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Internal cylinders are usually attached to rim locks mounted on glass doors. If there are no glass inserts in the door, a knob is often used instead of an internal cylinder. A door with a rim lock therefore has at least one outer cylinder. Glass doors with rim locks...

Turn-knob cylinders are profile cylinders. They differ from a conventional standard profile cylinder in that with a turn-knob cylinder, the door is opened or closed from the inside by turning the knob. From the outside, the door is locked or unlocked using a key, as...

The door leaf thickness indicates the thickness of the door leaf and is a key factor when choosing the right locking cylinder. Indoors, a standard room door or standard door is typically around 40 millimeters thick. However, outdoors, especially for entrance doors, a...

The door thickness, also known as the door leaf thickness in technical jargon, indicates the thickness of the door leaf. A normal room door or a standard interior door has a door thickness of around 40 millimeters. Entrance doors or exterior doors have a greater door...

Cylinder protrusion refers to the protrusion or projection of a locking cylinder from the door leaf (the door surface). This determines which cylinder length and which fitting should be used for a door. Even short cylinders can have a protrusion of a few millimeters,...

A cylinder breaker is a special tool used by emergency locksmiths that can be used to break off locking cylinders that protrude only a few millimeters. To prevent deformation after repeated use, the breaker is usually made of high-quality steel. Many breaker bars can...

Oval cylinders, or cylinders with an oval shape, are sometimes used for furniture, filing cabinets, drawer cabinets, and the like. These are often push-type cylinders that lock the cabinet simply by applying pressure or simply pushing it in. Additional locking is not...

Some doors have a rim lock that is screwed to the door from the inside. Opening this rim lock requires an external cylinder. This external cylinder is screwed to the inside of the door. The lock is unlocked or locked with the help of a metal tongue as soon as the key...

Not so long ago, round cylinders, or rather cylinders with a round shape, were very well known and widespread in West Germany. However, the problem was that manufacturers used their own dimensions and systems for their respective round cylinders. Therefore, it's...

The cylinder core is precisely the component of a cylinder (profile cylinder) into which the key is inserted in order to unlock the lock with one or two key turns (locking turns). The cylinder core rotates when the key is turned. It also contains all the tumblers...