Vimal Industrial Corporation is a trusted stockist and supplier of BS 1083 Hexagon Nuts based in Mumbai, India. Our range is manufactured to meet the requirements of British Standard BS 1083, ensuring dimensional accuracy, proper fitment, and dependable fastening performance. These imperial-threaded hex nuts are widely used in structural, mechanical, and maintenance applications where consistency and joint reliability are critical. With ready stock across different thread types such as BSW and BSF, along with multiple grades and finishes, we cater to OEMs, contractors, and industrial buyers looking for dependable fastening solutions.
The BS 1083 standard covers precision hexagon fasteners with British Standard Whitworth (BSW) and British Standard Fine (BSF) threads, typically ranging from ¼ inch to 2 inches. These nuts are produced with controlled tolerances on across-flat dimensions, thread engagement, and bearing surfaces, which helps maintain proper load distribution and easy assembly with matching bolts. This level of standardization ensures interchangeability and smooth installation across different industrial setups without fitment issues.
Depending on the application, these hexagon nuts are manufactured using suitable materials such as carbon steel for general use, and alloy or stainless steel for higher strength and corrosion resistance. To enhance durability and performance in different environments, various surface finishes are available, including zinc plating, hot-dip galvanizing, black oxide, and plain finish. This allows the nuts to perform reliably in indoor, outdoor, and high-moisture conditions while maintaining fastening integrity over time.
Industries like power, oil & gas, and heavy engineering in India still rely on equipment built around imperial standards, which keeps the demand for BS 1083 Hexagon Nuts consistently relevant. At Vimal Industrial Corporation, we don’t just supply these fasteners, we make sure they are readily available when actually needed. By working with trusted manufacturers such as APL Fasteners, we maintain a dependable stock of both BSW and BSF thread series, suitable for maintenance work as well as ongoing project requirements.
Leveraging our Mumbai-based warehouse and a well-connected pan-India logistics network, we ensure quick and dependable dispatch of orders. Whether it’s an urgent shutdown requirement or a planned EPC delivery schedule, our system is designed to respond without delays. We focus on keeping the supply process smooth and predictable so that your operations are not impacted by material shortages.
Along with timely delivery, we provide complete supporting documentation wherever required. This includes mill test certificates, lot traceability details, and third-party inspection reports, ensuring every batch meets quality and compliance expectations. It allows our customers to proceed with confidence, especially in projects where strict QA/QC standards are followed.
BS 1083 Hexagon Nuts are widely used in applications where imperial (Whitworth/Fine) thread standards are still followed. Known for their precise dimensions, proper thread engagement, and consistent performance, these nuts are a dependable choice for maintaining joint strength and long-term reliability. As part of a trusted range of stainless steel fasteners, they are especially useful in environments where durability and corrosion resistance are important.
Common Applications Include:
Oil & Gas / Petrochemical Facilities
Used in refinery pipelines, pressure vessel connections, and heat exchanger assemblies that operate on BSW/BSF standards. Their reliable fitment makes them suitable for critical fastening points in demanding environments.
Power Generation & Utilities
Applied in turbines, condensers, and boiler structures where imperial fasteners are still part of regular maintenance. Many bolts and nuts suppliers continue to support this demand due to ongoing use in older plant systems.
Heavy Machinery Overhauls
Preferred for rebuilding British-origin machinery such as gearboxes, presses, and mining equipment. A dependable nut bolt supplier ensures availability of the correct specifications for accurate replacement and assembly.
Rail & Transport Maintenance
Used in carriage frames, bogie assemblies, and coupling systems where imperial thread compatibility is required for proper alignment and safety.
Steel Structure Retrofits
Suitable for structural upgrades where existing bolt holes match Whitworth standards, allowing easy installation without rework.
General Engineering & MRO
Commonly used in pumps, compressors, and workshop equipment. These fasteners offer a practical solution for maintenance teams working with imperial-threaded assemblies across industries.
Vimal Industrial Corporation has built a strong reputation in the industrial fasteners space through consistent supply, practical understanding of applications, and dependable service. We specialize in supplying BS 1083 Hex Nuts that meet required performance standards and suit industries like infrastructure, automotive, power, and heavy engineering. As a reliable nut bolt supplier, our focus is always on delivering the right product, on time, without complications.
Why clients across India choose us:
✅ Authorized APL Fasteners Dealer – Assured supply of genuine products with proper mill test certificates and supporting documentation
✅ Comprehensive Stock – Availability of BSW and BSF thread series, multiple grades, and finishes, including options within our stainless steel fasteners range
✅ Custom Packing & Bulk Fulfilment – From standard packing to customized kits and bulk dispatches, we handle requirements based on project needs
✅ Technical Guidance – Practical assistance with thread selection, application suitability, and compatibility to avoid on-site issues
✅ Pan‑India Reach – As experienced bolts and nuts suppliers, our Mumbai base helps us manage quick and reliable delivery across India
✅ Stringent Quality Assurance – Every batch is checked for dimensional accuracy and supplied with necessary quality documents to meet project standards
✅ Customer‑First Service – Fast quotations, clear communication, and smooth order handling to keep procurement simple and efficient
Whether you’re managing a project, handling maintenance, or sourcing for ongoing operations, we aim to make fastener procurement straightforward with consistent quality, proper documentation, and dependable support.
| 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.
