Strong Match — 96.2% match
based on chemical composition and mechanical property overlap.
SAE J404 4340 (SAE J404:2009) and SAE J404 E4340 (SAE J404:2000) are both steel grades.
Both fall under the Alloy Steel category.
SAE J404 4340 is typically used for aircraft parts, heavy duty gears, crankshafts, while SAE J404 E4340 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope.
SAE J404 4340 is defined under SAE International, originating from United States, while SAE J404 E4340 is defined under SAE International, originating from United States.
As per chemical composition, SAE J404 4340 vs SAE J404 E4340 is a 96.2% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a strong match overall at 96.2%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
SAE J404 4340
Aircraft parts, heavy duty gears, crankshafts
SAE J404 E4340
Chemistry-only alloy steel grade; see the composition notes for product scope
Can SAE J404 4340 Be Substituted With SAE J404 E4340?
SAE J404 4340 and SAE J404 E4340 overlap closely enough on chemistry and mechanical properties that SAE J404 E4340 is often considered as a substitute for SAE J404 4340 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
What is the difference between SAE J404 4340 and SAE J404 E4340?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can SAE J404 4340 be substituted with SAE J404 E4340?
SAE J404 4340 and SAE J404 E4340 overlap closely enough on chemistry and mechanical properties that SAE J404 E4340 is often considered as a substitute for SAE J404 4340 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.