As standard, cylinders with thumbturn is supplied with our smooth elliptical turn with a thumb slot. A range of alternative turns are available to order to allow you to complement specific hardware.
There are additional functional options available. An internal clutch mechanism can be included that disengages the key from the operation of the thumbturn. This allows the door to be unlocked even if the thumbturn is being held in the locked position on the inside. This makes it ideal for use in secure hospitals for example where there is a risk that an individual may block access to an area.
The classroom function is a variation of the clutch cylinder with the added feature that the turn can only ‘Unlock’ the door. This is typically used in schools to prevent mischief by students locking doors. The direction of locking (clockwise or anticlockwise) must be specified with Classroom Function.
NOTE: Dimensioning these cylinders is with the external side (key side) first followed by the inside (thumbturn side) dimension, with the size taken from the centre of the fixing hole to the face of the cylinder
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