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AISI 5120 vs SAE J404 5120

Strong Match — 98.3% match based on chemical composition and mechanical property overlap.

AISI 5120 and SAE J404 5120 (SAE J404:2009) are both steel grades. Both fall under the Alloy Steel category. AISI 5120 is typically used for case hardened gears, pins, shafts, cams, while SAE J404 5120 is commonly used for case hardened gears, pins, shafts, cams, automotive transmission parts. AISI 5120 is defined under AISI, originating from United States, while SAE J404 5120 is defined under SAE International, originating from United States.

As per chemical composition, AISI 5120 vs SAE J404 5120 is a 98.3% 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 98.3%.

Frequently Compared With AISI 5120:
GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A UNI 11234 100Cr6 NF A35-565 100C6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4
Match Breakdown
CHEMISTRY MATCH
98.3%
MECHANICAL MATCH
No shared data
OVERALL
98.3%
Specifications
Property AISI 5120 SAE J404 5120
Standard AISI SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.17–0.22 0.17-0.22
Mn (%) 0.70–0.90 0.70-0.90
Cr (%) 0.70–0.90 0.70-0.90
Si (%) 0.15–0.35 0.15-0.35
P (%) Not specified <=0.030
S (%) Not specified <=0.040
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AISI 5120 SAE J404 5120
Condition Carburized & Case Hardened Not specified
Tensile Strength 750–950 MPa Not specified
Case Hardness HRC 58–62 Not specified
Core Hardness HB 207–269 Not specified
Typical Applications
AISI 5120
Case hardened gears, pins, shafts, cams
SAE J404 5120
Case hardened gears, pins, shafts, cams, automotive transmission parts
Key Differences
Can AISI 5120 Be Substituted With SAE J404 5120?
AISI 5120 and SAE J404 5120 overlap closely enough on chemistry and mechanical properties that SAE J404 5120 is often considered as a substitute for AISI 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
AISI 5120
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5100–6500 mm (200.79–255.91 in)
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)
On M-EX Right Now
AISI 5120
2 active listings and RFQs →
SAE J404 5120
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 5120 and SAE J404 5120?
SAE J404 5120 specifies P, S which are not specified for AISI 5120.
Can AISI 5120 be substituted with SAE J404 5120?
AISI 5120 and SAE J404 5120 overlap closely enough on chemistry and mechanical properties that SAE J404 5120 is often considered as a substitute for AISI 5120 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.