Security Ratings Explained
Security Ratings

Hafren Security Ratings

Security Level 1

Entry Level
Fasteners offer protection from vandalism and opportunistic crime. Drivers can be purchased by the general public.

Security Level 2

Enhanced Security
Fasteners are less Common and less Recognizable. Driver Tooling is non-standard and Harder for the general public to buy.

Security Level 3

Medium Security
Rarer (less well-known) products. Supply of driver tooling is controlled, less readily available to buy, enhancing the security of the assembly.

Security Level 4

High Security
Either 1-way permanent fixing, or rare Hafren patented high security products requiring specialist tooling to remove (only available from Hafren approved distributors).

Security Level 5

Maximum Security
Highest security available. Products are either 1-way permanent fixings, or require bespoke exclusive, custom made driver tools to remove.

A4 Stainless Steel Shear Nut

Product Details

A4 Stainless Steel Shear Nuts

The Shear System is a high security permanent fastener.

Shear Nuts have a hexagon part which shears off at a predetermined torque. Installed using standard hex socket or spanner. Once
installed, the Shear Nut leaves a tamper resistant cone.

Also stocked in;

  • Zinc Plated (CR-3) Steel
  • Galvanised Steel
  • A2 Stainless Steel

Click to view technical data


Security Rating Explained

Size Material Part No. Small Box Qty
M6 A4 Stainless Steel SHN06-A4 100
M8 A4 Stainless Steel SHN08-A4 100
M10 A4 Stainless Steel SHN10-A4 100
M12 A4 Stainless Steel SHN12-A4 100
M16 A4 Stainless Steel SHN16-A4 100


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