EN, SAE and DIN Equivalents for Common Alloy Steel Grades
Approximate cross-reference between EN, SAE/AISI, DIN and JIS grades for common forging steels.
Read this first
Grade equivalents are approximate. Chemistry limits differ slightly between standards. Always check the exact limits in your order, and confirm with the supplier.
Common equivalents
EN8 is close to C45 and SAE 1040/1045. EN19 is close to SAE 4140 and 42CrMo4. EN24 is close to SAE 4340 and 34CrNiMo6. EN31 is close to SAE 52100 and 100Cr6. 16MnCr5 and 20MnCr5 are German case hardening grades, with SAE 5115 and 5120 as rough American counterparts.
Why the difference matters
A drawing that cites an EN grade and an order that cites an SAE grade can lead to a rejected lot if the limits on carbon, manganese or residuals are not the same. Quote the standard and edition on the order.
See individual grades
Each grade has its own page with its chemistry range, equivalents and applications. Start from the grade directory.
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