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The Extra Class 750, commonly referred to by its model number EC750 is a Euro profile cylinder made by ABUS. It is a dimple lock that uses the flat side of the key blade as a bitting area.

ABUS EC750 Keyway.jpg
Name ABUS EC750
Manufacturer ABUS
Lock Type Cylinder
Lock Design Pin-tumbler; Euro_Profile; Dimple
# of Components 6 plus 4 passive
Component Type Pin-tumbler
Related Locks

Principles of operation

The ABUS EC750 utilizes dimple keys but functions the same as a standard pin-tumbler lock. The key is bitted on both sides of the blade and is reversible. The lock uses ten chambers for pin-tumbler stacks. Four chambers in a row on the top of the lock and six chambers in a row on the bottom. Each of those chambers, in the bottom, contains a set of key pin, driver, and spring. The top Pins are passive. To open the lock, all ten pin-tumblers must be aligned at the shear line. If you pick the lock, you don't need to lift the top four pins. (See also Pin-tumbler, Principles of operation)

ABUS utilizes a variety of security features to deter picking. All six key pins are torpedoes, fife of the brass driver pins in the bottom row are spooled and one is a serrated security pin. The four pins of the top row are not directly opposite pins from the bottom row, and don't touch in the middle when the key is not present. They are not provided with springs.

Disassembly instructions

ATTENTION! It is highly recommended to use a shim! The lock has a Trap hole. If a driver pin gets stuck in it, the lock is bricked! (See picture of components.)

The use of a pinning shoe is the preferred method for disassembling a double Euro profile cylinder. Another method is to use a segmented follower. The c-clips retaining both cores must first be removed, and then both cores can be pulled out slightly in order to remove the center cam. One core should be rotated to approximately 4:30 or 7:30 o'clock position -- 135 degrees either clockwise or counter-clockwise -- once the cam is removed. This allows the core to be removed without driver pins entering gaps for the cam clutch. At that point, a segmented follower can be used to remove the core.

Locks not intended for installation and use can be disassembled in a quick but destructive procedure. The cylinder housing itself can be cut in the middle using a hacksaw or grinder. The cam will no longer be held in place and can be removed. The resulting two cut half euro cylinders can then be disassembled as outlined above.



The ABUS EC750 is vulnerable to one or more of the following:

See also