BS EN 12320 BS EN 12320 : 2001Building hardware – padlocks and padlock fittings UNION products applicable: high security padlocks (section 3A) GUIDE TO CLASSIFICATION BS EN 12320 classifies padlocks and padlock fittings by using a 7 digit coding system. Each digit refers to a particular feature of the product measured against the standard's performance requirements. Digit 1 - Category of useNo requirement Digit 2 - Durability (no. of test cycles)No requirement Digit 3 - Door massNo requirement Digit 4 - Fire resistanceNo requirement Digit 5 - Safety in useNo requirement Digit 6 - Corrosion resistanceProducts are classified in accordance with EN1670:1998- grade 1: internal applications- grade 3*: external applications*The standard has been published containing an error. BSI is making arrangements to correct this. Digit 7 - Security RequirementsThere are 6 grades of security, where 6 is the highest and 1 is the lowest Products are tested to the following criteria Minimum number of effective differs Non-interpassing of keys Resistance to force on cylinder plug or locking mechanism Resistance to torque on cylinder plug or locking mechanism Resistance of shackle or staple to pulling, twisting and cutting Resistance of padlock body, shackle and staple to impact, drilling and sawing EXAMPLE The following marking denotes a padlock or padlock fitting which is suitable for use on internal or external applications and has a security grade 4: - - - - - 3 4 Box 1 - 5 - No classification Box 6: Corrosion grade 3 Box 7: Security grade 4 Only the classified requirements of BS EN 12320 are listed in UNION padlock product literature.