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.

Raised Countersunk 2-Hole Machine Screw

Product Details

Raised Countersunk A2 Stainless Steel 2-Hole Machine Screw

Popular aesthetically pleasing drive for any two-way application.

This drive system, sometimes known as Snake Eye®, or Pig Nose is designed for low to medium torque applications. It has 2 holes drilled into the head which requires a unique 2-pin matching driver to install and remove it.

  • Full range of Self Tapping and Metric Machine Screws stocked in A2 Stainless Steel
  • Other styles of fasteners available in the 2-Hole drive system: Barrel Nuts, Male & Female Bolts, Grub Screws, Glass Screws, Large Disc Head Screws

Click to view technical data.


Security Rating Explained

Size Length Material Driver Size Part No. Small Box Qty
M3.5 12mm A2 Stainless Steel TH4 THRM3512 100
M3.5 25mm A2 Stainless Steel TH4 THRM3525 100
M3.5 30mm A2 Stainless Steel TH4 THRM3530 100
M3.5 40mm A2 Stainless Steel TH4 THRM3540 100
M3.5 50mm A2 Stainless Steel TH4 THRM3550 100


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