A High Security Padlock is not defined only by material or design, but also by standardized testing and certification systems. These systems evaluate how well a lock resists different types of attacks.

One widely recognized framework is the EN 12320 rating system, which classifies padlocks on a scale based on resistance to cutting, drilling, pulling, and twisting. Higher grades indicate stronger resistance and longer attack delay times.

Testing procedures typically include:

Cutting resistance tests using hydraulic bolt cutters

Drill resistance using carbide-tipped drill bits

Pull force tests exceeding several kilonewtons

Torque resistance evaluation for twisting attacks

Environmental exposure tests for corrosion and freezing

In higher-grade locks, shackle materials must withstand forces above 10–15 kN without deformation. Lock bodies are also tested for impact resistance using repeated hammer strikes.

Key system security is another critical factor. High-security systems often limit key duplication and require authorization for reproduction. This is essential in commercial environments where multiple users need controlled access.

A High Security Padlock may also be evaluated under military or industrial specifications in specialized applications, where stricter key control and mechanical resistance standards are enforced.

Typical rating characteristics include:

Grade-based resistance classification (low to high security levels)

Certified pick resistance testing

Controlled key system designation

Environmental durability classification

These standards help users select the appropriate lock based on risk level rather than appearance alone. A higher-rated padlock does not guarantee invulnerability, but it significantly increases the time, effort, and tools required for forced entry, which is the core principle of physical security design.