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BS 970 EN100D vs SAE J404 8740

Close Alternative — 81.1% match based on chemical composition and mechanical property overlap.

BS 970 EN100D (BS 970:1955) and SAE J404 8740 (SAE J404:2000) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN100D is defined under British Standards (BS), originating from United Kingdom, while SAE J404 8740 is defined under SAE International, originating from United States.

As per chemical composition, BS 970 EN100D vs SAE J404 8740 is a 81.1% 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 81.1%.

Frequently Compared With BS 970 EN100D:
IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 UNI 11234 100Cr6 IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Mo6H
Match Breakdown
CHEMISTRY MATCH
81.1%
MECHANICAL MATCH
No shared data
OVERALL
81.1%
Specifications
Property BS 970 EN100D SAE J404 8740
Standard BS 970:1955 SAE J404:2000
Category Alloy Steel Alloy Steel
C (%) 0.40-0.45 0.40-0.45
Si (%) 0.10-0.50 0.15-0.35
Mn (%) 1.20-1.50 0.75-1.00
Ni (%) 0.50-1.00 0.40-0.70
Cr (%) 0.30-0.60 0.40-0.60
Mo (%) 0.15-0.25 0.15-0.25
S (%) <=0.050 <=0.040
P (%) <=0.050 <=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 EN100D SAE J404 8740
Tensile Strength ≥695 MPa (45 tons/sq in, converted) Not specified
Yield Strength ≥525 MPa (34 tons/sq in, converted) Not specified
Elongation ≥22% Not specified
Hardness 201-255 HB Not specified
Condition Hardened and tempered R, ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN100D
Not documented
SAE J404 8740
Chemistry-only alloy steel grade; see the composition notes for product scope
Can BS 970 EN100D Be Substituted With SAE J404 8740?
BS 970 EN100D and SAE J404 8740 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.
On M-EX Right Now
BS 970 EN100D
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SAE J404 8740
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Frequently Asked Questions
What is the difference between BS 970 EN100D and SAE J404 8740?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN100D be substituted with SAE J404 8740?
BS 970 EN100D and SAE J404 8740 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.