Shear Nut

The Stainless Steel Breakaway Security Nut is a one-way irreversible anti-theft fastener specially developed for outdoor public infrastructure to prevent unauthorized disassembly and component theft. It adopts an integrated two-section structure: a hexagonal wrench drive base and a smooth dome locking head connected by a thin shear neck. During installation, the hexagonal segment will shear off automatically once reaching the designated tightening torque, leaving only a smooth round dome without flat gripping surfaces for spanners, sockets or pliers to operate.

Fabricated from premium 304 stainless steel, this shear nut features high tensile strength, excellent weather resistance and permanent rust-proof performance. The surface is treated with polishing and passivation to form a dense inert protective film, which effectively resists rain erosion, salt fog, UV radiation and atmospheric oxidation, maintaining stable mechanical properties under long-term outdoor exposure without rust failure.

The proprietary breakable shear neck realizes one-way locking function. When tightening torque hits the preset threshold, the hexagonal wrench holding part fractures cleanly, leaving a seamless smooth round top with no leverage points for removal tools. Precisely machined internal threads fit standard bolts tightly to sustain stable clamping force after shear-off; the one-piece forming process prevents separation loosening caused by wind load and long-term vibration.

Breakaway security nuts are widely applied to highway guardrail fixing, traffic sign mounting, municipal outdoor facility assembly, park fitness equipment installation, bridge auxiliary component fastening and all public infrastructure requiring anti-theft protection. Its single-use irreversible installation feature eliminates risks of stolen or dismantled public facilities, significantly cutting long-term maintenance and replacement costs for municipal and traffic engineering projects.

We provide complete OEM and ODM custom manufacturing services, supporting tailor-made production based on customer technical drawings, physical samples and customized shear torque parameters. Custom thread sizes, shear neck thickness, breakaway torque values and exclusive export packaging options are available to satisfy diverse municipal and traffic engineering demands. Private laser marking and custom brand printing services are also offered for traffic hardware distributors, municipal engineering contractors and outdoor facility manufacturers.

Each Stainless Steel Breakaway Security Nut is manufactured under strict anti-theft fastener quality control standards. All finished nuts pass full dimensional inspection, thread precision testing, shear torque sampling verification and surface anti-corrosion passivation performance check before shipment, to ensure precise thread tolerance, stable controllable breakaway torque and durable long-term rust-proof performance across every production batch.