Wardrobe hanging rails: metal, section, span and load

At a glance

Span to a mid-span deflection of span/200, rail weight included: our arithmetic. Section sizes are illustrations.

Start with the load

A rail carries garments on hangers, spread along its length, so its load is stated per metre. We found no standard or published average that gives a typical garment load for a wardrobe, so this sheet does not claim one. What the sources do give is test levels. An Italian furniture test house's one-page comparison table of tests on furniture (March 2024) lists the clothes-rail support test at 4 kg per decimetre, which is 40 kg a metre, for domestic storage units in EN 16122 clause 6.3.1 and ISO 7170, 5 kg per decimetre in ISO 7170's non-domestic column, and a rail-dislodgement test at 5 kg per decimetre. The same table shows no clothes-rail entry in the EN 14749 safety-requirements column. We have not read the standards, and the table does not say how the loads are applied or what counts as a pass.

We therefore run two cases: 40 kg per metre, the test level, and 20 kg per metre, half of it, which is our illustration and not a typical load. The right figure for a project comes from the client's garment list: weigh a loaded hanger, count how many hang in a metre, and give the partner the result. Hotels and shared dressing rooms will be heavier use. For rail heights, hanging depth and the space each garment takes, see the wardrobe and dressing room dimensions sheet.

What sags: the arithmetic

Treat the rail as a beam carrying an even load w along its length, its ends resting in sockets. The load w is the garments plus the rail's own weight. E is the material's stiffness and I is the section's second moment of area (values are given with the sections further down).

• Supported at the two ends only: deflection at mid-span = 5 w L⁴ / (384 E I); bending moment = w L² / 8.
• One rigid centre support: each half is a span of L / 2; largest deflection = 0.005416 w (L / 2)⁴ / (E I); the centre support takes 1.25 w (L / 2) and each end 0.375 w (L / 2); the bending moment over the centre support = w (L / 2)² / 8.

We checked the coefficients by an independent numerical solve of the beam equations (5.208 mm against 5.208 mm for a test beam; 0.0054157; reactions 0.375, 1.25 and 0.375). The limit we use is span/200, the 0.5 per cent maximum shelf deflection in the shelf test (EN 16122 clause 6.1.4) as the test house's table lists it. We found no deflection limit for a clothes rail, so this is a starting point. The shelving sheet uses span/144, a US woodwork figure, for shelves: at span/144 the spans below are about 12 per cent longer.

The tables give two numbers in each cell: the longest span between two supports, then the longest total length with one rigid centre support. Both are rounded down to 10 mm.

40 kg per metre (the test level)

20 kg per metre (our illustration)

At the spans in these tables the bending stress is at most 0.6 of the minimum proof strength used, so deflection decides the span. That changes with thinner walls or longer spans: the worked example shows it.

Worked example: an 1,800 mm bay

With the ends alone, this rail would sag far past the limit and, at 40 kg a metre, take a bending stress above the proof strength we used for the softest brass temper. One rigid centre support cuts the deflection to a small fraction. The word rigid matters: a bracket fixed to the underside of a shelf moves when the shelf bends under its load, and the arithmetic above assumes it does not. See the shelving sheet for the shelf.

Metals, sections and finishes

The values behind every number above are these. They come from the documents named, for the product forms named, and none is a tube value from the partner's own supplier.

Section. Stiffness rises quickly with diameter. Going from a 19 to a 25 mm round tube at the same 1.5 mm wall raises I from 3,180 to 7,676 mm⁴, and from 25 to 32 mm raises it to 16,753 mm⁴. An oval 30 x 15 tube with its long side upright has I = 8,286 mm⁴, close to a 25 mm round, but turned long side across it falls to 2,680 mm⁴, about 3 times less stiff, and its span in brass drops from 950 to 650 mm at 40 kg a metre. Solid bars are stiff and heavy:

Timber. A solid oak rail is stiff only because it is thick, and timber continues to deflect under a steady load, so we hold the initial deflection to the limit divided by 1.5, the long-term factor the shelving sheet uses. The oak values are for US white oak at 12 per cent moisture; a European species will differ.

Finishes. The finish decides how the rail looks after a year of hands and hangers.

• Lacquered or living brass. The conservation guidance we use says lacquer always alters the look, is hard to apply thin and even, and is hard to remove, and our lacquer sheet finds no independent durability data. A rail left unsealed keeps changing: tell the client in writing.
• Plated steel. The layer is thin, so it can wear through where hanger hooks rub and the metal beneath shows: see plating and coating thickness.
• PVD on stainless. It follows the texture beneath, and Euro Inox says damage cannot be repaired: see PVD coatings.
• Anodised aluminium. The anodic film is part of the metal's surface (NAAMM/NOMMA). Sheet and extrusion are always likely to differ in colour, so approve the rail and its brackets together.
• Matching the hardware. Give the rail, sockets, centre supports, handles and hinges one finish name and one signed sample. Hardware makers' finish codes disagree: see ironmongery finish codes and sample approval and batch variation. Retail centre brackets are listed in die-cast zinc, plated mild steel and stainless steel, so a solid brass tube can meet a bracket in another metal and finish: ask for sockets and brackets in the same metal and finish as the tube.

