A sticky latch or rough key can be an early warning that something needs attention. The right lubricant may help where the manufacturer permits it, but the wrong product or too much of it can create further problems.
Check the exact lock’s instructions first
There is no universal lubricant for every lock. Some manufacturers recommend a dedicated lock spray or PTFE-based product; others specify a different material for particular mechanisms. Guidance on graphite and silicone also varies. A product labelled “lock lubricant” still needs to be suitable for your particular lock and application.
Spring latches
If the manufacturer permits lubrication of the exposed latch, remove accessible dirt with a soft cloth and apply only the small amount specified to the approved contact surfaces. Wipe off excess. Do not spray deep into the lock body. If the latch sticks, does not spring back or needs force to operate, arrange a mechanical inspection.
Bolts and strike plates
Use lubricant on exposed moving or contact surfaces only where the manufacturer directs. A bolt that scrapes the frame, binds or fails to enter its opening needs an alignment check. Adding more lubricant will not repair a sagging door, bent bolt or damaged gearbox.
Keyways and mechanical override cylinders
Use only the cylinder maker’s approved product and method, sparingly. Some instructions call for a small amount on the key blade before insertion; others specify a dedicated spray. Do not assume graphite, silicone or general-purpose oil is suitable. Do not mix products or flood the keyway. Stop if the key bends, catches badly or needs force.
Keep lubricant away from digital components
Never spray lubricant into the keypad, fingerprint reader, battery compartment, charging port or electronic housing. A digital lock may have mechanical parts that can be serviced, but that does not mean its motor or internal assembly should be sprayed. Leave internal servicing to a qualified technician following the manufacturer’s instructions.
Avoid household substitutes
Do not use cooking oil or improvise with grease, cleaners or an unidentified spray. General-purpose penetrating sprays are not automatically suitable as ongoing lock lubricants. Identify the correct maintenance product first, keep it away from finishes where required, and use the minimum specified amount.
How often should you lubricate?
Follow the maintenance interval for your exact product. Usage, exposure and environment vary, so a fixed schedule does not suit every lock. Combine any approved lubrication with checks for loose fittings, dirt, corrosion and door alignment. See our lock failure prevention guide for the wider checklist.
Manufacturer references
General guidance only. Your exact model’s manual takes priority.