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SAE J404 E4340 vs JIS G4103 SNCM240

Close Alternative — 83.4% match based on chemical composition and mechanical property overlap.

SAE J404 E4340 (SAE J404:2009) and JIS G4103 SNCM240 (JIS G4103:1979) are both steel grades. Both fall under the Alloy Steel category. SAE J404 E4340 is typically used for chemistry-only alloy steel grade; see the composition notes for product scope, while JIS G4103 SNCM240 is commonly used for used in gears, shafts, axles, crankshafts, bolts, and machine tool components.. SAE J404 E4340 is defined under SAE International, originating from United States, while JIS G4103 SNCM240 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, SAE J404 E4340 vs JIS G4103 SNCM240 is a 83.4% 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 83.4%.

Frequently Compared With SAE J404 E4340:
IS 1570 (Part 4) 103Cr4 IS 11169 (Part 1) 10Ni5Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Mo6H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6
Match Breakdown
CHEMISTRY MATCH
83.4%
MECHANICAL MATCH
No shared data
OVERALL
83.4%
Specifications
Property SAE J404 E4340 JIS G4103 SNCM240
Standard SAE J404:2009 JIS G4103:1979
Category Alloy Steel Alloy Steel
C (%) 0.38-0.43 0.37-0.43
Cr (%) 0.70-0.90 0.40-0.80
Mn (%) 0.65-0.85 0.60-0.90
Mo (%) 0.20-0.30 0.15-0.30
Ni (%) 1.65-2.00 1.50-2.00
P (%) <=0.025 0.030 max
S (%) <=0.025 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 E4340 JIS G4103 SNCM240
Tensile Strength Not specified 850-1000 MPa
Yield Strength Not specified 685 MPa min
Elongation Not specified 13% min
Hardness Not specified 240-300 HB
Typical Applications
SAE J404 E4340
Chemistry-only alloy steel grade; see the composition notes for product scope
JIS G4103 SNCM240
Used in gears, shafts, axles, crankshafts, bolts, and machine tool components.
Can SAE J404 E4340 Be Substituted With JIS G4103 SNCM240?
SAE J404 E4340 and JIS G4103 SNCM240 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.
Forms & Sizes Available on M-EX
SAE J404 E4340
No active listings currently.
JIS G4103 SNCM240
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6600–6700 mm (259.84–263.78 in)
On M-EX Right Now
SAE J404 E4340
0 active listings and RFQs →
JIS G4103 SNCM240
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between SAE J404 E4340 and JIS G4103 SNCM240?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can SAE J404 E4340 be substituted with JIS G4103 SNCM240?
SAE J404 E4340 and JIS G4103 SNCM240 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.