The handle is the least important part of a lock. Here is how the three common lock types differ, and what to ask for on a main door.
A mortise lock sits in a pocket cut into the edge of the door; a cylindrical (bored) lock is the knob or lever set fitted through two drilled holes; a deadbolt is a bolt that can only be moved by a key or thumb-turn, not pushed back. Mortise locks suit solid main doors and can combine a latch and a deadbolt in one body. Cylindrical locksets are the usual bedroom and bathroom door hardware. A deadbolt adds resistance to forced entry. Whatever the body, the cylinder, the part the key goes into, matters most: a basic euro cylinder can be snapped, so on an entrance door choose an anti-snap cylinder with sacrificial sections.
Most people choose a lock by its handle. The handle is the least important part. What decides how secure and how durable a door is: how the lock body is fitted into the door, whether the bolt can be pushed back with a card or a blade, and how the cylinder resists being picked, drilled or snapped. Knowing the three common lock types helps you ask the right questions before a locksmith or a door supplier chooses for you.
| Mortise lock | Cylindrical (bored) lockset | Deadbolt | |
|---|---|---|---|
| How it is fitted | Into a pocket cut in the door edge | Through a large hole in the door face and a small one in the edge | Into the door, alone or inside a mortise body |
| Bolt | Latch and often a deadbolt in one body | Spring latch; some have a push-button lock | A solid bolt moved only by key or thumb-turn |
| Security | High, depends on the cylinder | Basic | Adds resistance to forced entry |
| Typical use | Main doors, solid timber and security doors | Bedrooms, bathrooms, stores | Main doors, alongside a latch |
| Door needed | Thick enough, solid edge | Most doors, including hollow-core | Solid door and frame |
A mortise lock takes its name from the pocket, the mortise, cut into the edge of the door to hold the lock body. Wikipedia makes a useful point: “mortise” describes only how the lock is fitted, and says nothing about its quality or key mechanism. A cheap mortise lock with a weak cylinder is still a weak lock.
A good mortise body can carry a sprung latch and a separate locking bolt, operated by handles and a cylinder. It needs a solid door edge thick enough to take the pocket; cutting one into a thin or hollow-core door weakens the door around it. On a main door it is paired with a strong box keep or strike plate in the frame, because the bolt is only as strong as what it locks into.
The knob or lever set on most bedroom and bathroom doors is a cylindrical, or bored, lockset. It is fitted through a round hole in the face of the door and a smaller one into the edge for the latch. It is quick to install and replace, which is why it is everywhere. Its latch is sprung and bevelled, so it can often be pushed back with a card; that is fine for an internal door and not enough for an entrance.
Bathroom versions should have an emergency release on the outside so a locked-in child can be reached. Our door repair guide covers the common lockset failures.
Wikipedia defines a deadbolt as a bolt thrown into the door frame by a key or handle, which cannot be pushed back by force on the bolt itself, unlike a spring latch. That is what makes a door more resistant to forced entry, and why a deadbolt is often used to complement a spring latch on an entry door.
Single-cylinder deadbolts have a key outside and a thumb-turn inside. Double-cylinder deadbolts need a key on both sides, which stops someone reaching through a broken window to turn the knob, but the same article warns they can trap occupants in a fire unless the key is always to hand, and some fire codes do not allow them on exits. For a home, a thumb-turn inside is the safer choice.
Most modern locks use a pin-tumbler cylinder, the part your key goes into. Many use a euro profile cylinder, which is easy to change without replacing the lock body. That convenience has a weakness. Wikipedia explains lock snapping: applying strong torque to the cylinder, usually with locking pliers, until it breaks at its thinnest point, the centre fixing screw, and exposes the mechanism.
Anti-snap cylinders are designed with a sacrificial front section that breaks off and leaves enough of the mechanism behind to keep the door locked. The same article notes that cylinders meeting Sold Secure SS312 Diamond or TS007 3 Star are designed to resist drilling, picking, bumping, snapping and plug extraction, and that they should be paired with security door furniture.
| Door | Sensible lock | Why |
|---|---|---|
| Main entrance (solid door) | Mortise lock with deadbolt, anti-snap cylinder, strong strike plate | The door that is actually attacked |
| Grille gate in front | Heavy-duty gate lock or padlock suited to the gate | The first barrier |
| Bedroom | Cylindrical lever set with privacy lock | Convenience, not security |
| Bathroom | Privacy set with outside emergency release | A locked-in child can be reached |
| Store room or utility | Cylindrical keyed lockset | Keeps children and visitors out |
| Rental unit | Euro cylinder that can be changed between tenants | Rekey or swap without a new lock body |
A strong bolt in a weak frame fails at the frame. A kicked door usually splits the jamb around the strike plate rather than breaking the lock. Check that the frame is solid and well anchored, that the strike plate is fixed with long screws into the structure, and that the hinges are sound. Our main door materials guide and security door guide cover the door and frame side.
ClickBina’s locksmith guide publishes these indicative Klang Valley figures:
| Job | Indicative price | Notes |
|---|---|---|
| Lockset or door knob replacement (labour) | RM50 – RM120 | Hardware RM30 – RM150 extra |
| Frame reinforcement or replacement | Adds RM300 – RM800 | Where the frame is timber, weak or poorly anchored |
WhatsApp us your job details for a quote — we reply within the hour.
💬 WhatsApp for a quotePremium mortise locks and certified cylinders are priced by brand and grade, so they are quoted with the door. Our locksmith guide lists the other jobs.
A lock change on a main door often turns into a frame repair, a new strike plate or a door refinish. ClickBina is an experienced KL & Selangor contractor that handles whole-house refurbishment and coordinates the trades on one job. WhatsApp us your job details for a quote: which door, what lock is there now, and whether you want a like-for-like swap or an upgrade. We reply within the hour, the price we agree is a flat price with no hidden charges, and a site visit is RM150, waived if you go ahead.
How we estimated prices: every RM figure is quoted unchanged from the ClickBina guide named above; they are typical Klang Valley ranges for 2026, not fixed rates.
WhatsApp us your job details for a quote — we reply within the hour.
💬 WhatsApp for a quoteTell us what you need — we reply within the hour.