Aluminium Grades Explained: 1050 vs 6063 vs 6082 (UK Guide)
Aluminium comes in dozens of grades, but for UK trade and fabrication a handful cover almost everything: 1050 for sheet, 6063 for architectural sections, 6082 for structural plate and bar, and 5754/5083 for marine and chequer work. This guide explains what each grade is, how they differ in strength, corrosion resistance and heat treatment, and which to choose for your project - with a quick grade recommender to point you at the right one.
Which Aluminium Grade Do I Need?
Pick what you're making for an indicative recommendation.
Aluminium Grades at a Glance
| Grade | Series | Heat-treatable | Strength | Best for |
| 1050 | 1xxx (99.5% pure) | No (work-hardened) | Low | Sheet, cladding, ductwork, fabrication |
| 3003 | 3xxx (Al-Mn) | No | Low-medium | General sheet, ducting, stronger panels |
| 5754 | 5xxx (Al-Mg) | No | Medium | Chequer / tread plate, marine sheet |
| 5083 | 5xxx (Al-Mg) | No | High | Marine plate & bar, high-strength fabrication |
| 6063 | 6xxx (Al-Mg-Si) | Yes (T6) | Medium | Architectural sections - angle, box, tube, channel |
| 6082 | 6xxx (Al-Mg-Si-Mn) | Yes (T6) | High | Structural plate & bar, machining, welding |
All aluminium grades resist corrosion far better than untreated steel, so the choice is usually driven by strength and form (sheet vs extruded section vs plate/bar) rather than corrosion alone.
Grade 1050 - The Standard Sheet Grade
1050 is commercially pure aluminium (minimum 99.5% aluminium) and the most widely used sheet grade in the UK. It has the lowest strength of the common grades but the best corrosion resistance, thermal and electrical conductivity, and formability. Usually supplied in H14 temper (half-hard), it bends and forms cleanly, which is why sheet-metal workers reach for it for cladding, panels, signage and ductwork. See our 1050 H14 aluminium sheet.
Grade 3003 - Stronger General Sheet
3003 adds manganese to give roughly 20% more strength than 1xxx grades while staying non-heat-treatable and very formable. It's used where a plain sheet needs a bit more strength - ducting, panels and general fabrication.
Grades 5754 & 5083 - The Marine Grades
The 5xxx (aluminium-magnesium) grades are non-heat-treatable but gain strength through work hardening, and offer outstanding corrosion resistance in seawater and industrial atmospheres. 5754 is the grade used to make aluminium chequer / tread plate and marine sheet. 5083 is a higher-strength grade supplied as plate or bar for marine and demanding fabrication.
Grade 6063 - The Architectural Section Grade
6063 is a heat-treatable aluminium-magnesium-silicon alloy, medium strength, and the most common grade for extrusion. It forms thin-walled, intricate profiles with an excellent surface finish, which is why it's the standard grade for architectural sections - angle, box section, round tube and channel. It's usually supplied in T6 temper (solution heat-treated and artificially aged) for its full strength.
Grade 6082 - The Structural Grade
6082 is the strongest of the common 6xxx grades and the go-to for structural aluminium plate and bar. It machines and welds well and, in T6 temper, delivers the highest strength for load-bearing fabrication - beams, brackets, machine parts and anywhere you'd otherwise want steel but need the weight saving. (6061 is a closely related grade more common in the US.)
Understanding Tempers - H14 and T6
The letters after the grade describe the temper (how the metal was hardened). H14 (used on 1050 sheet) means half-hard by cold rolling - strong enough to feel solid, soft enough to bend. T6 (used on 6063 and 6082) means solution heat-treated and artificially aged to peak strength - the standard temper for structural and architectural sections. The 5xxx and 1xxx grades are not heat-treatable, so they use H tempers; the 6xxx grades are heat-treatable and use T tempers.
Which Grade Does Rackerman Stock?
We stock the grades that cover the vast majority of UK fabrication:
- 1050 H14 - aluminium sheet for cladding, panels and fabrication.
- 6063 T6 - equal and unequal angle, box & rectangle section, channel, round tube, round bar and flat bar.
- 5754 - aluminium chequer plate for flooring, ramps and vehicle lining.
Work out the weight of any aluminium section with our metal weight calculator.
Frequently Asked Questions
What is the strongest grade of aluminium?
Among the common commercial grades, 6082 T6 is the strongest general-purpose structural grade, and 5083 is the strongest of the non-heat-treatable marine grades. 7000-series aircraft alloys are stronger still but are specialist and rarely stocked for general fabrication.
What is the difference between 6063 and 6082 aluminium?
Both are heat-treatable 6xxx grades usually supplied in T6 temper. 6063 is medium strength with an excellent surface finish, ideal for extruded architectural sections. 6082 is stronger, better suited to structural plate and bar, machining and welding.
Which aluminium grade is best for marine use?
The 5xxx magnesium grades - 5754 for sheet and chequer plate, 5083 for higher-strength plate and bar. They resist seawater corrosion far better than the 6xxx grades.
What grade is aluminium sheet?
Most plain aluminium sheet is grade 1050 (H14 temper) - commercially pure, highly formable and corrosion-resistant. Stronger sheet uses 3003 or the 5xxx grades. Aluminium chequer plate is grade 5754.
What does H14 and T6 mean on aluminium?
They are tempers. H14 means half-hard by cold work (used on 1xxx and 5xxx sheet). T6 means solution heat-treated and artificially aged to peak strength (used on 6xxx sections and plate).
Is aluminium heat treatable?
Only some grades. The 6xxx (6063, 6082) and 7xxx grades are heat-treatable and reach high strength via the T6 process. The 1xxx, 3xxx and 5xxx grades are not heat-treatable and gain strength through work hardening (H tempers).