Rim Lock Door Knobs

What Is a Rim Lock Door Knob?

A rim lock door knob is specifically configured to operate a lock or latch mounted on the surface of a door. The lock case is visible on one side, rather than being recessed into the door edge like a mortice latch or sash lock.

Because the rim lock occupies the position where a rose would normally be fitted, a dedicated rim knob set commonly uses one rose on the timber side of the door. The knob on the lock side sits against the rim lock case.

Rim Lock Knobs vs Mortice Door Knobs

Rim and mortice door knobs can appear similar, but their fitting arrangements are different:

• Rim lock door knobs are designed for a surface-mounted lock case and normally require a spindle long enough to pass through both the door and the lock.
• Mortice door knobs are designed to operate a latch or lock recessed into the door edge and normally have a rose fitted to each face of the door.

A mortice knob set with two permanently fixed roses may not fit correctly against a rim lock. Choose a product explicitly described as suitable for rim locks rather than relying on appearance alone.

How to Check Which Lock You Have

Look at the inside face of the door. If the lock body is mounted visibly on the surface, it is a rim lock or rim latch. If the mechanism is hidden inside the door and only a narrow faceplate is visible on the door edge, it is a mortice lock or latch.

Some rim locks include a key-operated privacy function, while rim latches only hold the door closed. The door knob operates the sprung latch in either arrangement; it does not necessarily operate the locking bolt.

What to Measure Before Ordering

Before choosing a rim lock door knob set, check:

• The thickness of the timber door
• The depth of the rim lock case
• The total spindle length required to pass through the door and lock
• The square spindle size required by the lock follower
• The diameter of the knob and rose plate
• The clearance between the knob, door frame and surrounding mouldings
• Whether the knob, rose and spindle arrangement suits the selected rim lock

If replacing an existing set, compare the new product drawing with the original knob and spindle. A longer spindle may be required for thicker doors or deeper rim lock cases, but it must still match the lock and knob fittings.

Fixed Knobs, Removable Knobs and Loose Roses

Some rim knob sets have one knob fixed to the spindle and a second removable knob secured after installation. Others may use a different spindle and fixing arrangement. Follow the instructions for the individual product and do not assume that every knob can be removed from either end.

A loose or removable rose is useful because it can be omitted from the rim lock side while remaining fitted to the timber side. Check the product contents to confirm the number and type of roses supplied.

Materials and Finishes

The collection includes traditional materials and finishes such as:

• Rosewood and ebonised wooden door knobs
• Polished, aged and satin brass
• Polished chrome and polished nickel
• Satin nickel and matt bronze
• Cast iron and dark traditional finishes

Available options vary between designs. Check the individual product listing for its exact material, finish and care requirements.

Are Rim Lock Door Knobs Suitable for External Doors?

This collection is principally intended for traditional internal doors. The associated rim locks generally provide privacy rather than modern entrance-door security and should not be treated as substitutes for an appropriately certified external lock.

If you are choosing hardware for a front or external door, check the required security standard and any conditions set by your insurer.

Helpful Rim Lock Guides

For a detailed explanation of the fitting arrangement, read Rim Lock Door Knobs Explained.

If you are deciding between surface-mounted and recessed door hardware, see Rim Lock vs Mortice Door Knobs.

For a wider overview, read Door Knobs Explained: The Complete Guide. Our How to Fit a Rim Lock guide provides additional installation advice.

Refer to each product listing for exact dimensions, spindle details, supplied components and fitting instructions.