Vimal Industrial Corporation is a leading stockist and supplier of BS 1083 precision hexagon nuts based in Mumbai, India. Engineered to comply with the British Standard BS 1083, these imperial‑threaded nuts guarantee accurate dimensions, repeatable preload, and reliable performance for structural, mechanical, and maintenance applications. With a broad inventory covering multiple thread series (B.S.W. and B.S.F.), property classes, and protective finishes, we support OEMs, EPC contractors, repair shops, and MRO teams that demand uncompromising joint integrity.
BS 1083 specifies precision hexagon bolts, screws, and nuts with British Standard Whitworth (BSW) and British Standard Fine (BSF) threads in nominal sizes from ¼ inch up to 2 inches inclusive, covering both coarse and fine pitches. The standard mandates strict tolerances on across‑flats dimensions, bearing surfaces, and thread engagement, ensuring full interchangeability and consistent wrenching clearance across allied fastener assemblies. Typical manufacturing materials range from low or medium carbon steel (for general structural use) to alloy or stainless grades for higher tensile or corrosion‑resistant requirements. Surface finishes such as plain/oiled, zinc‑plated, hot‑dip galvanised, or black oxide are applied to suit differing environmental and torque‑tension conditions.
As India’s power, oil‑and‑gas, and heavy‑engineering sectors continue to maintain equipment built to imperial specifications, the demand for BS 1083‑compliant hex nuts remains strong. Vimal Industrial Corporation meets this need by partnering with leading manufacturers—most notably APL Fasteners—to maintain an extensive, ready‑to‑ship inventory covering both BSW and BSF thread series. From single‑carton refills to palletised project packs, every lot is stored in climate‑controlled conditions and verified against BS 1083 dimensional tolerances.
Leveraging our strategically located Mumbai warehouse and a robust pan‑India logistics network, we can dispatch orders the same day—whether for an emergency shutdown or a phased EPC delivery schedule. Customers receive full mill test certificates, lot‑traceability data, and third‑party inspection reports on request, ensuring each nut arrives with the documentation required for stringent QA/QC protocols.
BS 1083 hex nuts are designed for precise alignment, dependable preload, and long‑term durability in assemblies that still follow imperial (Whitworth/Fine) thread standards. Their accurate across‑flats dimensions and robust thread forms make them the go‑to choice whenever legacy equipment or British‑spec drawings call for high‑integrity fastening.
Common Applications Include:
Oil & Gas / Petrochemical Facilities
Used on refinery pipe flanges, pressure‑vessel manways, and heat‑exchanger bundles originally built to BSW/BSF specifications.
Power Generation & Utilities
Secure turbine casings, condenser clamps, and boiler mountings where imperial fasteners remain part of the plant’s maintenance inventory.
Heavy Machinery Overhauls
Ideal for rebuilding British‑origin presses, gearboxes, mining rigs, and other legacy equipment that demands exact replacement hardware.
Rail & Transport Maintenance
Fasten carriage under‑frames, bogie assemblies, and coupler housings on rail stock designed around imperial threads.
Steel Structure Retrofits
Anchor bridge splices, pipe bridges, and platform extensions where existing holes match Whitworth hex‑nut dimensions.
General Engineering & MRO
Reliable choice for pumps, compressors, HVAC skids, and workshop fixtures requiring vibration‑resistant, imperial‑threaded joints.
As a trusted name in the industrial fasteners sector, Vimal Industrial Corporation is known for its reliable sourcing, prompt delivery, and deep technical understanding. We specialize in supplying BS 1083 Hex Nuts that meet global performance standards, catering to a wide range of industries including infrastructure, automotive, power, and heavy engineering.
Why clients across India choose us:
✅ Authorized APL Fasteners Dealer – Guaranteed genuine product with full mill documentation
✅ Comprehensive Stock – Multiple thread series (BSW, BSF), strength levels, and finishes on the shelf
✅ Custom Packing & Bulk Fulfilment – Bar‑coded bags, kit sets for turnarounds, or palletised exports—whatever the job demands
✅ Technical Guidance – Assistance with thread identification, torque charts, and metric‑to‑imperial conversions
✅ Pan‑India Reach – Strategic Mumbai warehouse enables quick delivery to metro hubs, industrial corridors, and remote project sites
✅ Stringent Quality Assurance – Nuts inspected to BS 1083 dimensional limits and supplied with relevant ISO mechanical certificates
✅ Customer‑First Service – Rapid quotations, dedicated account managers, and seamless export paperwork for overseas buyers
Whether you’re an OEM, contractor, or industrial buyer, we simplify your fastener procurement with timely service, accurate documentation, and unbeatable reliability.
