The historic Melbourne custom-cut page warned that maximum sheet size depends on thickness, grade and finish. That sentence is still the whole logistics problem. You cannot assume a 1500-wide No. 4 316 exists in 3 mm just because 304 2B does.
Australian trade thinks in millimetres. Imported literature still thinks in 4 × 8 feet. Write millimetres on the drawing. This journal does not sell sheet and it does not keep a live size list. Merchant ranges move. The blanks below are the ones Australian counters still think in.
If you are taking a parent down to a part, read custom-cut stainless in Australia next. If you are still choosing a face, start with finishes explained.
The blanks you will actually meet
Australian merchants typically stock stainless sheet in a short list of metric parents. The everyday kitchen and fabrication blank is 2400 × 1200 mm. Longer work looks for 3000 × 1500 mm. Some grades, finishes and thinner gauges stretch to 3600 × 1500 mm. Coil-origin sheet can be other widths. Plate is a different product.
| Parent sheet (mm) | Typical role | What usually lives here | What often does not |
|---|---|---|---|
| 2400 × 1200 | Everyday blank | 304 2B and No. 4 in kitchen thicknesses | Heroic polished 316 in heavy gauge |
| 3000 × 1500 | Longer splashbacks, bigger trays | Many 304 sheets; some 316 | Every finish in every thickness |
| 3600 × 1500 | Long runs, when stocked | Selected thinner sheets and mill finishes | Assume nothing — confirm the rack |
| ~2438 × 1219 (4 × 8 ft) | Imported leftover module | Some imported coil and older stock | A clean match to a 1200 kitchen grid |
| Half sheet | Nesting strategy | A cut from a parent, not a mill size | Automatic offcuts you did not ask for |
The old catalogue sold a half-sheet cut, then custom pieces from that. Offcuts were not automatic. They still are not.
If you need a thickness above a few millimetres, you may have already left the kitchen rack and entered plate. Plate widths and lengths are their own lists. Do not draw a 5 mm “sheet” at 3600 × 1500 because a 1.2 mm No. 4 did that last year.
Why the maximum moves
Thicker sheet is heavier and sometimes narrower. A 3 mm parent that a two-person crew can still flip is not the same product as a 1.2 mm splashback sheet. Polished and filmed sheet is babied and may not exist in the heroic size. 316 is stocked narrower than 304 in some finishes.
Finish is a size constraint. Mill 2B is the easiest face to find in a large parent. No. 4 is common in kitchen sizes and less automatic in 3600 mm. BA and No. 8 are cosmetic products: fewer thicknesses, fewer widths, more film, more handling cost. HRAP belongs on heavy sections, not on a kitchen parent.
A merchant’s website list beats a memory of a job in 2019. This journal will not invent a stock table and pretend it is current. Confirm grade, finish and millimetre thickness together.
Weight, trucks and folders
A 2400 × 1200 × 1.2 mm 304 sheet is a two-person carry with respect. The same footprint in 3 mm is a lifting problem. A 3600 × 1500 sheet is a truck and a door problem before it is a fabrication problem. The shear has a throat. The folder has a length. A 3600 mm tray that cannot enter the folder is a drawing, not a product.
Custom-cut stainless is how you take a parent sheet down to a blank. The historic Melbourne shop published a ±2 mm cut tolerance and warned that a sheared edge is not an extrusion. That number still belongs on the drawing if the blank has to fit a carcass or a stone top.
Laser and waterjet can work from the same parents and, if you paid for them, hold a tighter window and a cleaner edge. They do not invent a size the mill did not roll.
Feet, millimetres and the joint you will see
Imported 4 × 8 foot sheets convert to about 1219 × 2438 mm. That is not 1200 × 2400. A kitchen set out on a 600 mm module will notice the extra 19 mm, or the missing 19 mm, when the last panel is 20 mm short and someone reaches for a grinder.
Do not mix a 1200 module with a 4-foot module and hope the splashback lines up. Write millimetres. If the merchant only has imperial parents, convert on the cut list and nest again.
A 4000 mm seamless elevation is a wish until the mill, the finish, the thickness and the truck agree. Two sheets and a joint — a trim, a cover strip, a change of plane — is often the honest detail. Grain on No. 4 should run the same way across that joint. Brushed versus polished is the page for why a mismatched grain looks like a repair.
Planning a cut list
Nest pieces on the parent sheet before you fall in love with a seamless elevation. A 2400 × 1200 sheet does not contain four 1300 mm lengths. It will contain a surprising number of 1180 mm widths if you stop being optimistic.
Allow for the shear edge. The old site was honest that a cut edge is not an extrusion. ±2 mm is a real tolerance; read it again on the custom-cut essay. If the blank is a tray, the developed width must fit the parent after you add the folds. That is year-10 metalwork and the step most kitchen drawings skip.
Protective film is part of the size conversation because filmed sheet is what you want on a truck. Protecting stainless during install covers when to peel it. Sun-struck film on a 3600 mm west-facing run is a different problem from film on a cupboard blank.
Developed widths for folds
If the part is a folded angle or channel, the developed width must fit the parent sheet. A 1500-wide parent does not give you a 1600 mm developed channel. Internal versus external dimensions matter because the radius eats metal. The old folder’s smallest-leg notes get stricter as thickness climbs.
Write grain before the nest. A No. 4 channel with grain along the length will not match an adjacent angle cut across the parent.
Site cuts versus shop parents
A balcony is a poor place to discover that the sheet is 20 mm short. If you are trimming on site, you are already in cutting stainless sheet on site territory: swarf, heat, and a tolerance that is worse than the shop’s ±2 mm.
Guillotine in the shop is how most Australian blanks still start. Laser and waterjet are the upgrade when the nest is intricate or the edge is seen. An angle grinder on a 316 splashback is how the next bay’s rail grows brown specks.
If the quote is really about which metal belongs in the opening, step back to stainless versus galvanised versus aluminium. Size is a logistics problem. Alloy is a duty problem. Do not solve one with the other.
The sheet, plate and finishes hub holds the mill-floor map. The custom-cut and sections hub is where blanks become angles, channels and trays.