Most people never think about their locks until something goes wrong — and by that point, what could have been a simple maintenance job has often become an emergency callout. Locks and door mechanisms are mechanical components that benefit from basic, occasional attention. Here's what to do, what not to do, and what signs to watch for.
Lubrication: The Most Important Thing You Can Do
The single most effective maintenance task for most locks and door mechanisms is lubrication. Applied correctly and with the right product, it keeps components moving freely, reduces wear, prevents corrosion, and dramatically reduces the risk of a stiff key or failing mechanism.
The frequency depends on usage and exposure to weather, but as a guide: lubricate external door locks and mechanisms once or twice a year. Once in autumn before the cold weather sets in, and once in spring, is a sensible routine.
What to Use
- Euro cylinders and mortice lock keyholes: Use a dry PTFE spray or a graphite-based lubricant. Squirt a small amount into the keyhole, then insert and work the key several times to distribute it through the mechanism
- uPVC door mechanisms (the multi-point locking strip): Apply a silicone-based lubricant or a dedicated door mechanism lubricant to all the visible moving parts along the door edge — the hooks, rollers, and any exposed gearing. Work the handle while applying it to distribute the lubricant through the mechanism
- Hinges: A light machine oil or silicone spray on the hinge pins prevents squeaking and keeps movement smooth
- Strike plates and keeps: Wipe these clean and apply a small amount of silicone spray to the surfaces the locking points engage with
What Not to Use
Avoid WD-40 on locks and mechanisms. It's a water displacer rather than a proper lubricant, and it leaves an oily residue that attracts dust and dirt over time — which can actually make stiffness worse. It's also not suitable for plastic components. For a one-off emergency fix it's better than nothing, but don't use it as a maintenance product.
Keeping Locks Clean
External locks are exposed to rain, grit, and whatever else the weather brings. Dirt can accumulate inside cylinders and mechanisms, causing stiffness and increasing wear on internal components. Wiping the visible parts of external locks and mechanisms with a damp cloth occasionally — and making sure strike plates and keeps are clear of debris before lubricating — makes a meaningful difference to how long the hardware lasts.
Checking Door Alignment
Door alignment drifts over time. Hinges loosen, doors settle, frames shift slightly with the seasons. A door that's even a few millimetres out of alignment puts extra stress on the mechanism every time you lock it, accelerating wear and eventually preventing it from locking at all.
Periodically check:
- Whether the door closes smoothly without lifting or dropping
- Whether the handle lifts without needing significant upward force on the door
- Whether there are visible gaps at the top or bottom of the door that weren't there before
- Whether the key turns smoothly in both directions without stiffness
Catching alignment issues early — when a hinge screw just needs tightening or a strike plate needs slight adjustment — is far cheaper than dealing with a failed mechanism after months of additional wear.
Key Maintenance
Keys wear too, particularly if you only have one and use it daily for years. A worn key may still open the lock most of the time but is more likely to stick, be hard to remove, or eventually snap under the pressure of a slightly stiff lock.
- Get a duplicate key cut from the original — not from a copy of a copy. Keys cut from well-worn originals or from other copies lose precision with each generation
- If a key starts to feel looser or stiffer than it used to in a specific lock, have both the key and the lock assessed before a snap happens
- Don't carry your door key on a keyring with heavy items that pull on it when it's in the lock — this adds unnecessary stress to the cylinder
A good test: Once a year, go around your external doors and test each lock with the key. It should insert smoothly, turn without significant resistance, and withdraw cleanly. If any stage of that feels wrong, address it before it becomes a problem. The same goes for window locks — they should operate easily with their key, with no stiffness or binding.
Signs That Maintenance Has Been Left Too Long
Some things that start as a maintenance issue can cross into replacement territory if left long enough:
- A key that's very stiff to turn, or that needs jiggling to engage, suggests a cylinder that may be worn beyond lubrication helping
- A handle that's noticeably looser than it used to be suggests gearbox wear that will eventually result in failure
- Visible rust or corrosion on external locking points suggests the protective coating has failed and the components may be weakening
- A lock that works fine in summer but fails every winter has an alignment or tolerance issue that will eventually stop being seasonal
In most cases, catching these signs early means a repair rather than an emergency replacement.
Lock Servicing in Stourbridge
If you'd like your locks checked over, lubricated, and adjusted as part of a routine maintenance visit, AMP Lock covers Stourbridge, Halesowen, Dudley, Kingswinford, Hagley, Kidderminster, and surrounding areas. Call or WhatsApp on 07961 169 681 — no call-out fee, and pricing confirmed before we start.