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JIS G4103 SNCM439 vs SAE J404 E4340

Close Alternative — 84.6% match based on chemical composition and mechanical property overlap.

JIS G4103 SNCM439 (JIS G4103:1979) and SAE J404 E4340 (SAE J404:2000) are both steel grades. Both fall under the Alloy Steel category. JIS G4103 SNCM439 is typically used for crankshafts, gears, heavy duty shafts, aircraft components, while SAE J404 E4340 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope. JIS G4103 SNCM439 is defined under Japanese Industrial Standards (JIS), originating from Japan, while SAE J404 E4340 is defined under SAE International, originating from United States.

As per chemical composition, JIS G4103 SNCM439 vs SAE J404 E4340 is a 84.6% 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 84.6%.

Frequently Compared With JIS G4103 SNCM439:
GOST 4543 12HN3A NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
84.6%
MECHANICAL MATCH
No shared data
OVERALL
84.6%
Specifications
Property JIS G4103 SNCM439 SAE J404 E4340
Standard JIS G4103:1979 SAE J404:2000
Category Alloy Steel Alloy Steel
C (%) 0.36–0.43 0.38-0.43
Si (%) 0.15–0.35 0.15-0.35
Mn (%) 0.60–0.90 0.65-0.85
Cr (%) 0.60–1.00 0.70-0.90
Mo (%) 0.15–0.30 0.20-0.30
Ni (%) 1.60–2.00 1.65-2.00
P (%) Not specified <=0.025
S (%) Not specified <=0.025
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property JIS G4103 SNCM439 SAE J404 E4340
Tensile Strength ≥980 MPa Not specified
Yield Strength ≥835 MPa Not specified
Elongation ≥12% Not specified
Hardness 293–352 HB Not specified
Typical Applications
JIS G4103 SNCM439
Crankshafts, gears, heavy duty shafts, aircraft components
SAE J404 E4340
Chemistry-only alloy steel grade; see the composition notes for product scope
Key Differences
Can JIS G4103 SNCM439 Be Substituted With SAE J404 E4340?
JIS G4103 SNCM439 and SAE J404 E4340 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
JIS G4103 SNCM439
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4900–5800 mm (192.91–228.35 in)
SAE J404 E4340
No active listings currently.
On M-EX Right Now
JIS G4103 SNCM439
3 active listings and RFQs →
SAE J404 E4340
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4103 SNCM439 and SAE J404 E4340?
SAE J404 E4340 specifies P, S which are not specified for JIS G4103 SNCM439.
Can JIS G4103 SNCM439 be substituted with SAE J404 E4340?
JIS G4103 SNCM439 and SAE J404 E4340 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.