Chrome Door Knobs Guide: Mortice, Rim, Centre and Front Door Knobs Explained
Chrome door knobs can completely change the look of a door, but the right choice depends on more than the finish. A mortice knob, rim knob and centre door knob may all look similar at first glance, yet they are designed for very different jobs. Some turn and operate a latch, some work with a lock, and some are fixed pulls for front doors.
This guide explains the main types of chrome door knobs, where each one is used, what to measure before ordering, and how to avoid buying a knob that looks right but does not suit your door. It is written for buyers replacing old knobs, renovating internal doors, restoring period doors or matching a front door with other polished chrome door furniture.
Choose the knob by the door mechanism first
The quickest way to choose the right chrome door knob is to look at how the door currently opens, closes or locks. The table below gives a simple starting point.
| Door setup | Usually choose | Important note |
|---|---|---|
| Internal door with a latch fitted inside the door edge | Mortice door knobs | Used with a tubular latch where the door does not need to lock. |
| Internal door with a lock fitted into the door edge | Mortice door knobs with escutcheons | Used with a mortice sashlock or deadlock, depending on the door. |
| Traditional door with a box-style lock fitted on the face of the door | Rim door knobs | Rim knobs are designed to work with surface-mounted rim locks or latches. |
| Front door where the knob is used only to pull the door closed | Centre door knob or front door knob | Usually fixed in place and does not turn or operate a latch. |
| Cupboard, wardrobe or drawer | Cabinet knob, not a door knob | Cabinet knobs are smaller and usually fixed with a machine screw. |
If the door needs to open by turning the knob, look at mortice or rim knobs. If the knob is only there to pull a front door closed, look at centre door knobs. If you are choosing for cupboards or wardrobes, you are probably looking for cabinet knobs rather than door knobs.
To compare the available finish-led options, browse our polished chrome door knobs once you know which mechanism your door uses.
Mortice chrome door knobs: best for most internal doors
Mortice door knobs are the most common type of knob for internal doors. They are designed to work with a latch or lock fitted into the edge of the door. From the outside, you normally see a pair of knobs mounted on roses, with a spindle passing through the door to connect both sides.
Choose mortice knobs when the door already has, or will be fitted with, one of the following:
- a tubular latch for a non-locking internal door;
- a bathroom lock with a separate turn and release;
- a mortice sashlock with separate keyhole escutcheons;
- a mortice deadlock where the knob is used only with a separate locking point.
Good to know
Mortice knobs often need more space between the knob and the door frame than lever handles do. If the latch is too short, your hand can catch the frame when turning the knob. For many installations, a 3in latch gives more comfortable clearance than a shorter latch, but always check the product and door setup before ordering.
Sprung vs unsprung mortice knobs
Some mortice knobs are sprung, meaning the knob has spring assistance built into the mechanism. Others are unsprung and rely on the latch or lock to return the knob after it has been turned. This is an important detail because a heavy or unsprung knob may need a stronger latch to work smoothly.
If you choose an unsprung chrome door knob, check whether the product recommends a heavy-duty latch. If you are replacing an existing knob that feels loose, slow to return or difficult to turn, the latch may be as much of the problem as the knob itself.
When mortice knobs are the right choice
- You want a traditional or softer look than a lever handle.
- The door uses a latch or lock fitted into the edge.
- You are fitting knobs to bedrooms, living rooms, studies, hallways or dining rooms.
- You want matching escutcheons or bathroom turns in the same chrome finish.
- You have enough backset clearance for comfortable hand movement.
Rim chrome door knobs: best for surface-mounted rim locks
Rim door knobs are different from mortice knobs because they work with a rim lock or rim latch fitted to the face of the door, not into the door edge. This setup is common on older internal doors, cottage-style doors and period properties where the lock case is visible on one side.
A rim knob set is usually not symmetrical. One knob has a rose and fixes to the side of the door opposite the rim lock. The other knob fits close to the rim lock body and may not have a rose because the lock case itself provides the surface around the spindle.
How to tell if you need rim knobs
You probably need rim door knobs if the lock is a visible metal box fixed to the face of the door. This is different from a mortice lock, which is mostly hidden inside the edge of the door.
Before ordering chrome rim knobs, check:
- whether the door has a rim lock or rim latch;
- which side of the door the lock is fitted to;
- whether you need a full rim lock and knob set or knobs only;
- whether the spindle suits the lock case;
- whether the finish should match the rim lock, escutcheon and keep.
When rim knobs are the right choice
- You are restoring or replacing hardware on an older internal door.
- The door has a surface-mounted rim lock or latch.
- You want a period-style look but prefer a bright chrome finish.
- You need the knobs to work with a visible lock case rather than a hidden latch.
Centre door knobs and front door knobs: fixed pulls for entrance doors
Centre door knobs, also called front door knobs, are usually fitted to the outside face of a front door. Their job is to help pull the door closed and add a decorative focal point. Unlike mortice or rim knobs, a centre door knob is normally fixed in place and does not turn.
