Strong Match — 97.5% match
based on chemical composition and mechanical property overlap.
BS 970 (Part 1) 080M40 (BS 970 (Part 1):1983) and SAE J403 1040 (SAE J403:2014) are both steel grades.
Both fall under the Carbon Steel category.
BS 970 (Part 1) 080M40 is typically used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6., while SAE J403 1040 is commonly used for chemistry-only grade; product scope as listed in the composition notes.
BS 970 (Part 1) 080M40 is defined under British Standards (BS), originating from United Kingdom, while SAE J403 1040 is defined under SAE International, originating from United States.
As per chemical composition, BS 970 (Part 1) 080M40 vs SAE J403 1040 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
BS 970 (Part 1) 080M40
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
SAE J403 1040
Chemistry-only grade; product scope as listed in the composition notes
Can BS 970 (Part 1) 080M40 Be Substituted With SAE J403 1040?
BS 970 (Part 1) 080M40 and SAE J403 1040 overlap closely enough on chemistry and mechanical properties that SAE J403 1040 is often considered as a substitute for BS 970 (Part 1) 080M40 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 (Part 1) 080M40 and SAE J403 1040?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 1) 080M40 be substituted with SAE J403 1040?
BS 970 (Part 1) 080M40 and SAE J403 1040 overlap closely enough on chemistry and mechanical properties that SAE J403 1040 is often considered as a substitute for BS 970 (Part 1) 080M40 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.