What is the EN equivalent of 42CrMo4?

42CrMo4 (DIN/European) is equivalent to EN19 / 708M40 (BS 970) and AISI 4140 (American). All three designations refer to the same chromium-molybdenum alloy steel.

What is the EN equivalent of AISI 4340?

AISI 4340 is equivalent to EN24 / 817M40 (BS 970) and 34CrNiMo6 / 1.6582 (European). In the quenched and tempered condition it is designated EN24T / 817M40T.

What is the BS 970 equivalent of SAE 8620?

SAE 8620 is equivalent to 805M20 in BS 970 and 20NiCrMo2-2 / 1.6523 in the European standard.

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Technical Library

Steel Grade Equivalents

Cross-reference British (BS 970), European (EN), German (DIN/Werkstoff) and American (AISI/SAE) steel grades.

📋 BS 970 / EN Cross-Reference

🔬 Interactive Chemical Comparison

💡 Application Analysis

⚡ 26 grades in the comparison table

Chemical Composition Comparison (% by weight — typical midpoint values)

EN / Old BS ↕	BS 970 (1991) ↕	DIN / Werkstoff ↕	AISI / SAE ↕	ISO / EN (European) ↕	Category ↕	Data Sheet

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Grade equivalence note: Grade designations across standards are approximate equivalents — chemical composition ranges may differ slightly. Always verify with your material test certificate and confirm with our technical team if the application is safety-critical. Click ↓ PDF to download the full data sheet for any grade.

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