Close Alternative — 83.7% match
based on chemical composition and mechanical property overlap.
BS 970 EN18 (BS 970:1955) and SAE J404 5130 (SAE J404:2009) are both steel grades.
Both fall under the Alloy Steel category.
BS 970 EN18 is typically used for gears, shafts, high tensile fasteners, while SAE J404 5130 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope.
BS 970 EN18 is defined under British Standards (BS), originating from United Kingdom, while SAE J404 5130 is defined under SAE International, originating from United States.
As per chemical composition, BS 970 EN18 vs SAE J404 5130 is a 83.7% 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 83.7%.
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 EN18
SAE J404 5130
Tensile Strength
≥695 MPa (45 tons/sq in, converted)
Not specified
Yield Strength
≥525 MPa (34 tons/sq in, converted)
Not specified
Elongation
≥22%
Not specified
Hardness
201-255 HB
Not specified
Condition
Hardened and tempered R, ruling section 4 in (lowest-strength condition of the standard)
Not specified
Typical Applications
BS 970 EN18
Gears, shafts, high tensile fasteners
SAE J404 5130
Chemistry-only alloy steel grade; see the composition notes for product scope
Can BS 970 EN18 Be Substituted With SAE J404 5130?
BS 970 EN18 and SAE J404 5130 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 BS 970 EN18 and SAE J404 5130?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN18 be substituted with SAE J404 5130?
BS 970 EN18 and SAE J404 5130 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.