4x8 Aluminium Sheet: Sizes, Weights and Grade Selection

What exactly is a 4x8 sheet?

The 4x8 format comes from North American building practice, where plywood, drywall and metal panels are made to fit framing at 16 or 24 inch centres. Aluminium mills and service centres roll and shear to the same 48 × 96 inch size so that sheets drop straight into fabrication jigs, CNC routers and vehicle body designs built around it.

Outside North America many mills cut to 1220 × 2440 mm, which is within a millimetre of true 4x8, or to the European standard 1250 × 2500 mm, which is about 5 % larger. If your drawing, router bed or shipping crate is designed tightly around 48 × 96 inches, say so on the order: a 1250 × 2500 sheet will not fit a 4x8 rack, and nesting programs built for one size waste material on the other.

Larger formats follow the same logic: 4x10 (48 × 120 in), 4x12 (48 × 144 in), 5x10 (60 × 120 in) and 5x12 (60 × 144 in). They reduce seams on trailer sides and facades, but they are heavier to handle and cost more to ship in containers.

4x8 aluminium sheet weight by thickness

Weight is area × thickness × density. A 4x8 sheet is 4,608 in², so in 6061 (0.0975 lb/in³) each 0.001 in of thickness adds 0.449 lb. Alloys differ slightly: 5052 is about 1 % lighter than 6061 and 3003 about 1 % heavier. The table uses nominal thickness; real sheets fall within the thickness tolerance of ASTM B209, so treat figures as estimates for handling and freight.

For metric sheets of 1220 × 2440 mm the arithmetic is simpler: weight in kg = 2.977 × thickness in mm × density in g/cm³.

For any other size use the plate and sheet weight calculator.

Aluminium sheet gauge to inches and millimetres

In the US, aluminium sheet is often called out by gauge. Aluminium uses the Brown & Sharpe (American Wire Gauge) series, not the Manufacturers' Standard Gauge used for steel, so a 16 gauge aluminium sheet is thinner than 16 gauge steel. Avoid confusion by ordering in decimal inches or millimetres.

Which alloy and temper should a 4x8 sheet be?

Any wrought alloy can be cut to 4x8, but a handful cover almost all orders. Choose the alloy for what the part must do: bend, weld, resist the weather, carry load or take a decorative finish.

Popular 4x8 sheet products and finishes

When does a 4x8 sheet become plate?

Under ASTM B209 and the ANSI H35.2 dimensional standard, flat-rolled aluminium 0.006 to 0.249 in thick is sheet, and 0.250 in (6.35 mm) and over is plate. European practice under EN 485 uses 6 mm as the usual dividing line. The distinction is not just vocabulary: plate has its own tolerance tables, is often produced on different lines and is available in stress-relieved tempers such as 6061-T651.

A 4x8 sheet at 1/4 inch in 6061 weighs about 112 lb (51 kg), which is about the limit of comfortable two-person handling. Above that thickness, plate is often bought in larger formats and saw-cut to finished blanks rather than ordered as 4x8 sheets. Our 1/4 inch plate guide covers that thickness in detail.

Getting the most out of a 4x8 sheet

• Plan the nest first: a 4x8 sheet yields eight 24 × 24 in blanks or eighteen 16 × 16 in blanks only if the saw kerf (about 3 mm for a blade, under 1 mm for a laser) is allowed for. Design parts to 23.875 in rather than 24 in if you need exactly eight.
• Respect grain direction: bend across the rolling direction where possible. The grain runs along the 96 in length on a standard sheet.
• Use the right method: shears for straight cuts up to about 6 mm, CNC routing and waterjet for profiles, fibre laser for thin sheet. See our guide to cutting aluminium sheet.
• Keep the film on: PVC film protects decorative faces during cutting and bending; remove it within the time the film supplier states to avoid adhesive residue.
• Allow bend radii: 3003-H14 and 5052-H32 bend around about 1 × thickness; 6061-T6 needs closer to 1.5 – 3 × thickness.
• Store flat and dry: water trapped between stacked sheets causes white staining that will not polish out.

What to specify when ordering 4x8 sheet

1. Alloy and temperFor example 5052-H32 or 6061-T6, with the standard (ASTM B209, EN 485, JIS H4000).
2. Size and thicknessTrue 48 × 96 in or metric 1220 × 2440 mm, and thickness in inches or millimetres rather than gauge.
3. FinishMill, PVC-film one or both sides, brushed, tread pattern, painted colour or anodised.
4. Quantity and packingNumber of sheets, maximum bundle weight for your handling equipment, interleaving if needed.
5. Documents and deliveryMill test certificate (EN 10204 3.1), destination and terms: EXW, FOB, CIF or DAP.

Price depends mainly on the aluminium market on the order date, the alloy and temper, the thickness (very thin sheet costs more per kilogram), the finish and the freight route. We quote each enquiry against current market conditions.

Grades and guides related to 4x8 sheet

4x8 aluminium (aluminum) sheet: FAQs