Material Grade Equivalents: AISI, EN and JIS for CNC Parts

European drawings usually call out EN grades, American drawings AISI/SAE or Aluminum Association grades, and Asian suppliers often stock JIS grades. This table lists the nearest common equivalents so you can specify material confidently when sourcing internationally.

Equivalent grades are close but not always identical in composition or properties. If a property is critical, state the exact standard and grade on your drawing.

Aluminum alloys

6061 (AA) — EN AW-6061 (AlMg1SiCu) — JIS A6061
6082 — EN AW-6082 (AlSi1MgMn) — common European alternative to 6061
7075 (AA) — EN AW-7075 (AlZn5.5MgCu) — JIS A7075
2024 (AA) — EN AW-2024 (AlCu4Mg1) — JIS A2024
5052 (AA) — EN AW-5052 (AlMg2.5) — JIS A5052

Carbon and alloy steels

AISI 1045 — EN C45 (1.0503) — JIS S45C
AISI 1020 — EN C22 (1.0402) — JIS S20C
AISI 4140 — EN 42CrMo4 (1.7225) — JIS SCM440
AISI 4340 — EN 34CrNiMo6 (1.6582), nearest — JIS SNCM439, nearest
AISI 12L14 (free-machining) — EN 11SMnPb30 (1.0718) — JIS SUM24L

Stainless steels

AISI 303 — EN 1.4305 (X8CrNiS18-9) — JIS SUS303
AISI 304 — EN 1.4301 (X5CrNi18-10) — JIS SUS304
AISI 316 — EN 1.4401 (X5CrNiMo17-12-2) — JIS SUS316

Brass

C36000 (free-cutting brass) — EN CW614N (CuZn39Pb3) — JIS C3604

Specifying material on international orders

Write the standard and the grade, for example “EN AW-6082-T6” or “AISI 4140, quenched and tempered”, and say whether an equivalent is acceptable. That avoids back-and-forth and wrong material.

Chi Xin Technology is a CNC machine shop in Nantun District, Taichung, Taiwan, founded in 2022. We run 5+ CNC machines — 4.5-axis CNC machining centers and CNC lathes — and mainly machine aluminum alloys and alloy steel, with a metal tolerance of 0.02 mm. We also offer wire EDM and surface finishing including anodizing, and we export to customers in Europe and North America.