Fixed Grab Bar Tube Diameter: Ø25mm, Ø27mm or Ø32mm Compared

Updated 2026-11-05 · RAYEN 雷茵

What tube diameters do fixed grab bars come in?

Grab bars are named by what the hand holds. Across our range, the figure runs from Ø25mm to Ø32mm for round tube, and to a 40mm section for the timber grip.

• Ø25mm: PRE310, a straight bar, 450mm overall, with centre distance P=425mm, Ø55mm roses and a 76mm projection. Polished stainless.
• Ø27mm: HB2918, a frame rail in Satin stainless. Its drawing shows raised grip sections along the tube.
• Ø27.2mm: OASHB301, a frame rail in Satin stainless or Matt black.
• Ø32mm: HB2102, a straight bar, and HB2118, a frame rail. Both in Satin stainless.
• 40mm grip section: HG2020, a timber grip on stainless brackets, 600mm overall, P=570mm, with a 64.5mm projection.

The table compares the models that share the Ø80mm rose.

The Ø80mm rose stays the same while the tube changes, so you can compare HB2118 and HB2918 on tube alone.

Does a bigger tube mean a better grab bar?

No. It means a different grip. A Ø32mm tube gives a large hand more to hold. A Ø25mm tube is easier for a small hand to close around, and it looks lighter in a home bathroom. Neither figure says how much the bar carries. That depends on the wall, the anchors and the fixing.

Grip also depends on surface. Polished stainless feels different from satin when wet. A raised grip section gives the fingers something to find. A timber grip feels warm to the touch, which some care settings prefer.

Hold a sample before you commit. Users with arthritis or weak hands will tell you more than a table can.

Do local rules set the diameter?

Often, yes. Accessibility rules differ by country and by building type, and they can set the diameter, the clearance from the wall, the height and the length. Check the rules that apply to your project and read them against our drawing. We give you the drawing; your architect or authority confirms the rest.

Why does the projection matter?

Tube diameter is what the hand holds. Projection is how far the bar stands from the wall, and it decides whether the hand fits behind it. HB2102 has a 100mm projection. PRE310 has 76mm. HG2020 has 64.5mm. The figure is measured to the outside of the bar, so take off the tube to get the clear gap. Read each one on the drawing before you compare them.

A deeper bar also puts more leverage on the wall fixing. Plan the backing with that in mind.

How do I measure an existing bar?

If you are replacing a bar, use calipers on the plain part of the tube. A tape across a curve reads wrong. On a bar with raised sections, measure between them. Then measure:

• The distance between the fixing centres, which is the P value on our drawings.
• The rose diameter, and the screw positions in it.
• The distance from the wall to the outside of the bar.
• The overall length.

A worked example: a clinic replaces a straight bar with 600mm between its rose centres with a Ø32mm tube and an Ø80mm rose. HB2102 matches all three figures: 600mm between rose centres, Ø32mm tube and Ø80mm rose, with a 13mm rose thickness and a 100mm projection. Check the old screw positions against the rose drawing before you reuse the holes. If they do not match, plan to fill them and drill again, with the fixing into solid wall.

What must the wall be?

Fix to solid masonry or to backing built into the wall for this purpose. Do not fix a grab bar to glass, a shower screen, a door or a hollow partition. Choose anchors for your wall type, and have the installer confirm them.

What to write on the order

Give the model, the tube, the length, the finish and the wall type. For example: Grab Bar, HB2102, stainless steel, Satin stainless, rose centres P=600mm, tube Ø32mm, rose Ø80mm. Quantities, price and delivery are confirmed per order. See the bathroom range, or tell us the tube size you need and we will send the drawing.