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BS 970 EN8M vs SAE J403 1140

Close Alternative — 79.9% match based on chemical composition and mechanical property overlap.

BS 970 EN8M (BS 970:1955) and SAE J403 1140 (SAE J403:2001) are both steel grades. Both fall under the Free Machining Steel category. BS 970 EN8M is typically used for high volume turned parts, automotive components, while SAE J403 1140 is commonly used for chemistry-only grade; product scope as listed in the composition notes. BS 970 EN8M is defined under British Standards (BS), originating from United Kingdom, while SAE J403 1140 is defined under SAE International, originating from United States.

As per chemical composition, BS 970 EN8M vs SAE J403 1140 is a 79.9% 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 79.9%.

Frequently Compared With BS 970 EN8M:
SAE J403 1140 SAE J403 1141 SAE J403 1118 SAE J403 1138 SAE J403 1138 IS 4432 10C8S10 SAE J403 1138 IS 1570 (Part 3) 10C8S10 SAE J403 1117 SAE J403 1117 SAE J403 1117 SAE J403 1118
Match Breakdown
CHEMISTRY MATCH
79.9%
MECHANICAL MATCH
No shared data
OVERALL
79.9%
Specifications
Property BS 970 EN8M SAE J403 1140
Standard BS 970:1955 SAE J403:2001
Category Free Machining Steel Free Machining Steel
C (%) 0.35-0.45 0.37-0.44
Si (%) <=0.25 Not specified
Mn (%) 1.0-1.30 0.70-1.00
S (%) 0.12-0.20 0.08-0.13
P (%) <=0.060 <=0.030
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 EN8M SAE J403 1140
Tensile Strength ≥541 MPa (35 tons/sq in, converted) Not specified
Yield Strength ≥278 MPa (18 tons/sq in, converted) Not specified
Elongation ≥20% Not specified
Hardness 152-207 HB Not specified
Condition Normalised, ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN8M
High volume turned parts, automotive components
SAE J403 1140
Chemistry-only grade; product scope as listed in the composition notes
Key Differences
Can BS 970 EN8M Be Substituted With SAE J403 1140?
BS 970 EN8M and SAE J403 1140 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
BS 970 EN8M
Round Bar → (3 listings)
Diameter: 60–60 mm (2.36–2.36 in)
Length: 4000–6900 mm (157.48–271.65 in)
SAE J403 1140
No active listings currently.
On M-EX Right Now
BS 970 EN8M
3 active listings and RFQs →
SAE J403 1140
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN8M and SAE J403 1140?
BS 970 EN8M specifies Si which is not specified for SAE J403 1140.
Can BS 970 EN8M be substituted with SAE J403 1140?
BS 970 EN8M and SAE J403 1140 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.