Bathroom Hardware Sizes: Towel Bars, Racks, Roll Holders and Recessed Units

Updated 2026-11-05 · RAYEN 雷茵

How do you read a bathroom hardware drawing?

Four figures matter on almost every piece, and they answer different questions.

• Overall length: how much wall the piece covers.
• Centre distance, written P on our drawings: how far apart the fixings sit. This is what you mark on the wall.
• Projection or depth: how far the piece stands from the wall. It decides whether a door or a shoulder hits it.
• Rose diameter: the round base on the wall. It decides whether the fixing lands on one tile or across a joint.

The table shows three models with a published centre distance.

PRE310 is a grab bar rather than a towel bar. Read its drawing with the grab bar tube guide, and never use a towel bar as a grab bar. A towel bar carries towels. It is not built or fixed to carry a person.

What size is a towel bar and a towel rack?

PRE_G400 is a towel bar: 500mm overall, P=450mm, 81.5mm projection, on 50 × 30mm roses. It comes in Satin stainless or Antique brass.

PRE330 is a towel rack with a shelf of bars: 595mm overall, P=550mm, 204mm deep, Ø45mm roses and Ø20mm tube, in Polished stainless. The depth is the figure to check. At 204mm it is a shelf, and it needs clear space in front of it, above a shower or a bath.

A worked example: you want a towel bar with both fixings clear of the tile joints. PRE_G400 fixes at 450mm centres, so lay that figure over your tile plan before anyone drills. Mark the 450mm on the wall, not the 500mm. Marking the overall length puts both holes in the wrong place, and tile does not forgive a second attempt.

What size is a toilet roll holder?

PRE361 is an upright holder: height 152mm, projection 83mm, tube Ø22mm, rose Ø45mm, with fixing centres of P=26mm. Polished stainless. A small rose means fixings sit close together. Check that the screws land on sound tile with backing behind, because a roll holder gets pulled every day.

What does a recessed unit need?

A recessed unit goes into the wall, so the wall has to be planned for it. OASSNB03 is a floor-level recessed tissue unit in Satin stainless.

• Face plate: 345 × 657mm.
• Wall cutout: 326mm × 638mm.
• Minimum wall depth: 180mm.

The face plate covers the cutout edge, so the cutout need not be perfect. It does need to be square. Read the wall depth with the tile and the backing included. If the wall has a pipe or a stud where the unit goes, the build has to change before the tile goes on. This is the one piece on the list to settle at drawing stage, not on site.

How are coat hooks sized?

Our coat hooks CH001, CH002, CH003, CH004 and CH006 are all stainless steel. CH001 and CH002 are single hooks on a round wall plate. The other three are hook rails. Their sizes come with the drawing, so ask us before you plan the wall.

What should you check on the wall?

• The tile layout, so fixings land where you want them.
• What sits behind the wall: pipes, cables, studs.
• The door swing, against every projection and depth.
• The wall type. Hollow walls need the right anchor, and only a solid wall or built-in backing takes a grab bar.
• One finish across the room. Each model lists its own finishes, so check them before you build a set.

Our range holds 25 models, including grab bars. If you need a set in one finish, send us the list and we will mark which models are available in it.

What to write on the order

Give the model, the piece, the finish and the size. For example: Towel Bar, PRE_G400, stainless steel, Satin stainless, overall length 500mm, P=450mm. For a recessed unit, add the wall type and depth. Quantities, price and delivery are confirmed per order. See the bathroom range, or send us the room list.