How do I measure cylinder length?

Measure from each face of the door to the centre of the cylinder screw separately. The cylinder must not protrude more than 3 mm on either face.

Why is a ball-pin cylinder more secure?

It carries additional ball pins in the mechanism, which makes the key harder to copy and gives real resistance to picking.

What does an anti-pick cylinder do?

When it detects an attack it blocks the mechanism: the cylinder can no longer be turned and the lock stays shut. It then has to be replaced.

Can I change the cylinder without changing the lock?

Yes. The cylinder is independent of the mortise lock body; one screw releases it and a replacement of the same length and offset goes straight in.

How is a master key system ordered?

With a door list and an access chart showing which key opens which doors. Cylinders are made to that chart, so adding doors later needs planning.

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Lock Cylinders

The cylinder is the heart of the lock — the part the key turns — and it largely sets the security level of the door. This page covers how cylinder length is chosen, what ball-pin and anti-pick mechanisms do, and what a master-keyed cylinder is for. The catalogue holds 39 models from 68 to 90 mm.

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Choosing the length: 68, 76, 83, 90 mm

Cylinder length follows the thickness of the door leaf and the position of the lock inside it. The rule is simple: the cylinder must not protrude more than 3 mm past the rose on either face. A proud cylinder can be gripped with pliers and snapped; one that is too short sits inside the rose and the key will not turn fully.

The fixing screw hole is not always central — a 68 mm cylinder may be split 31+37. Measure the inside and outside faces separately before ordering.

Length	Typical use
68 mm	Interior door, standard leaf
76 mm	Apartment entrance door
83 mm	Thick leaf, steel door
90 mm	Insulated and multi-layer leaves

Standard, ball-pin, anti-pick and master-keyed

A standard cylinder has its pins in a single row. A ball-pin cylinder adds ball pins: harder to copy and far more resistant to picking. Anti-pick cylinders block the mechanism outright when an attack is detected, and latching versions keep the lock shut even if the cylinder is snapped.

A master-keyed cylinder lets every door in a building open with its own key while a single master key opens them all. These orders are taken with a door list and an access chart.

Frequently Asked Questions

How do I measure cylinder length?
Measure from each face of the door to the centre of the cylinder screw separately. The cylinder must not protrude more than 3 mm on either face.
Why is a ball-pin cylinder more secure?
It carries additional ball pins in the mechanism, which makes the key harder to copy and gives real resistance to picking.
What does an anti-pick cylinder do?
When it detects an attack it blocks the mechanism: the cylinder can no longer be turned and the lock stays shut. It then has to be replaced.
Can I change the cylinder without changing the lock?
Yes. The cylinder is independent of the mortise lock body; one screw releases it and a replacement of the same length and offset goes straight in.
How is a master key system ordered?
With a door list and an access chart showing which key opens which doors. Cylinders are made to that chart, so adding doors later needs planning.