Strong Match — 87.9% match
based on chemical composition and mechanical property overlap.
BS 970 EN325 (BS 970:1955) and SAE J404 4320 (SAE J404:2009) are both steel grades.
Both fall under the Alloy Steel category.
BS 970 EN325 is defined under British Standards (BS), originating from United Kingdom, while SAE J404 4320 is defined under SAE International, originating from United States.
As per chemical composition, BS 970 EN325 vs SAE J404 4320 is a 87.9% 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 87.9%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
BS 970 EN325
SAE J404 4320
Tensile Strength
≥849 MPa (55 tons/sq in, converted)
Not specified
Elongation
≥15%
Not specified
Condition
core, min (lowest-strength condition of the standard)
Not specified
Typical Applications
BS 970 EN325
Not documented
SAE J404 4320
Used for gears, shafts, aircraft components, pinions, axles, and transmission parts.
Can BS 970 EN325 Be Substituted With SAE J404 4320?
BS 970 EN325 and SAE J404 4320 overlap closely enough on chemistry and mechanical properties that SAE J404 4320 is often considered as a substitute for BS 970 EN325 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 BS 970 EN325 and SAE J404 4320?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN325 be substituted with SAE J404 4320?
BS 970 EN325 and SAE J404 4320 overlap closely enough on chemistry and mechanical properties that SAE J404 4320 is often considered as a substitute for BS 970 EN325 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.