Strong Match — 97.5% match
based on chemical composition and mechanical property overlap.
SAE J403 1039 (SAE J403:2014) and BS 970 (Part 1) 080M40 (BS 970 (Part 1):1983) are both steel grades.
Both fall under the Carbon Steel category.
SAE J403 1039 is typically used for chemistry-only grade; product scope as listed in the composition notes, while BS 970 (Part 1) 080M40 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6..
SAE J403 1039 is defined under SAE International, originating from United States, while BS 970 (Part 1) 080M40 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, SAE J403 1039 vs BS 970 (Part 1) 080M40 is a 97.5% 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 97.5%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
SAE J403 1039
Chemistry-only grade; product scope as listed in the composition notes
BS 970 (Part 1) 080M40
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Can SAE J403 1039 Be Substituted With BS 970 (Part 1) 080M40?
SAE J403 1039 and BS 970 (Part 1) 080M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 080M40 is often considered as a substitute for SAE J403 1039 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 J403 1039 and BS 970 (Part 1) 080M40?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can SAE J403 1039 be substituted with BS 970 (Part 1) 080M40?
SAE J403 1039 and BS 970 (Part 1) 080M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 080M40 is often considered as a substitute for SAE J403 1039 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.