10mm Aluminum Plate: Weight, Tolerance, Alloy Choice, Machining

10mm aluminum plate is thick plate in the full sense. Fabrication shops use it for machine bases, fixture tables, flanges, load-bearing gussets, welding jigs and CNC-milled parts with deep pockets. Buying it is very different from buying thin sheet: a standard plate weighs about 80 kg, it is often hot-rolled and therefore follows a different tolerance table, and not every alloy can be bent. This guide helps you calculate weight, read tolerances, choose the alloy and plan the machining of 10mm aluminum plate.

Key figures to remember when buying 10mm aluminum plate (compiled by H&D Steel)

How much does 10mm aluminum plate weigh?

Plate weight equals density times volume. According to datasheets from the distributors Aalco and Dinco, the density of 1050A is about 2.71 g/cm³, 3003 about 2.73 g/cm³ and 5052 about 2.68 g/cm³. For a plate exactly 10 mm thick:

Quick rule: each millimetre of aluminum weighs about 2.7 kg per square metre, so 10 mm plate is about 27 kg/m², twice the weight of 5 mm. A 1,220 × 2,440 mm plate weighs about 80 kg and needs a forklift or hoist for handling and enough support points in transport. These are theoretical weights at exactly 10.00 mm; real plates vary within the tolerances below.

Hot-rolled or cold-rolled: two different tolerance tables

Hot-rolled aluminum plate follows the European standard EN 485-3 and cold-rolled plate follows EN 485-4; American-standard material uses ASTM B209. 10 mm plate may be either hot-rolled or cold-rolled, so ask your supplier and check the standard stated on the mill certificate before inspecting. For cold-rolled material, 10 mm falls in the “over 8.0 up to 10.0 mm” row of EN 485-4; the Color Metal table and Aalco’s summary give the same values:

In this thickness range the cold-rolled table does not split alloy groups: 1050A, 3003 (group I) and 5052 (group II) share the same tolerance. The two sources only differ in how they name the third width band: Aalco shows a 1,500 mm column, Color Metal a band over 1,250 up to 1,600 mm; the tolerance values are identical. The hot-rolled column comes from Aalco only and has not been cross-checked against a second source, so treat it as a reference and rely on the standard stated on the certificate. A conforming 1,250 mm wide plate should therefore measure 9.67–10.33 mm if cold-rolled, and about 9.55–10.45 mm if hot-rolled. When measuring, ignore a 10 mm zone from the edges, as noted in EN 485-4. ASTM B209 has its own inch-based tolerance tables in the paid part of the standard, so this guide only cites its scope.

Flatness: what matters for machine bases

Aalco’s summary of the EN standards allows hot-rolled plate 6–200 mm thick a maximum flatness deviation of 5.0 mm over 2,500 mm length and 2.5 mm over 1,250 mm width. For a machine base or fixture table, 5 mm of bow over a long plate is enough to spoil a part if it is clamped straight onto the milling table. 10 mm plate is too stiff to straighten in the shop; the usual fix is to face-mill both sides, so allow machining stock when choosing the thickness. On delivery, check flatness with a straight edge and ask for plates to be stored flat on pallets, not stacked over sparse supports.

Choosing the alloy for 10mm aluminum plate: 1050, 3003 or 5052?

According to Dinco’s datasheet quoting EN 485-2, 5052-H32 in the over 6.0 to 12.5 mm range has a tensile strength of 210–260 MPa, a minimum proof stress of 130 MPa and a minimum elongation of 12%. These strength values match those Aalco lists for 5052-H32 sheet up to 6 mm, meaning the H32 temper keeps the same strength as the plate gets thicker.

Quick guide: at 10 mm most parts are load-bearing or will be machined, so 5052 is the most common choice. 1050 and 3003 at 10 mm are often supplied in H112 (as-rolled) or H14 temper; properties differ by temper and we did not have two sources to cross-check this range, so ask for a mill certificate stating the temper and mechanical properties of the actual lot. Details for each alloy are on the 1050 aluminum sheet, 3003 aluminum sheet and 5052 aluminum sheet pages.

10 mm aluminum plate is usually face-milled on both sides before finishing — AI-generated illustration

Machining 10mm aluminum plate: milling, cutting, bending and welding

• CNC milling: the main process for 10 mm plate. 5052 gives a better surface finish than 1050; 1050 is soft and tends to load the cutter, so use sharp tools and enough coolant. Deep pockets milled from one side can distort the part through residual stress, so rough both faces before finishing.
• Cutting: 10 mm plate can be cut with a circular saw, waterjet, plasma or high-power fiber laser. Plasma and laser leave a heat-affected edge; parts that need accurate dimensions should keep stock for edge milling.
• Bending: the 90° cold bend radius table per The Aluminum Association (reproduced by Cumberland Metals) has a 3/8 inch column, about 9.5 mm, close to 10 mm plate. At this thickness 3003-H14 needs an inside radius of 2t (about 20 mm), 5052-H32 needs 1.5t (about 15 mm) and 5052-H34 needs 2.5t (about 25 mm). The press brake must also have enough tonnage; many shops machine a groove or weld instead of bending.
• Welding: 10 mm plate needs bevelled edges and multi-pass welding for full penetration. Both 3003 and 5052 are weldable, but the heat-affected zone softens compared with the original temper, so load-bearing welds need a margin.

When to choose a different thickness

Parts that only need stiffness without pockets, such as floors, load-bearing panels or small gussets, are often fine in 5 mm plate, at half the weight; see our article 5mm aluminum sheet: weight, tolerance, alloy choice and fabrication or the 5mm aluminum sheet page. Conversely, if a part must be face-milled on both sides and still finish at 10 mm, order thicker plate to allow machining stock.

Common mistakes when buying 10mm aluminum plate

1. Not asking whether the plate is hot-rolled or cold-rolled. The two follow different tolerance tables; check against the wrong one and you cannot tell whether the plate conforms.
2. Not measuring or weighing. Use a micrometer at three or more points over 10 mm from the edges. A 1,250 × 2,500 mm 5052 plate weighs about 83.8 kg in theory; under about 80 kg on the scale means it is thinner than even the hot-rolled tolerance.
3. Quotes without alloy and temper. “10 mm aluminum” in 1050 and in 5052-H32 differ greatly in strength and price; 5052-H32 and 5052-H112 also differ in properties.
4. No machining allowance. A plate that is bowed within tolerance still has to be face-milled; ordering exactly 10 mm for a 10 mm finished part leaves no stock.
5. Not requesting a mill certificate. It should state the standard, temper, chemical composition and mechanical properties of the actual lot, especially for machine bases and load-bearing parts.

References

• Aalco – EN Standards for Rolled Aluminium: hot-rolled and cold-rolled thickness tolerances, flatness
• Color Metal – Cold-rolled thickness tolerances to EN 485-4
• Dinco – Aluminium alloy 5052 H32 datasheet
• Cumberland Metals – Minimum bend radii per The Aluminum Association
• ASTM B209/B209M-21a – Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate (scope)
• Aalco – 1050A H14 and 5052 H32 datasheets; Dinco – 3003 H14 datasheet (density)

If you need 10mm aluminum plate in 1050, 3003 or 5052, cut to size with a mill certificate, send a request via our aluminum sheet and coil quotation page or call hotline/Zalo 0904 678 236 (Sales Department) for advice on the right alloy and thickness for each job.