{"id":3683,"date":"2026-09-16T11:18:17","date_gmt":"2026-09-16T08:18:17","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/en-aw-7075\/"},"modified":"2026-09-25T16:27:02","modified_gmt":"2026-09-25T13:27:02","slug":"en-aw-7075","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/en-aw-7075\/","title":{"rendered":"EN AW 7075"},"content":{"rendered":"

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EN AW 7075 \/ AMS 4078 \/ AMS 4124<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
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EN AW-7075<\/div>\n
EN AW-7075 \u00b7 AlZn5.5MgCu \u00b7 W.Nr. 3.4365 \u00b7 UNS A97075 \u00b7 Per EN 573-3: Zn 5.1-6.1 % \u2013 Mg 2.1-2.9 % \u2013 Cu 1.2-2.0 % \u2013 Cr 0.18-0.28 % \u2013 Fe max 0.50 % \u2013 Si max 0.40 % \u2013 Mn max 0.30 % \u2013 Ti max 0.20 % \u2013 balance Al. This is a 7xxx series Al-Zn-Mg-Cu alloy and it IS HEAT-TREATABLE: solution treatment 470-480 \u00b0C + quench + ARTIFICIAL ageing. Hardening comes from MgZn2 (eta’) precipitation. The tempers are O, T6, T651, T73 and T7351. T73\/T7351 are OVERAGED tempers: strength is deliberately lowered and resistance to stress corrosion cracking (SCC) is bought in exchange.<\/div>\n
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Not to be confused with<\/div>\n

EN AW 6082<\/a>EN AW 2017A<\/a><\/div>\n<\/div>\n

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For what<\/div>\n
Bought where the highest strength available from aluminium is required, for parts that WILL NOT BE WELDED and that will be protected by plating or anodising: aircraft structural parts, aircraft fasteners, defence components, highly loaded machine parts, mould and model plate, billets from which\u2026<\/div>\n<\/div>\n
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Forms<\/div>\n
Round bar \u00b7 flat bar \u00b7 plate \u00b7 sheet \u00b7 tube \u00b7 forgings. All forms are supplied to order.<\/div>\n<\/div>\n
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Standards<\/div>\n
AMS 4044<\/b> (7075-O annealed or 7075-F sheet and plate) \u00b7 AMS 4045<\/b> (7075-T6 sheet \/ 7075-T651 plate, solution and precipitation heat treated) \u00b7 AMS 4078<\/b> (7075-T73 sheet \/ 7075-T7351 plate, solution heat treated and OVERAGED) \u00b7 AMS 4124<\/b> (7075-T73 \/ T7351 rolled or cold finished bars, rods and wire; stress relieved by stretching and overaged) \u00b7 AMS 4126<\/b> (7075-T6 die and hand forgings and rolled rings) \u00b7 AMS 4141<\/b> (7075-T73 die forgings) \u00b7 AMS-QQ-A-200\/11 and AMS-QQ-A-225\/9 (extrusions and bar) \u00b7 ASTM B209\/B209M (sheet and plate) \u00b7 ASTM B211 (rolled or cold finished bar, rod and wire) \u00b7 ASTM B221 (extrusions) \u00b7 EN 573-3 (composition) \u00b7 EN 515 (tempers) \u00b7 EN 485-1\/-2\/-3\/-4 (flat products) \u00b7 EN 755-1\/-2 (extrusions) \u00b7 EN 754-1\/-2 (cold drawn) \u00b7 EN 586-1\/-2\/-3 (forgings)
AMS 4044, 4045, 4078, 4124 and 4126 were each verified INDIVIDUALLY against SAE title records and all five are 7075; but THE FIVE COVER DIFFERENT TEMPERS AND FORMS and are not interchangeable: 4044 = O\/F sheet and plate, 4045 = T6 sheet and T651 plate, 4078 =\u2026<\/span><\/div>\n<\/div>\n
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Advantage<\/div>\n
By far the highest strength of the five: EN 485-2 requires Rp0.2 min 460 MPa and Rm min 540 MPa for T651 plate of 6-12.5 mm; EN 755-2 gives 505 MPa \/ 570 MPa for T6 extruded rod up to 25 mm. In the same standard family the limit for 6082 T6 is 260 MPa \/ 310 MPa.<\/div>\n<\/div>\n
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Welding<\/div>\n
NOT SUITABLE FOR FUSION WELDING. The BIKAR data sheet rates gas, TIG and MIG as 5 (unsuitable); the Alcoa weldability table simply states NO for 7075; Batz+Burgel gives gas\/TIG\/MIG its lowest mark.<\/div>\n<\/div>\n
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Limits<\/div>\n
THE GOVERNING LIMIT IS STRESS CORROSION CRACKING (SCC). Kaiser Aluminum rates the T6 and T651 tempers of 7075 as ‘C’ in its SCC resistance classification and defines that as ‘service failures with sustained tension stress acting in the short transverse direction’.<\/div>\n<\/div>\n
REQUEST A QUOTE<\/a>All aluminium alloys →<\/a>TECHNICAL DETAILS ↓<\/span><\/div>\n
Compiled from manufacturer data sheets \u00b7 confirm against the current specification before ordering<\/div>\n<\/div>\n<\/div>\n

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