Scar & Adaptor Plates for Smart Locks

When a new lock does not sit exactly where the old one did, a scar plate covers the holes left behind and an adaptor plate lets the new lock mount to the existing prep. Almost always faster, neater and cheaper than filling and re-drilling a door.

Scar plate or adaptor plate?

Sizing

• Measure the full extent of the existing damage, including the cylinder hole, spindle hole and any fixing holes.
• Check the plate is large enough to cover everything with a margin, but not so large that it fouls the door stop or glazing bead.
• Confirm the plate does not clash with the new lock escutcheon footprint.
• Match the finish to the new hardware, since the plate is visible for the life of the door.

Fire doors are a special case. A plate fitted to a fire door has to be part of the certified configuration, and it cannot be used to cover a penetration that should not have been made. Fire door scar plates.

Related categories

Vertical Push or Pull Handle · Fire Doors · Mortice Locks · All Accessories

Common questions

Do I need a scar plate?
If the new lock leaves any of the old holes or wear marks visible, yes. Check both faces of the door before deciding, since the internal side is frequently overlooked.

Can a scar plate go on both sides of the door?
Yes, and often it should. Damage is usually visible on both faces, and matching plates look deliberate rather than remedial.

Will it work on an aluminium door?
Yes, with the correct fixings for the substrate. On thin aluminium, check that the plate spans to solid material rather than bridging a large opening.

Guides and reference

Scar plates: what they are and when you need one · Ch 02 - Existing hardware