Yale padlocks are tested against the European Standard EN 12320:2012 for padlocks and when they are tested to this standard, they are given a CEN rating (Central European Norm) of 1 to 6, one being the lowest security grade and 6 being the highest.
All Yale padlocks with keys (30mm and above) have a CEN rating. Most standard security padlocks have passed grade 1 or 2, high security padlocks have passed grade 2 & 3 and maximum security padlocks have passed grade 3 & 4. The tests are carried out to replicate all common forms of attack such as cutting, twisting and pulling of the shackle for your peace of mind.