Heavy Hex Nuts
Product Description
Heavy Hex Nuts are specially designed with a larger and thicker hexagonal shape compared to standard hex nuts. These nuts are engineered to offer superior strength and stress distribution in demanding environments and critical applications. Manufactured as per international standards such as ASTM A194, A563, and ASME B18.2.2, our heavy hex nuts at SM Fasteners are available in multiple grades including 2H, 7, 8, DH, and 8M, and come in materials such as carbon steel, alloy steel, and stainless steel (304/316).
These nuts are ideal for high-pressure and high-temperature applications, including flanged joints and structural connections. Whether used in petrochemical, power generation, or heavy construction, our precision-machined heavy hex nuts deliver unmatched performance.
Applications
Heavy hex nuts are widely used in industrial applications that demand high clamping force and enhanced mechanical strength. Their larger size makes them suitable for structural and high-load assemblies.
Common Applications Include:
Pressure vessels and heat exchangers
Flange joints in refineries and pipelines
Wind turbines and heavy structural steelwork
Railway track fixtures
Power plants and oil rigs
Bridges and seismic zone constructions
Technical Specifications
| Parameter | Details |
|---|---|
| Product Type | Heavy Hex Nuts |
| Thread Type | Full / Partial Threaded |
| Standards | ASTM A194, ASTM A563, ASME B18.2.2 |
| Grades | 2H, 7, 8, DH, 8M |
| Material | Alloy Steel, Carbon Steel, Stainless Steel |
| Finish | Plain, Black Oxide, Hot Dip Galvanized, PTFE Coated |
| Size Range | 3/8” to 4” (UNC/UNF/Metric) |
Why Our Heavy Hex Nuts?
At SM Fasteners, we stand out by offering heavy-duty fastening solutions that are reliable, certified, and built for extreme conditions.
✅ Manufactured from Premium Steel Grades – including ASTM 2H, DH, 8M
✅ Heat Treatment & Testing – Ensuring mechanical strength and uniformity
✅ Dimensional Accuracy – Precision threading and chamfering
✅ Surface Finishing Options – For corrosion resistance and environmental suitability
✅ Bulk Inventory + Custom Sizes – Immediate dispatch of standard sizes or custom runs
✅ In-house QA/QC Testing – Material traceability with MTC included
Packaging and Delivery
To ensure the integrity of each heavy hex nut during transport and storage, we provide industrial-grade packaging, customized per order volume:
Individual polybag wrapping for corrosion-sensitive products
Double-layered HDPE sacks or jute bags
Wooden boxes with cushioning for export orders
“Made in India” and SM Fasteners branding on all packages
Industries We Serve
Our Heavy Hex Nuts are trusted across diverse industries due to their unmatched strength and compliance with global standards:
Oil & Gas Refining
Power Generation (Thermal, Hydro, Wind)
Heavy Machinery & Equipment Manufacturing
Construction & Infrastructure Projects
Railways & Shipbuilding
Petrochemical and Fertilizer Plants
Energy & Utilities Sectors
Documents Supplied
Every dispatch includes a complete documentation set, ensuring traceability, quality, and compliance.
✔️ Mill Test Certificate (MTC)
✔️ Third-Party Inspection Reports (if requested)
✔️ Raw Material Certificate
✔️ Dimensional Inspection Report
✔️ Heat Number Stamping (optional)
✔️ Custom Certifications (EN 10204 3.1/3.2)
Request a Quotation
Have bulk orders or project requirements? We offer quick quotes, material consultation, and dedicated sales support.
📧 Email: susheel@smfastners.com
📞 Call: +91 8968469570
💬 WhatsApp Chat: Click to Chat
🛒 Fasteners that hold your world together – Get your quote today!