This distinction is important. A centre knob may look like a large door knob, but it is not designed to operate a latch. If you need a knob that turns and opens an internal door, you need a mortice or rim knob instead.
Where should a centre door knob be fitted?
Traditionally, a centre knob is fitted near the centre line of a front door. The exact position depends on the door design, panels, glazing, letterbox, door knocker and locking hardware. On panelled doors, the knob usually looks best when it sits naturally within the door’s proportions rather than being squeezed too close to other fittings.
Before drilling, check the door from both sides. Many centre knobs are fixed with a bolt that passes through the door, so the inside fixing point or dome nut may be visible on the internal face. Make sure the fixing will not clash with locks, glazing, decorative mouldings or internal hardware.
When centre door knobs are the right choice
- You want to dress a front door rather than operate an internal latch.
- The door already has a separate nightlatch, deadlock, multipoint lock or pull handle arrangement.
- You want a traditional, premium or symmetrical front door look.
- You are matching the knob with a chrome letterbox, door knocker, numbers or bell push.
Planning chrome front door knobs with the rest of the entrance
A chrome front door knob should be chosen as part of the whole entrance, not as a standalone item. It will usually sit near other visible pieces of hardware, so scale, spacing and finish are all important.
On a front door, consider the relationship between the knob and:
- letterbox or letter plate;
- door knocker;
- door numbers or letters;
- bell push;
- cylinder pull or escutcheon;
- nightlatch, deadlock or multipoint lock hardware;
- pull handles or other entrance furniture.
If your door already has polished chrome hardware, matching the finish is usually the safest option. If you are replacing several pieces at once, browse the wider polished chrome collection so the centre knob, letterbox, knocker, numbers and other fittings work together.
Mortice vs rim vs centre door knobs: the practical differences
The easiest way to avoid confusion is to compare the three types by what they actually do.
| Type | Turns? | Operates a latch? | Typical use | Usually supplied as |
|---|---|---|---|---|
| Mortice door knob | Yes | Yes, when used with a suitable latch or lock | Internal doors with hardware fitted into the door edge | Pair of knobs with spindle and fixings |
| Rim door knob | Yes | Yes, when used with a rim lock or rim latch | Traditional doors with a surface-mounted lock case | Pair of knobs, often with one rose only |
| Centre door knob | No, usually fixed | No | Front doors as a pull or decorative feature | Single knob with fixing bolt |
What to measure before buying chrome door knobs
Measuring matters more with door knobs than many buyers expect. A knob needs enough room to turn, needs to line up with the latch or lock, and needs to cover any marks left by the previous fitting.
For mortice knobs
- Backset: the distance from the door edge to the centre of the spindle hole. This affects hand clearance.
- Rose diameter: helps confirm whether the new knob will cover old screw holes or marks.
- Door thickness: needed to make sure the spindle and fixings are suitable.
- Latch or lock type: check whether the door uses a tubular latch, bathroom lock or mortice sashlock.
- Projection: useful for doors close to walls, shutters, cupboards or other obstructions.
For rim knobs
- Rim lock position: check where the surface-mounted lock sits on the door.
- Spindle size and position: the knobs need to work with the rim lock case.
- Door thickness: affects spindle length and fixing suitability.
- Lock side: note which face of the door has the rim lock fitted.
- Rose size: the visible rose is usually fitted to the opposite side of the door from the rim lock.
For centre door knobs
- Knob diameter: affects how bold the front door will look.
- Projection: how far the knob stands out from the door.
- Base or rose diameter: important for visual balance and covering old marks.
- Door thickness: needed because many centre knobs are bolt fixed through the door.
- Internal fixing position: check what will be visible on the inside face of the door.
What else might you need with chrome door knobs?
Door knobs are often only one part of the setup. Depending on the door, you may also need a latch, lock, escutcheon, turn and release or matching front door furniture.
| Knob type | Often needed with it | Why |
|---|---|---|
| Mortice knob on a non-locking internal door | Tubular latch | The latch lets the door stay closed and return properly when the knob is turned. |
| Mortice knob on a locking internal door | Mortice sashlock and escutcheons | The sashlock provides the latch and key locking; escutcheons finish the keyhole. |
| Mortice knob on a bathroom door | Bathroom lock, turn and release | The knob opens the latch while the turn provides privacy. |
| Rim knob | Rim lock or rim latch | The knobs are designed to work with a surface-mounted lock or latch case. |
| Centre door knob | Front door lock, letterbox, knocker, numbers or cylinder pull | The centre knob is a pull, so the door still needs separate locking and entrance hardware. |
Choosing the right chrome door knob style
Once you know the correct type, you can choose the style. Polished chrome has a bright, reflective look, so the shape of the knob has a big effect on whether the door feels traditional, contemporary or somewhere between the two.
Round and mushroom knobs
Round and mushroom-shaped chrome knobs are versatile. They suit internal doors where you want a simple, familiar shape that does not overpower the room.
Reeded and beehive-style knobs
Reeded knobs add grip and decorative texture. They work particularly well on period doors, painted timber doors and interiors where the hardware is meant to be noticed.