Supports, sockets and fixings

• The end sockets hold the tube at each end and let it rotate; the arithmetic treats the ends as simply supported. How the socket holds the tube without rattling is a question for the partner: no source we read gives a method.
• The centre support takes 1.25 times the line load times the span on one side. In the worked example that is about 452 N at 40 kg per metre, so its fixing needs a panel that will hold it, and the panel itself must not bend away.
• The fixings into the carcass carry the end reactions, 0.375 w (L / 2) each, and the centre support. Specify the fixing and the board it goes into, not just the bracket.
• Clearance to the shelf lets hangers be lifted on and off. Our dimensions sheet gives a convention of about 100 to 150 mm to the shelf above, which is a convention and not a standard.
• Walk-in runs are long: a rail on two supports for 2,400 mm needs a different answer from a 900 mm bay. Plan centre supports at the set-out stage, not at fitting.

Six checks before the rail is drawn

• Load. The client's garment list, turned into kilograms a metre, and whether use is domestic or heavy.
• Material and section. Tube or bar, wall thickness, alloy and temper, from the partner's supplier, with the partner's own E and proof strength.
• Span and supports. The longest unsupported length, where centre supports go, and what each hangs from.
• Deflection limit. Stated on the drawing as span/[ ], not left to the fitter.
• Sockets, supports and fixings. Material, finish, capacity and the board they fix into.
• Finish and sample. One finish for rail, sockets and hardware, approved on a signed sample with a worn hanger contact in mind.

Hanging rail: [25 mm round tube, 1.5 mm wall, solid brass CW508L / 304 stainless steel / other], finish [code and sample reference], supported at both ends in sockets of matching metal and finish and by centre supports of matching metal and finish at not more than [900] mm centres. Design load [20 / 40] kg per metre of rail, rail weight included; maximum deflection at mid-span of any span [span/200]. The workshop to confirm the section, the span and the support spacing by calculation or load test and supply the calculation or report before production.

Rail sockets and centre supports fixed to [18 mm board / solid timber / wall plate] with [fixings] to resist not less than [ ] N each, the centre support being designed for 1.25 x the design line load x the span on one side. The part the centre support hangs from not to deflect more than [ ] mm under that load.

Rail, sockets, centre supports, handles and hinges to be one finish: [name, code], approved on a signed sample [reference, date] showing the rail, one socket and one bracket. The sample governs.

Standards and sources

• BS EN 16122, ISO 7170 and BS EN 14749: clothes-rail clauses 6.3.1, 6.3.2 and shelf limit 6.1.4 as listed in a test house's table (March 2024); EN 16122:2012 shown Current by third-party shops. Texts not read: confirm the current edition.
• Euro Inox, Stainless Steel: Tables of Technical Properties (2nd ed. 2007): read 5 Nov 2026.
• steelconstruction.info: Steel material properties: read 5 Nov 2026.
• USDA Forest Products Laboratory, Wood Handbook FPL-GTR-282 (2021): Table 5-3a, metric.
• A CW508L tubes data sheet (16 Jan 2025) and an EN AW-6060 data sheet (Rev. 4, March 2023): named in the notes file.

Questions we are asked

How far can a wardrobe rail span without a centre support?

In our arithmetic, a 25 x 1.5 mm round tube carrying 40 kg a metre stays within span/200 over about 930 mm in brass, 1,130 mm in stainless steel, 1,150 mm in steel and 800 mm in aluminium. At 20 kg a metre the spans are longer. These are starting points: the partner workshop confirms them for its own tube and sockets.

What size tube should a wardrobe rail be?

25 mm round is the size our figures use as the middle case, with 19 mm lighter and 32 mm stiffer: raising the diameter from 25 to 32 mm at the same wall raises the stiffness from 7,676 to 16,753 mm to the fourth. An oval 30 x 15 tube is as stiff as a 25 mm round only when its long side is upright. The partner states the sizes it actually uses.

Does a centre support really matter?

Yes, if it is rigid. For the 1,800 mm brass example, the deflection falls from 65 mm to 1.7 mm at 40 kg a metre. But a bracket fixed to a shelf that bends moves with it, and the arithmetic assumes it does not.

How much weight can a wardrobe rail hold?

No standard we read states a typical wardrobe load. A test house's table lists a clothes-rail support test at 4 kg per 100 mm (40 kg a metre) for domestic storage units, which is a test level and not a design load. The load for your project comes from the client's garment list, and the partner confirms the rail for it.

Brass or stainless steel for a hanging rail?

Stainless steel is stiffer, so it spans further at the same section, and brass can be polished, lacquered or left to age. Brass lacquer wears where hands land, and a living brass finish keeps changing. PVD on stainless cannot be repaired on site. Choose by finish and care as much as by span.

Why does a plated rail show a different metal at the hanger?

Plating is a thin layer, so hanger hooks can wear through it where they slide, and the metal beneath shows. This is polish-through. Solid brass or stainless has no layer to wear through, but a lacquer on brass can wear in the same places.