Shear Nuts

Our Shear Nuts, also known as Tamper Proof Nuts, Security Shear Nuts, or Break Away Nuts, are a high-security fastening solution designed for permanent installations. Available in Stainless Steel, BZP (Bright Zinc Plated), and Galvanised finishes, these nuts provide a secure and reliable fixing method for a wide variety of applications.

The hexagonal head of a shear nut is designed to snap off during tightening, leaving behind a smooth, conical dome. This ensures a permanent, tamper-proof fastening that cannot be easily removed with standard tools.

Why Choose Stainless Steel, BZP, or Galvanised Shear Nuts?

• Stainless Steel Shear Nuts – Manufactured from A2 (304) stainless steel, these provide excellent corrosion resistance and are ideal for both indoor and outdoor use, even in harsh environments.
• BZP (Bright Zinc Plated) Shear Nuts – A cost-effective option, BZP offers a clean, bright finish and is suited to general indoor use where moderate corrosion resistance is sufficient.
• Galvanised Shear Nuts – With a thick protective zinc coating, galvanised versions are designed for maximum durability and long-term outdoor use, especially in exposed or industrial environments.

What are some common applications of Shear Nuts?

Shear nuts are most commonly used:

• With Bolts and Machine Screws to create secure, permanent fixings.
• On public-facing fastenings where tamper resistance is essential.
• In security-sensitive environments such as fencing, street furniture, gates, playgrounds, and access covers.

Key Product Features

• Available in Stainless Steel, BZP, and Galvanised finishes
• Tamper-proof design with break-away hex head
• Easy to install using standard tools
• Provides a permanent, non-removable fixing
• Recommended for use with threaded components

Frequently Asked Questions

What are shear nuts used for?

Shear nuts are used in applications where security is essential, preventing unauthorised tampering or removal. Once installed, they cannot be unscrewed with normal tools.

How do you install shear nuts?

Installation is straightforward—tighten the nut with a standard spanner or socket until the hex head shears off, leaving only the tamper-proof dome.

Which material should I choose?

• Use stainless steel for corrosion resistance in general environments.
• Choose BZP for cost-effective indoor security fixings.
• Opt for galvanised for maximum outdoor durability.

Sizes and Availability

Our standard shear nuts are available in metric sizes from M4 to M20. For the full range of sizes and finishes, see the product table below or contact our team for advice.

We also stock a wide selection of other Security Fasteners and Standard Nuts to suit your project.