Octagonal and Art Deco-inspired knobs
Octagonal or geometric chrome knobs can give a stronger design-led finish. They are useful where you want the brightness of chrome but a more architectural or Art Deco feel.
Large centre knobs
Larger centre knobs are best treated as front door furniture. They should be chosen in proportion to the door size, panel layout and nearby hardware rather than simply matching the smallest internal knobs in the property.
Useful chrome door knob examples
These examples show how different chrome door knob types are used in different situations. Always compare the product details with your door, latch or lock before ordering.
- Georgian Polished Chrome Mortice Door Knobs — a sprung mortice knob set for internal doors, typically used with a tubular latch.
- Polished Chrome Octagonal Mortice Door Knobs — an unsprung mortice knob set with a more distinctive geometric shape.
- Polished Chrome Reeded Rim Door Knob Set 55mm — a rim knob set for doors with a surface-mounted rim lock.
- Polished Chrome Rim Lock and Reeded Rim Knob Set — useful when both the rim lock and matching knobs are being replaced together.
- Jedo Polished Chrome Centre Door Knob 2.5in — a fixed front door pull with a tiered rim.
- Sloane Polished Chrome Centre Door Knob 102mm — a larger centre knob for a stronger front door statement.
- Heritage RR906 Polished Chrome Reeded Centre Door Knob — a decorative fixed pull for front doors with matching reeded detailing.
Common mistakes when buying chrome door knobs
Buying a centre knob for a door that needs to open
Centre door knobs are usually fixed pulls. They do not turn and they do not operate a latch. For an internal door that needs to open by turning the knob, choose a mortice or rim knob instead.
Choosing mortice knobs for a rim lock
Mortice and rim knobs are not fitted in the same way. If the lock is mounted on the face of the door, you need rim furniture rather than ordinary mortice knobs.
Using too short a latch with mortice knobs
Door knobs need enough distance from the door edge so your hand can turn the knob comfortably. A latch that places the knob too close to the frame can make the door awkward to use.
Ignoring sprung and unsprung details
Unsprung knobs may need a stronger latch to return properly. If the knob feels heavy or does not spring back, the latch may not be suitable.
Forgetting escutcheons or bathroom turns
If the door needs to lock, the knob set alone may not be enough. You may also need keyhole escutcheons, a bathroom turn and release, or a suitable lock case.
Matching the knob but not the surrounding hardware
A polished chrome knob will look more deliberate when the latch faceplate, hinges, escutcheons, bathroom turns and front door furniture are also coordinated.
Chrome door knob buying checklist
- Check whether the door uses a mortice latch, mortice lock, rim lock or no turning mechanism at all.
- Choose mortice knobs for internal doors with hardware fitted into the edge of the door.
- Choose rim knobs for doors with a surface-mounted rim lock or rim latch.
- Choose a centre door knob for a fixed front door pull, not for operating a latch.
- Measure the backset, rose size, projection and door thickness before ordering.
- Check whether the knobs are sprung or unsprung.
- Confirm whether a latch, lock, escutcheon, bathroom turn or fixing bolt is included or sold separately.
- Make sure the chrome finish matches nearby hinges, locks, latches and other door furniture.
- For front doors, plan the centre knob with the letterbox, knocker, numbers and locking hardware.
- Read the individual product details carefully before fitting or drilling new holes.
Chrome door knob FAQs
What is the difference between mortice door knobs and rim door knobs?
Mortice door knobs are used with a latch or lock fitted into the edge of the door. Rim door knobs are used with a rim lock or rim latch fitted to the surface of the door. The two types are fitted differently, so it is important to match the knob to the lock type.
Can I use a centre door knob to open a door?
Usually, no. A centre door knob is normally a fixed pull for a front door. It does not turn and does not operate a latch. If you need the knob to open an internal door, choose a mortice or rim door knob instead.
Are chrome mortice door knobs sold in pairs?
Most mortice door knobs are supplied as a pair, with one knob for each side of the door, plus a connecting spindle and fixings. Always check the individual product details before ordering.
Do chrome door knobs need a special latch?
Some door knobs work best with a longer or stronger latch, especially if they are unsprung or heavier than a standard lever handle. Check the product details and make sure the latch gives enough clearance from the door frame.
Can chrome door knobs be used on bathroom doors?
Yes, mortice door knobs can be used on bathroom doors, but you will usually need a bathroom lock plus a separate turn and release. The knob operates the latch, while the turn provides privacy.
What is a rim lock door knob?
A rim lock door knob is designed for use with a rim lock or rim latch fixed to the surface of the door. One knob often has a rose, while the other sits close to the lock body.
Where should a front door centre knob be positioned?
A centre knob is usually fitted on the outside face of a front door, often near the centre line of the door. The best position depends on the door panels, letterbox, knocker, lock position and overall balance of the entrance hardware.
Should chrome door knobs match the hinges and latches?
Matching the visible hardware usually gives the cleanest finish. Polished chrome knobs often look best with chrome hinges, latch faceplates, escutcheons, bathroom turns, letterboxes and other nearby fittings.