A mortice door knob is a knob set designed to operate a latch or Lock body installed inside a rectangular pocket in the door edge. The Knobs connect through a square spindle, allowing either side to rotate the internal follower and retract the latch.

“Mortice” is the British spelling, while “mortise” is commonly used in North America. Both terms describe the recessed installation method.

Main Parts of a Mortice Knob Set

A complete assembly may contain:

• Two door knobs

• Square spindle

• Roses or backplates

• Fixing screws

• Mortice latch or lock

• Strike plate

• Keyhole escutcheons

• Cylinder or key mechanism

• Privacy turn where required

The knobs provide the user interface, but the mortice case determines the latch, locking function, backset, and internal spring action.

Not every decorative knob includes the mortice lock body. Buyers should confirm whether they are purchasing a knob set only or a complete door-hardware package.

How the Mechanism Works

Turning either knob rotates the spindle.

The spindle enters a square follower inside the mortice latch or lock. Rotation pulls the latch bolt into the door edge, allowing the door to open.

When the knob is released, the lock spring and any additional knob spring return the spindle and latch to their resting position.

A locking mortice case may also contain:

• Deadbolt

• Key lever mechanism

• Euro-profile cylinder preparation

• Bathroom privacy function

• Escape function

• Split spindle

• Rebate kit for paired doors

The selected function must match the room and access requirement.

Mortice Knob, Tubular Latch, and Rim Knob

Mortice knob is sometimes used broadly for a knob operating a recessed latch.

A traditional mortice lock has a larger case installed inside a deeper pocket. It can contain both a latch and a deadbolt.

A tubular latch uses a narrower cylindrical or rectangular body and is commonly fitted to simple passage doors.

A rim knob works with a surface-mounted rim lock fixed to the face of the door rather than inside a deep mortice.

These systems require different door preparation. One cannot be substituted for another without checking the cutout, backset, spindle, fixing positions, and strike.

Where Mortice Door Knobs Are Used

Mortice knobs are commonly selected for:

• Interior passage doors

• Bedrooms

• Bathrooms

• Offices

• Hotels

• Heritage-style doors

• Residential renovations

• Timber entrance doors

• Decorative double doors

Knobs can create a traditional or compact appearance, but they require enough space between the knob and door frame for comfortable hand clearance.

Lever handles may be easier to operate for users with limited grip strength. Accessibility requirements should be considered before specifying knobs for public buildings.

Important Measurements Before Purchasing

Backset

Backset is the distance from the door edge to the spindle center.

A mismatched backset changes the knob position and may require a new door cutout.

Case Size

The lock-case depth and height must fit the existing mortice.

Door Thickness

The spindle and through-bolts must suit the finished door thickness.

Spindle Size

The square spindle must fit the follower without excessive play.

Center Dimensions

A lock with a keyhole or cylinder has a defined distance between the spindle and locking center.

Handing and Latch Direction

Some latches are reversible, while others need the correct orientation before installation.

Recording these details prevents the common mistake of ordering a visually suitable knob that cannot operate the existing lock.

Installation Overview

Mark the spindle and keyhole positions from the lock template.

Cut the mortice carefully into the door edge and keep the case level. Drill the spindle and fixing holes without damaging the opposite door face.

Insert the lock and attach the faceplate.

Pass the spindle through the follower, position both knobs, and secure the roses or backplates. Avoid tightening one side so strongly that the knobs bind.

Fit the strike plate to the frame and test the latch while the door remains open.

A fire-rated, security, or exterior door may require approved hardware and professional installation.

Materials and Surface Finishes

Mortice knob sets can be produced in stainless steel, brass, aluminum, zinc alloy, or mixed constructions.

Surface directions may include:

• Satin

• Polished

• Matte black

• Antique finish

• Brushed metal

• PVD-type decorative colors

• Anodized aluminum

The finish should be selected according to use frequency, cleaning chemicals, humidity, and coordination with hinges, locks, and other door hardware.

Export Supply for Mortice Hardware Programs

As a mortise door knob hardware reliable export supplier, our factory supports distributors, door companies, renovation brands, hotel projects, and regional hardware programs.

Our OEM and ODM service can coordinate:

• Knob diameter and shape

• Spindle length

• Rose or backplate design

• Mortice case dimensions

• Passage, privacy, or keyed function

• Stainless steel material options

• Surface matching

• Screw and accessory sets

• Private labels

• Export cartons

Producing coordinated handles, knobs, locks, and related fittings helps reduce compatibility problems between separately sourced components.

Build a Complete Mortice Knob Collection

Provide the door thickness, backset, lock-case size, spindle center, required function, finish, order quantity, and destination market.

Our team can prepare a matching sample set and quotation covering knob design, lock compatibility, OEM changes, functional inspection, and protective export packaging.