Close Alternative — 79% match
based on chemical composition and mechanical property overlap.
BS 970 EN5 (BS 970:1955) and BS 970 (Part 1) 040A12 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Carbon Steel category.
BS 970 EN5 is typically used for gears, shafts, couplings, general engineering, while BS 970 (Part 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two).
BS 970 EN5 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 040A12 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, BS 970 EN5 vs BS 970 (Part 1) 040A12 is a 79% 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%.
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 EN5
BS 970 (Part 1) 040A12
Tensile Strength
≥494 MPa (32 tons/sq in, converted)
Not specified
Yield Strength
≥247 MPa (16 tons/sq in, converted)
Not specified
Elongation
≥25%
Not specified
Hardness
143-193 HB
Not specified
Condition
Normalised, ruling section 2 1/2 in (lowest-strength condition of the standard)
Not specified
Typical Applications
BS 970 EN5
Gears, shafts, couplings, general engineering
BS 970 (Part 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
BS 970 EN5 specifies Si, S, P which are not specified for BS 970 (Part 1) 040A12.
Can BS 970 EN5 Be Substituted With BS 970 (Part 1) 040A12?
BS 970 EN5 and BS 970 (Part 1) 040A12 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 EN5 and BS 970 (Part 1) 040A12?
BS 970 EN5 specifies Si, S, P which are not specified for BS 970 (Part 1) 040A12.
Can BS 970 EN5 be substituted with BS 970 (Part 1) 040A12?
BS 970 EN5 and BS 970 (Part 1) 040A12 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.