| Nominal Size | TPI / Thread Series | Unit | Width Across Flats F | Width Across Corners G (max.) |
Thickness Hex Nut H | Minor Ø (Bore) d | |||
|---|---|---|---|---|---|---|---|---|---|
| Min. | Max. | Min. | Max. | Min. | Max. | ||||
| 1/4″ | 0.25 – 20 UNC | inch | 0.438 | 0.445 | 0.510 | 0.190 | 0.200 | 0.196 | 0.207 |
| mm | 0.110 | 0.111 | 0.128 | 0.048 | 0.050 | 0.049 | 0.052 | ||
| 5/16″ | 0.3125 – 18 UNC | inch | 0.518 | 0.525 | 0.610 | 0.240 | 0.250 | 0.252 | 0.265 |
| mm | 0.130 | 0.131 | 0.153 | 0.060 | 0.063 | 0.063 | 0.066 | ||
| 3/8″ | 0.375 – 16 UNC | inch | 0.592 | 0.600 | 0.690 | 0.302 | 0.312 | 0.307 | 0.321 |
| mm | 0.148 | 0.150 | 0.173 | 0.076 | 0.078 | 0.077 | 0.080 | ||
| 7/16″ | 0.4375 – 14 UNC | inch | 0.702 | 0.710 | 0.820 | 0.365 | 0.375 | 0.360 | 0.376 |
| mm | 0.176 | 0.178 | 0.205 | 0.091 | 0.094 | 0.090 | 0.094 | ||
| 1/2″ | 0.5 – 13 UNC | inch | 0.812 | 0.820 | 0.950 | 0.427 | 0.437 | 0.417 | 0.434 |
| mm | 0.203 | 0.205 | 0.238 | 0.107 | 0.109 | 0.104 | 0.109 | ||
| 9/16″ | 0.5625 – 12 UNC | inch | 0.912 | 0.920 | 1.060 | 0.490 | 0.500 | 0.472 | 0.490 |
| mm | 0.228 | 0.230 | 0.265 | 0.123 | 0.125 | 0.118 | 0.123 | ||
| 5/8″ | 0.625 – 11 UNC | inch | 1.000 | 1.010 | 1.170 | 0.552 | 0.562 | 0.527 | 0.546 |
| mm | 0.250 | 0.253 | 0.293 | 0.138 | 0.141 | 0.132 | 0.137 | ||
| 3/4″ | 0.75 – 10 UNC | inch | 1.900 | 1.190 | 1.390 | 0.677 | 0.687 | 0.642 | 0.663 |
| mm | 0.475 | 0.298 | 0.348 | 0.169 | 0.172 | 0.161 | 0.166 | ||
| 7/8″ | 0.875 – 9 UNC | inch | 1.288 | 1.288 | 1.500 | 0.740 | 0.750 | 0.755 | 0.778 |
| mm | 0.322 | 0.322 | 0.375 | 0.185 | 0.188 | 0.189 | 0.195 | ||
| 1″ | 1 – 8 UNC | inch | 1.468 | 1.468 | 1.710 | 0.865 | 0.875 | 0.865 | 0.890 |
| mm | 0.367 | 0.367 | 0.428 | 0.216 | 0.219 | 0.216 | 0.223 | ||
| 1 1/8″ | 1.125 – 8 UN | inch | 1.640 | 1.640 | 1.930 | 0.990 | 1.000 | 0.990 | 1.015 |
| mm | 0.410 | 0.410 | 0.483 | 0.248 | 0.250 | 0.248 | 0.254 | ||
| 1 1/4″ | 1.25 – 8 UN | inch | 1.815 | 1.815 | 2.150 | 1.105 | 1.125 | 1.115 | 1.140 |
| mm | 0.454 | 0.454 | 0.538 | 0.276 | 0.281 | 0.279 | 0.285 | ||
| 1 3/8″ | 1.375 – 8 UN | inch | 2.005 | 2.005 | 2.370 | 1.230 | 1.250 | 1.240 | 1.265 |
| mm | 0.501 | 0.501 | 0.593 | 0.308 | 0.313 | 0.310 | 0.316 | ||
| 1 1/2″ | 1.5 – 8 UN | inch | 2.175 | 2.175 | 2.560 | 1.335 | 1.375 | 1.365 | 1.390 |
| mm | 0.544 | 0.544 | 0.640 | 0.334 | 0.344 | 0.341 | 0.348 | ||
| 1 3/4″ | 1.75 – 8 UN | inch | 2.520 | 2.520 | 2.980 | 1.605 | 1.625 | 1.615 | 1.640 |
| mm | 0.630 | 0.630 | 0.745 | 0.401 | 0.406 | 0.404 | 0.410 | ||
| 2″ | 2 – 8 UN | inch | 2.700 | 2.700 | 3.190 | 1.730 | 1.750 | 1.865 | 1.890 |
| mm | 0.675 | 0.675 | 0.798 | 0.433 | 0.438 | 0.466 | 0.473 | ||
It uses the British Standard Whitworth (BSW) thread system with a 55-degree angle. This makes it essential for maintaining older machinery or British-design equipment that doesn’t fit standard metric bolts.
Unlike “Black” or rough nuts, BS 1083 nuts are machined to tighter tolerances for a smoother finish. This ensures a high-quality bolt fastener connection in precision engineering and high-vibration environments.
If your machinery is of British origin or is a legacy model, it likely requires British Standard Bolts. The best way to check is by measuring the Threads Per Inch (TPI). If the TPI doesn’t match metric standards, you need a specialized Nut Bolt Supplier to provide the correct BS 1083 fit
Yes, definitely. While steel is common, Stainless Steel Fasteners are the best choice for preventing rust. If your project is in a humid city like Mumbai, using SS grade BS 1083 nuts ensures your bolt fastener won’t seize up due to corrosion.
Always ask for a Mill Test Report (MTR). A transparent Nut Bolt Supplier like Vimal Industrial will provide documentation proving that your BS 1083 Hex Nut meets the chemical and physical strength requirements for your industrial project.
