{"id":3973,"date":"2026-09-15T23:49:09","date_gmt":"2026-09-15T20:49:09","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3973"},"modified":"2026-09-17T23:06:44","modified_gmt":"2026-09-17T20:06:44","slug":"en-aw-7075-en-aw-2017a-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/en-aw-7075-en-aw-2017a-difference\/","title":{"rendered":"What Is the Difference Between EN AW 7075 and EN AW 2017A?"},"content":{"rendered":"

EN AW 7075<\/strong> and EN AW 2017A<\/strong> are two high-strength grades of aluminium. Both are used in aerospace and both harden by heat treatment \u2014 but they rely on different main alloying elements.<\/p>\n

Zinc, or copper?<\/h3>\n

7075 is a 7000 series<\/strong> alloy: its main alloying element is zinc (5.10\u20136.10%)<\/strong>, alongside 2.10\u20132.90% magnesium<\/strong> and 1.20\u20132.00% copper<\/strong>. The zinc\u2013magnesium system gives the highest strength attainable in aluminium.<\/p>\n

2017A is a 2000 series<\/strong> alloy: its main element is copper (3.50\u20134.50%)<\/strong>, alongside 0.40\u20131.00% magnesium and manganese. Copper-based alloys are not as strong as the 7000 series but they machine better and are more stable at high temperature.<\/p>\n

The difference on our datasheets is clear: the yield strength of 7075 is 410 MPa<\/strong> and its tensile strength 510 MPa<\/strong>. In 2017A those are 270<\/strong> and 390 MPa<\/strong>. 7075 is also heavier (2.81 against 2.79 g\/cm\u00b3) and gives lower elongation (8% against 15%).<\/p>\n

Both alloys are considered non-weldable<\/strong>; joining is done with rivets or bolts. The classic form of use for 2017A is in fact the rivet.<\/p>\n

Comparison in numbers<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PROPERTY<\/th>\nEN AW 7075<\/th>\nEN AW 2017A<\/th>\n<\/tr>\n<\/thead>\n
Zinc (Zn)<\/td>\n5.10 \u2013 6.10%<\/td>\nmax 0.25%<\/td>\n<\/tr>\n
Copper (Cu)<\/td>\n1.20 \u2013 2.00%<\/td>\n3.50 \u2013 4.50%<\/td>\n<\/tr>\n
Magnesium (Mg)<\/td>\n2.10 \u2013 2.90%<\/td>\n0.40 \u2013 1.00%<\/td>\n<\/tr>\n
Manganese (Mn)<\/td>\nmax 0.30%<\/td>\n0.40 \u2013 1.00%<\/td>\n<\/tr>\n
Chromium (Cr)<\/td>\n0.18 \u2013 0.28%<\/td>\nmax 0.10%<\/td>\n<\/tr>\n
Silicon (Si)<\/td>\nmax 0.40%<\/td>\n0.20 \u2013 0.80%<\/td>\n<\/tr>\n
Iron (Fe)<\/td>\nmax 0.50%<\/td>\nmax 0.70%<\/td>\n<\/tr>\n
Tensile strength<\/td>\n510 MPa<\/td>\n390 MPa<\/td>\n<\/tr>\n
Yield strength<\/td>\n410 MPa<\/td>\n270 MPa<\/td>\n<\/tr>\n
Shear strength<\/td>\n300 MPa<\/td>\n\u2014<\/td>\n<\/tr>\n
Elongation<\/td>\n8%<\/td>\n15%<\/td>\n<\/tr>\n
Density<\/td>\n2.81 g\/cm\u00b3<\/td>\n2.79 g\/cm\u00b3<\/td>\n<\/tr>\n
Modulus of elasticity<\/td>\n72 GPa<\/td>\n72 GPa<\/td>\n<\/tr>\n
Thermal conductivity<\/td>\n155 W\/m\u00b7K<\/td>\n140 W\/m\u00b7K<\/td>\n<\/tr>\n
Electrical conductivity<\/td>\n33% IACS<\/td>\n\u2014<\/td>\n<\/tr>\n
AMS<\/td>\n4078 \u00b7 4124<\/td>\n4110 \u00b7 4116 \u00b7 4118<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Values are taken from our product datasheets; section thickness and the applied heat treatment regime change the result.<\/p>\n

Which one, and when?<\/h3>\n

EN AW 7075 is required<\/strong> \u2014 aircraft structural members, wing and fuselage frames, defence industry parts, high-performance mould plates, racing car components, weapon parts. Anywhere the highest strength attainable in aluminium is wanted.<\/p>\n

EN AW 2017A is preferred<\/strong> \u2014 rivets and fasteners, machined components, hydraulic parts, medium-strength aerospace parts. Its machinability is very good and it is more economical than 7075.<\/p>\n

Note: 7075 is susceptible to stress corrosion cracking; for critical applications overaged tempers such as T73 or T7351 are therefore preferred.<\/p>\n

Neighbouring grades<\/h3>\n

For lower strength but weldability, see our EN AW 6082 \u2013 6060 comparison<\/a>; for marine environments, EN AW 5083<\/a>.<\/p>\n

\n

Technical datasheets<\/p>\n

EN AW 7075 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

EN AW 2017A \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n

Both grades are supplied to order in round bar, flat bar, plate, sheet, pipe and forged forms. Contact us<\/a> for a quotation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EN AW 7075 is zinc-based and stronger; 2017A is copper-based and easier to machine.<\/p>\n","protected":false},"author":1,"featured_media":3431,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3973","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"\nWhat Is the Difference Between EN AW 7075 and EN AW 2017A? - Defence Metal<\/title>\n<meta name=\"description\" content=\"EN AW 7075 is zinc-based and stronger; 2017A is copper-based and easier to machine.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/en-aw-7075-en-aw-2017a-difference\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is the Difference Between EN AW 7075 and EN AW 2017A? 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