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SAE J403 1021 vs BS 970 (Part 1) 040A10

Close Alternative — 84.6% match based on chemical composition and mechanical property overlap.

SAE J403 1021 (SAE J403:2001) and BS 970 (Part 1) 040A10 (BS 970 (Part 1):1991) 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) 040A10 is commonly used for used for bolts, studs, shafts, brackets, fabricated components, and general engineering parts.. SAE J403 1021 is defined under SAE International, originating from United States, while BS 970 (Part 1) 040A10 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, SAE J403 1021 vs BS 970 (Part 1) 040A10 is a 84.6% 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 84.6%.

Frequently Compared With SAE J403 1021:
BS 970 (Part 1) 080A20 BS 970 (Part 1) 070M20 BS 970 (Part 3) 070M55 BS 970 (Part 3) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 040A12
Match Breakdown
CHEMISTRY MATCH
84.6%
MECHANICAL MATCH
No shared data
OVERALL
84.6%
Specifications
Property SAE J403 1021 BS 970 (Part 1) 040A10
Standard SAE J403:2001 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.18-0.23 0.08-0.13
Mn (%) 0.60-0.90 0.30-0.50
P (%) <=0.030 Not specified
S (%) <=0.050 Not specified
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) 040A10
Used for bolts, studs, shafts, brackets, fabricated components, and general engineering parts.
Key Differences
Can SAE J403 1021 Be Substituted With BS 970 (Part 1) 040A10?
SAE J403 1021 and BS 970 (Part 1) 040A10 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.
Forms & Sizes Available on M-EX
SAE J403 1021
No active listings currently.
BS 970 (Part 1) 040A10
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 4700–5500 mm (185.04–216.54 in)
On M-EX Right Now
SAE J403 1021
0 active listings and RFQs →
BS 970 (Part 1) 040A10
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between SAE J403 1021 and BS 970 (Part 1) 040A10?
SAE J403 1021 specifies P, S which are not specified for BS 970 (Part 1) 040A10.
Can SAE J403 1021 be substituted with BS 970 (Part 1) 040A10?
SAE J403 1021 and BS 970 (Part 1) 040A10 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.