Our bright zinc plated steel security breakaway shear nut is a high-performance security fastener engineered for permanent, tamper-proof fastening solutions. Also called breakaway nut or snap-off nut, it features a hexagonal head that shears off precisely at a preset tightening torque. After shearing, a smooth, dome-shaped surface remains, eliminating gripping points and making unauthorized removal nearly impossible. Available in diameters ranging from 1/4''-3-1/2'' and M3-M72, with threads in M, UNC, and UNF standards, this shear nut is crafted from carbon steel, alloy steel, or stainless steel, complying with IFI-101, SAE J995, and other top industry grades. Its versatile finish options include zinc plating, black oxide, H.D.G, and PTFE, catering to diverse application needs in public infrastructure, automotive, construction, and machinery sectors.
| Diameter: | 1/4''-3-1/2''; M3-M72 |
| Material: | Carbon Steel, Alloy Steel, Stainless Steel |
| Grade: | IFI-101,IFI-100/107 2007,SAE J995 Gr.2, 5,8; CL4, 5, 6, 8, 10, 12 |
| Thread: | M, UNC, UNF |
| Finish: | Plain,Black oxide, Zinc Plated(Clear/Blue/Yellow/Black), H.D.G, Nickel, Chrome,PTFE,Dacromet,Geomet,Magni,Zinc Nickel,Zinteck. |
| Packing: | bulk in cartons (25kg Max.)+wood Pallet or according to customer special demand |
| Application: | Structural Steel; Metal Buliding; Oil&Gas;Tower&Pole; Wind Energy; Mechanical Machine; Automobile: Home Decorating |
| Equipments: | Caliper, Go&No-go gauge, Tensile test machine, Hardness tester, Salt spraying tester, H.D.G thickness tester, 3D detector, Projector, Magnetic flaw detecter |
| Supply Ability: | 1000 tons per month |
| MinimumOrder: | according to customer demand |
| Trade Term: | FOB/CIF/CFR/CNF/EXW/DDU/DDP |
The bright zinc plated shear nut boasts a sleek, corrosion-resistant zinc-plated surface, delivering a bright, uniform finish that enhances both aesthetics and durability. Its structure combines a standard hexagonal driving section for easy installation with a tapered lower body that transitions to a smooth dome after shearing. Unlike regular nuts, its design prioritizes security— the hexagonal head is precisely calibrated to snap cleanly without damaging the bolt or fastened material. Compact and robust, it fits seamlessly into standard bolt assemblies, making it a drop-in security upgrade for conventional fastening systems.
The defining advantage of our security shear nut is its one-way fastening mechanism. Once the hexagonal head shears off, no standard tool can grip the smooth dome, effectively preventing theft, vandalism, and unauthorized tampering—ideal for street signs, lighting fixtures, and railway components.
With multiple material options and a wide diameter range, it adapts to structural steel, metal buildings, wind energy equipment, and automotive parts, meeting diverse industrial requirements.
The bright zinc plating provides high rust and corrosion protection, extending service life even in harsh outdoor or industrial environments.
No specialized tools are needed for installation. Simply thread the nut onto a bolt and tighten with a standard wrench or socket until the head shears off, streamlining on-site operations.
We uphold strict quality control across the entire production process. Each shear nut undergoes multi-stage inspections, from raw material testing to finished product verification. Our factory is equipped with professional testing equipment, including calipers, tensile test machines, hardness testers, and salt spraying testers, ensuring every unit meets international standards. For finished products, we implement 100% inspection according to customer requirements, guaranteeing consistent performance and reliability. With a monthly supply capacity of 1000 tons, we maintain stable production quality while supporting flexible minimum order quantities.
We are a professional direct manufacturer with our own international sales department, handling production and sales in-house to ensure competitive pricing and quality control.
Yes, we offer comprehensive customization services, including tailored sizes, materials, finishes, and torque specifications to meet unique customer needs.
Our products are widely used in structural steel projects, metal buildings, oil & gas facilities, wind energy equipment, automotive manufacturing, home decorating, and public infrastructure construction.
