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BS 970 (Part 1) 708A42 vs SAE J404 4142

Strong Match — 89.6% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 708A42 (BS 970 (Part 1):1983) and SAE J404 4142 (SAE J404:2009) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 708A42 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 J404 4142 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope. BS 970 (Part 1) 708A42 is defined under British Standards (BS), originating from United Kingdom, while SAE J404 4142 is defined under SAE International, originating from United States.

As per chemical composition, BS 970 (Part 1) 708A42 vs SAE J404 4142 is a 89.6% 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 89.6%.

Frequently Compared With BS 970 (Part 1) 708A42:
NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H IS 11169 (Part 1) 10Ni5Cr4
Match Breakdown
CHEMISTRY MATCH
89.6%
MECHANICAL MATCH
No shared data
OVERALL
89.6%
Specifications
Property BS 970 (Part 1) 708A42 SAE J404 4142
Standard BS 970 (Part 1):1983 SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.40-0.45 0.40-0.45
Mn (%) 0.75-1.00 0.75-1.00
Cr (%) 0.90-1.20 0.80-1.10
Mo (%) 0.15-0.25 0.15-0.25
P (%) <=0.035 <=0.030
S (%) <=0.040 <=0.040
Si (%) Not specified 0.15-0.35
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) 708A42
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
SAE J404 4142
Chemistry-only alloy steel grade; see the composition notes for product scope
Key Differences
Can BS 970 (Part 1) 708A42 Be Substituted With SAE J404 4142?
BS 970 (Part 1) 708A42 and SAE J404 4142 overlap closely enough on chemistry and mechanical properties that SAE J404 4142 is often considered as a substitute for BS 970 (Part 1) 708A42 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
On M-EX Right Now
BS 970 (Part 1) 708A42
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SAE J404 4142
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 708A42 and SAE J404 4142?
SAE J404 4142 specifies Si which is not specified for BS 970 (Part 1) 708A42.
Can BS 970 (Part 1) 708A42 be substituted with SAE J404 4142?
BS 970 (Part 1) 708A42 and SAE J404 4142 overlap closely enough on chemistry and mechanical properties that SAE J404 4142 is often considered as a substitute for BS 970 (Part 1) 708A42 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.