mechanical proof load testing, hardness measurements, dimensional inspection, and heat number traceability.
Do you provide protective coatings for nuts used in offshore environments?
Yes. We offer specialized surface coatings including PTFE / Xylan (Fluoropolymer), Hot-Dip Galvanizing (HDG), Electro-Zinc Plating, Cadmium Plating, and Zinc-Nickel coatings for high-corrosion, subsea, and chemical environments.
Can you manufacture custom nuts according to engineered drawings?
Yes, our CNC precision machining facility produces non-standard nuts, oversize tapping, custom height heavy hex nuts, 12-point flange nuts, and special pitch threads based on detailed client drawings and specifications.