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SAE J404 4320 vs JIS G4103 SNCM420

Strong Match — 86.2% match based on chemical composition and mechanical property overlap.

SAE J404 4320 (SAE J404:2000) and JIS G4103 SNCM420 (JIS G4103:1979) are both steel grades. Both fall under the Alloy Steel category. SAE J404 4320 is typically used for chemistry-only alloy steel grade; see the composition notes for product scope, while JIS G4103 SNCM420 is commonly used for used in automotive gears, transmission parts, shafts, pinions, camshafts, and industrial equipment.. SAE J404 4320 is defined under SAE International, originating from United States, while JIS G4103 SNCM420 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, SAE J404 4320 vs JIS G4103 SNCM420 is a 86.2% 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 86.2%.

Frequently Compared With SAE J404 4320:
IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 11169 (Part 1) 10Ni5Cr4 IS 1570 (Part 4) 103Cr4 UNI 11234 100Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Mo6H IS 4367 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
86.2%
MECHANICAL MATCH
No shared data
OVERALL
86.2%
Specifications
Property SAE J404 4320 JIS G4103 SNCM420
Standard SAE J404:2000 JIS G4103:1979
Category Alloy Steel Alloy Steel
C (%) 0.17-0.22 0.17-0.23
Cr (%) 0.40-0.60 0.40-0.80
Mn (%) 0.45-0.65 0.40-0.70
Mo (%) 0.20-0.30 0.15-0.30
Ni (%) 1.65-2.00 1.50-2.00
P (%) <=0.030 0.030 max
S (%) <=0.040 0.030 max
Si (%) 0.15-0.35 0.15-0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property SAE J404 4320 JIS G4103 SNCM420
Tensile Strength Not specified 780-930 MPa
Yield Strength Not specified 590 MPa min
Elongation Not specified 14% min
Hardness Not specified 217-269 HB
Typical Applications
SAE J404 4320
Chemistry-only alloy steel grade; see the composition notes for product scope
JIS G4103 SNCM420
Used in automotive gears, transmission parts, shafts, pinions, camshafts, and industrial equipment.
Can SAE J404 4320 Be Substituted With JIS G4103 SNCM420?
SAE J404 4320 and JIS G4103 SNCM420 overlap closely enough on chemistry and mechanical properties that JIS G4103 SNCM420 is often considered as a substitute for SAE J404 4320 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 4320
No active listings currently.
JIS G4103 SNCM420
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5900–6000 mm (232.28–236.22 in)
On M-EX Right Now
SAE J404 4320
0 active listings and RFQs →
JIS G4103 SNCM420
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between SAE J404 4320 and JIS G4103 SNCM420?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can SAE J404 4320 be substituted with JIS G4103 SNCM420?
SAE J404 4320 and JIS G4103 SNCM420 overlap closely enough on chemistry and mechanical properties that JIS G4103 SNCM420 is often considered as a substitute for SAE J404 4320 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.