Coupling Nuts – Precision Thread Extension & Secure Joining
Product Description
Coupling Nuts, also known as extension nuts or connector nuts, are long hex nuts used to connect two male-threaded rods, bolts, or studs. Their extended body allows for deep thread engagement, making them essential in length adjustments, structural joints, and threaded rod coupling.
At SM Fasteners, we offer high-strength coupling nuts in a wide range of materials and finishes—ensuring optimal fit, torque resistance, and corrosion protection across structural and industrial applications.
Applications
Coupling Nuts are essential in high-precision, adjustable, or extended fastening needs:
Joining Threaded Rods in Construction Scaffolding
HVAC Ductwork Suspension
Electrical Tray & Conduit Systems
Automotive & Machine Assembly Adjustments
Hydraulic and Mechanical Linkages
Industrial Maintenance and Repair Jobs
Technical Specifications
| Parameter | Details |
|---|---|
| Type | Hexagonal Coupling Nut (Extension Nut) |
| Standard | DIN 6334, ASTM A563, ISO Metric |
| Material | Mild Steel, SS 304 / SS 316, Alloy Steel, Brass |
| Grades | 4.6, 8.8, 10.9, A2-70, A4-80 |
| Size Range | M6 to M48 | 1/4″ to 2″ |
| Finish | Zinc Plated, Hot Dip Galvanized, Black Oxide, Self-Color |
| Thread Types | Metric / UNC / UNF / BSW |
| Length | 2x or 3x standard hex nut height |
Why Choose Our Coupling Nuts?
✅ DIN 6334 standard compliance for reliability
✅ Smooth internal threading for optimal fit & torque control
✅ Multiple materials including corrosion-resistant SS 304/316
✅ Available in zinc, black oxide, HDG & custom finishes
✅ Perfect for structural joints and load-bearing connections
✅ Fast availability in both metric and imperial threads
Packaging and Delivery
Your order is securely packed and labeled to ensure safe handling and traceability:
Packed in zip-lock polybags or bubble wrap
Boxed with quantity stickers and size tags
Bulk boxes with barcode & MTC info
Industries We Serve
Our coupling nuts are relied upon by:
Construction & Structural Engineering Firms
Electrical & HVAC Infrastructure
OEMs in Machinery Manufacturing
Renewable Energy Installers (Wind, Solar)
Oil & Gas Pipe Support Applications
General Industrial Maintenance & Repair Services
Documents Supplied
Every delivery from SM Fasteners includes:
Material Test Certificate (MTC 3.1)
Dimensional & Grade Compliance Sheet
Surface Treatment / Plating Certificate
Packing List, Invoice, and Traceability Code
RoHS / REACH Certificate (Optional)
Request a Quotation
For bulk or custom orders of Coupling Nuts, get in touch now:
📧 Email: susheel@smfastners.com
📞 Phone: +91 8968469570
💬 WhatsApp Chat: Click Here to Chat
SM Fasteners – Connecting Strength with Precision.