SHEAR NUT

Shear nuts (also known as snap-off nuts) are high-security, permanent fasteners designed to prevent theft and unauthorised tampering.

They are unique because they are "one-way" fixings: once installed, the part used to tighten them breaks off, leaving a smooth, tamper-proof cone that cannot be gripped by standard tools.

How They Work

  • Two-Part Design: A shear nut consists of a threaded conical base topped by a standard hexagonal nut head.
  • Self-Shearing Mechanism: You install them using standard tools like a spanner or socket. When the nut reaches a specific, pre-determined torque level, the hexagonal head "shears" or snaps off.
  • The Result: All that remains is a smooth, domed cone that is nearly impossible to grip or remove with conventional wrenches.

Key Specifications

Shear nuts are available in various materials and sizes to suit different environments:

  • Materials: Common options include A2 Stainless Steel for corrosion resistance, Galvanised Steel for heavy-duty outdoor use, and Zinc Plated Steel for general purpose.
  • Torque Breaking Points: Different sizes require different forces to shear off. For example, an M6 nut typically snaps at 7–14 Nm, while an M12 nut requires 35–45 Nm.
  • Common Sizes: Standard metric sizes range from M4 to M20.

Typical Applications

These are primarily used in public areas or high-security settings where permanent fixing is essential

SHEAR NUT
STEEL

STEEL

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STAINLESS

STAINLESS

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