Close Alternative — 79.2% match
based on chemical composition and mechanical property overlap.
SAE J404 4120 (SAE J404:2000) and KS D3867 SCM415 (KS D 3867:2025) are both steel grades.
Both fall under the Alloy Steel category.
SAE J404 4120 is typically used for chemistry-only alloy steel grade; see the composition notes for product scope, while KS D3867 SCM415 is commonly used for gears, shafts, camshafts, piston pins, precision machine components requiring hard surface and tough core..
SAE J404 4120 is defined under SAE International, originating from United States, while KS D3867 SCM415 is defined under Korean Industrial Standards (KS), originating from South Korea.
As per chemical composition, SAE J404 4120 vs KS D3867 SCM415 is a 79.2% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a close alternative overall at 79.2%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
SAE J404 4120
Chemistry-only alloy steel grade; see the composition notes for product scope
KS D3867 SCM415
Gears, shafts, camshafts, piston pins, precision machine components requiring hard surface and tough core.
Can SAE J404 4120 Be Substituted With KS D3867 SCM415?
SAE J404 4120 and KS D3867 SCM415 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
What is the difference between SAE J404 4120 and KS D3867 SCM415?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can SAE J404 4120 be substituted with KS D3867 SCM415?
SAE J404 4120 and KS D3867 SCM415 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.