Strong Match — 85.7% match
based on chemical composition and mechanical property overlap.
SAE J403 1021 (SAE J403:2014) and BS 970 (Part 1) 045M10 (BS 970 (Part 1):1983) are both steel grades.
Both fall under the Carbon Steel category.
SAE J403 1021 is typically used for chemistry-only grade; product scope as listed in the composition notes, while BS 970 (Part 1) 045M10 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties)..
SAE J403 1021 is defined under SAE International, originating from United States, while BS 970 (Part 1) 045M10 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, SAE J403 1021 vs BS 970 (Part 1) 045M10 is a 85.7% 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 85.7%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
SAE J403 1021
Chemistry-only grade; product scope as listed in the composition notes
BS 970 (Part 1) 045M10
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Can SAE J403 1021 Be Substituted With BS 970 (Part 1) 045M10?
SAE J403 1021 and BS 970 (Part 1) 045M10 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 045M10 is often considered as a substitute for SAE J403 1021 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 1021 and BS 970 (Part 1) 045M10?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can SAE J403 1021 be substituted with BS 970 (Part 1) 045M10?
SAE J403 1021 and BS 970 (Part 1) 045M10 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 045M10 is often considered as a substitute for SAE J403 1021 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.