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SAE J404 5120 vs BS 970 (Part 1) 527A17

Strong Match — 87.4% match based on chemical composition and mechanical property overlap.

SAE J404 5120 (SAE J404:2009) and BS 970 (Part 1) 527A17 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. SAE J404 5120 is typically used for case hardened gears, pins, shafts, cams, automotive transmission parts, while BS 970 (Part 1) 527A17 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties).. SAE J404 5120 is defined under SAE International, originating from United States, while BS 970 (Part 1) 527A17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, SAE J404 5120 vs BS 970 (Part 1) 527A17 is a 87.4% 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 87.4%.

Frequently Compared With SAE J404 5120:
NF A35-565 100C6 GB/T 3077 12Cr2Ni4A UNI 11234 100Cr6 GOST 4543 12HN3A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
87.4%
MECHANICAL MATCH
No shared data
OVERALL
87.4%
Specifications
Property SAE J404 5120 BS 970 (Part 1) 527A17
Standard SAE J404:2009 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.17-0.22 0.14-0.19
Cr (%) 0.70-0.90 0.70-0.90
Mn (%) 0.70-0.90 0.70-0.90
P (%) <=0.030 <=0.035
S (%) <=0.040 <=0.040
Si (%) 0.15-0.35 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 J404 5120
Case hardened gears, pins, shafts, cams, automotive transmission parts
BS 970 (Part 1) 527A17
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can SAE J404 5120 Be Substituted With BS 970 (Part 1) 527A17?
SAE J404 5120 and BS 970 (Part 1) 527A17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 527A17 is often considered as a substitute for SAE J404 5120 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
SAE J404 5120
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6200–6400 mm (244.09–251.97 in)
BS 970 (Part 1) 527A17
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On M-EX Right Now
SAE J404 5120
2 active listings and RFQs →
BS 970 (Part 1) 527A17
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Frequently Asked Questions
What is the difference between SAE J404 5120 and BS 970 (Part 1) 527A17?
SAE J404 5120 specifies Si which is not specified for BS 970 (Part 1) 527A17.
Can SAE J404 5120 be substituted with BS 970 (Part 1) 527A17?
SAE J404 5120 and BS 970 (Part 1) 527A17 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 527A17 is often considered as a substitute for SAE J404 5120 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.