It cross-references material designations for aluminum, steel, stainless steel, and copper/brass across international standards including EN, DIN, ISO, AA, AISI, SAE, UNS, JIS, BS, AFNOR, and others. Enter a designation you know, and the tool detects the material family and source standard, then returns the equivalent in the standard you select, flagged as an exact match, a close match, or no direct equivalent. Aluminum mappings follow Aluminum Association and EN 573 registrations, copper and brass mappings follow Copper Development Association and EN 1412 references, and steel mappings follow EN 10027-2, SAE J1086, and ASTM/UNS documentation. For background on the aluminum series, see the full aluminum designation guide.

Not always. An exact match means the same alloy with the same composition limits, registered under a different standard’s numbering. A close match means the two designations are related but not identical, for example a registered national variation such as EN AW-1050A versus AA 1050, or two different grades that engineers routinely substitute. Product form, temper, and heat-treatment condition can also differ between standards, so confirm against the target specification for critical applications.

DIN is Germany’s national standard, EN is the harmonized European standard that has largely replaced national systems like DIN and BS for new specifications, and ISO is the international standard used as a common reference outside Europe. Many EN designations share identical composition limits with their DIN or ISO predecessors, which is why cross-referencing them is possible. The steel reference standards guide covers how these systems evolved for steel.

Each country or region developed its material standards independently, often decades apart, so naming conventions reflect local industrial history rather than a shared logic. Some cross-standard names are exact matches: a German engineer’s 1.4301 and a US engineer’s AISI 304 are the same alloy. Others are regional substitutes rather than true equivalents. AA 6061 (common in the US) and EN AW-6082 (common in Europe) are both 6000-series aluminum alloys used for similar applications, but they have different magnesium and silicon content and different mechanical properties. They are not a drop-in substitute for each other, which is exactly the kind of distinction this tool flags.

A Werkstoff number (material number) is Germany’s numeric material identification system, carried into EN 10027-2 for steels. The first digit indicates the material group (1 for steel, 2 for copper-based and other heavy nonferrous metals, 3 for aluminum and other light metals), the next two digits give the steel group, and the last two distinguish the grade. 1.4301 therefore identifies an austenitic stainless steel without molybdenum, niobium, or titanium: the grade known as AISI 304 in the US system.

In most general engineering applications, yes, but check the specific mechanical property requirements first. AISI/SAE and EN grades that share a chemistry-based equivalence can still have different minimum yield strength or impact test requirements, which matters more for structural, pressure-rated, or safety-critical parts. If your specification calls out hardness rather than strength, the Metal Hardness Converter translates between Rockwell, Brinell, and Vickers scales.

Some alloys were developed for a specific market and were never registered under other systems, so no direct equivalent exists. In these cases, the closest chemical match is usually still worth reviewing, but treat it as a starting point for supplier discussion, not a drop-in substitution.

Aerospace, medical, and pressure equipment industries typically specify materials by exact standard and revision, where even a close equivalent is not acceptable without formal material substitution approval. For general mechanical and consumer parts, chemistry-based equivalents are usually sufficient for sourcing decisions.

Yes. AISI 304 (US) and EN 1.4301 (Europe) are the same austenitic chromium-nickel stainless steel, also known by its chemical designation X5CrNi18-10. It is one of the most searched material equivalence questions online, and it is a genuine one-to-one match, not just a close substitute.

No. Both are 6000-series aluminum-magnesium-silicon alloys used for similar structural and machined parts, but they are two distinct, separately registered alloys, not the same alloy under different standards. EN AW-6082 carries more magnesium and silicon and generally tests stronger; AA 6061 is generally more machinable. They are commonly substituted for each other but are not a drop-in substitute for stress-critical parts. European suppliers can also source 6061 directly as EN AW-6061, its exact EN registration. The aluminum alloys guide compares the 6000 series in more detail.

Beyond AA 6061 and EN AW-6082, the converter flags three widely documented substitute pairs. In hot-work tool steel, 1.2343 (H11) and 1.2344 (H13) share a 5% chromium base, but H13 carries more vanadium for hot wear resistance while H11 offers higher toughness. In stainless steel, 1.4404 and 1.4435 are both sold as AISI 316L, but 1.4435 carries more nickel and molybdenum and is often specified explicitly for pharmaceutical and chloride service. In free-cutting brass, CW614N (CuZn39Pb3) and UNS C36000 machine similarly but differ in copper content and lead limits. Treat each pair as a starting point for supplier discussion, not a drop-in substitution. See the copper and brass grades guide for more on leaded brasses.

Some standards group several distinct grades under one designation. AISI 420, for example, covers a carbon range that EN splits into separate grades such as 1.4021 (X20Cr13) and 1.4034 (X46Cr13), and AISI 1045 maps to both 1.0503 (C45) and the tool steel 1.1730 (C45W). When a search matches more than one grade, the converter asks you to pick the one on your drawing. When a converted value is shared by other grades, the result lists them so you can specify the exact grade on the purchase order.