How to Choose the Right Door Lock: Handle Lock vs Mortise Lock vs Rim Lock

Why the lock type matters

Not every door needs the same kind of lock. The right choice depends on the door material, how the lock is fitted, and how much security you need. The three most common types you'll find in a hardware shop are the handle lock, the mortise lock, and the rim lock - and mixing them up is one of the most common buying mistakes. This guide walks through how each one works, where it fits best, and what to check before you buy.

Handle locks and bored locksets

“Handle lock” is a broad shop description: handles can be paired with different locking mechanisms. A cylindrical or tubular bored lockset normally fits through prepared holes in the door face and edge. Confirm the exact construction and function rather than treating every handled lock as cylindrical.

• Check the cross-bore, backset, latch preparation and door thickness.
• Confirm whether it is passage, privacy, keyed entrance or another function.
• A spring latch is not a separate deadbolt. Check what the exact model includes.
• The fitting type alone does not establish durability or security.

Mortise lock

A mortise lock's body fits into a prepared pocket in the door edge. It can have different latch, bolt and operating functions, with compatible handles and cylinders selected for the exact case.

Measure the case, backset, faceplate, handle-to-cylinder centres and door thickness. Confirm the door can accept the preparation. Do not assume every mortise lock is stronger than every cylindrical model; compare the documented exact products and the complete fitted assembly.

Rim lock

A rim lock is mounted on the surface of the door rather than cut into it, usually on the inside face, and is paired with a rim cylinder or knob on the outside. It's a practical option when you don't want to (or can't) cut into the door itself - useful on thin doors, added security on an existing door, or as a second lock alongside a handle or mortise lock.

• Good for: wooden doors where you want to avoid mortising, added or secondary locks, thinner doors that can't take a mortise pocket
• Fitting: surface-mounted, no deep cutting required - just screws and a hole for the cylinder spindle
• Typical strength: varies by model; many rim locks deadlock (the bolt can't be forced back once thrown), which makes them a genuinely useful second layer rather than just a backup

How "duty rating" works

“Heavy duty” or “main-door” packaging language is not evidence of an independently tested grade. Ask for the exact model's documented standard, grade and intended use when these matter. Consider the lock, cylinder, strike, frame, fixing method and opening requirements together.

Schlage's cylindrical and mortise ranges include model-specific graded products in both types. Those grades do not apply to other locks in MJ Trader's catalogue.

Quick comparison

• Existing bored preparation: check a compatible bored lockset's dimensions and function.
• Existing mortise pocket: compare the case, faceplate, centres and cylinder arrangement.
• Surface-mounted requirement: assess a rim lock and its keep position; use our rim lock and night latch guide.
• Entrance or specified doorset: choose the complete function and documented hardware requirement, not a universally “best” lock type.

Buying tips

• Measure the backset - the distance from the door edge to the centre of the handle or cylinder - before you buy. Sizes vary between models, and a mismatched backset means the lock won't sit right.
• Check the door thickness. Mortise locks in particular need enough timber depth to take the lock body without weakening the door.
• Confirm the handing (left or right opening) if the model needs it - most modern handle locks are reversible, but some mortise and rim locks aren't.
• Describe the exposure. Ask for the exact material, finish and suitability for the installation, including outdoor or coastal use where relevant. Appearance is not proof of material grade.

Common questions

Can I replace a handle lock with a mortise lock later?

Only after checking the existing holes, door material, thickness and proposed pocket. Conversion can require door repair or new preparation. Have the fitter check feasibility before choosing the replacement; a change of fitting type alone does not establish a security improvement.

Do I need a separate deadbolt if I already have a handle lock?

It depends on the existing function, opening requirements and complete doorset. Ask the fitter to assess the exact lock and any proposed additional hardware, including how people will exit. A general comparison does not approve an extra lock for every entrance.

How often should I oil a lock?

Follow the exact lock and cylinder manufacturer's maintenance instructions. Use only the specified product and interval; oil, graphite and silicone are not universal recommendations. Master Lock's care guidance illustrates why model instructions matter.

Send a clear enquiry from anywhere in Pakistan

Include the exact product or old-part reference, photographs, measurements, quantity and delivery city. You can Request Quote without visiting a shop first. Companies can use Business Supply for formal quotations and onboarding requirements. Email drawings or a parts list to adminmjtrader@gmail.com using the quotation-email action below. Confirm availability, delivery charges and timing, or your chosen collection branch, before ordering or travelling.

Technical reference

Schlage’s mechanical-lock overview distinguishes bored, tubular and mortise arrangements. It explains terminology, not the certification or availability of MJ Trader products.