Is 7075 stronger than 6061?

Yes, much stronger: about 560 MPa tensile in T6 against about 300 MPa for 6061-T6.

Not reliably by normal TIG or MIG welding; it cracks. Use mechanical joints, or another alloy if welding is needed.

Can 7075 be used for moulds?

Yes, for prototype and low-volume plastic moulds: it machines fast and conducts heat well, though it wears faster than mould steel.

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Aluminium 7075

Also called: 7075-T6, EN AW-7075, AlZn5.5MgCu, aircraft aluminium, 7075 T651

Aluminium 7075 is a zinc-magnesium-copper alloy and one of the strongest aluminium alloys, close to many steels in strength at one third the weight. It machines very well but is hard to weld and less corrosion-resistant, so it is used for highly stressed parts rather than general fabrication.

Quick facts

Type: Wrought aluminium alloy, 7xxx series
Common temper: T6 / T651
Tensile strength (T6): About 540–570 MPa
Yield strength (T6): About 480–500 MPa
Hardness (T6): About 150 HB
Weldability: Poor by normal fusion welding

Equivalent grades

Standard	Grade
AA / EN 573	7075 / EN AW-7075 (AlZn5.5MgCu)

Typical chemical composition

Element	%
Zinc (Zn)	5.1–6.1
Magnesium (Mg)	2.1–2.9
Copper (Cu)	1.2–2.0
Chromium (Cr)	0.18–0.28
Aluminium	Balance

Points to know

Excellent machinability and dimensional stability (T651 is stress relieved)
Not suitable for normal fusion welding: design bolted or riveted joints
Lower corrosion resistance than 6061: anodise or coat it
Costs more than 6000-series alloys

Typical uses

Aerospace and defence parts
High-stress machined parts and fixtures
Moulds for prototype and low-volume plastic parts
Bicycle and sports equipment
Gears and shafts in light machines

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Related job work

VMC / CNC milling

Machines

Materials

Questions

Is 7075 stronger than 6061?: Yes, much stronger: about 560 MPa tensile in T6 against about 300 MPa for 6061-T6.
Can 7075 be welded?: Not reliably by normal TIG or MIG welding; it cracks. Use mechanical joints, or another alloy if welding is needed.
Can 7075 be used for moulds?: Yes, for prototype and low-volume plastic moulds: it machines fast and conducts heat well, though it wears faster than mould steel.

The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 8 October 2026.