Post Stock Login Register

SAE J404 E4340 vs AISI 4340

Strong Match — 94.9% match based on chemical composition and mechanical property overlap.

SAE J404 E4340 (SAE J404:2000) and AISI 4340 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 AISI 4340 is commonly used for aircraft parts, heavy duty gears, crankshafts, high tensile bolts. SAE J404 E4340 is defined under SAE International, originating from United States, while AISI 4340 is defined under AISI, originating from United States.

As per chemical composition, SAE J404 E4340 vs AISI 4340 is a 94.9% 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 94.9%.

Frequently Compared With SAE J404 E4340:
IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 11169 (Part 1) 10Ni5Cr4 UNI 11234 100Cr6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
94.9%
MECHANICAL MATCH
No shared data
OVERALL
94.9%
Specifications
Property SAE J404 E4340 AISI 4340
Standard SAE J404:2000 AISI
Category Alloy Steel Alloy Steel
C (%) 0.38-0.43 0.38–0.43
Cr (%) 0.70-0.90 0.70–0.90
Mn (%) 0.65-0.85 0.60–0.80
Mo (%) 0.20-0.30 0.20–0.30
Ni (%) 1.65-2.00 1.65–2.00
P (%) <=0.025 Not specified
S (%) <=0.025 Not specified
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 AISI 4340
Condition Not specified Quenched & Tempered
Tensile Strength Not specified 1000–1200 MPa
Yield Strength Not specified ≥830 MPa
Elongation Not specified ≥12%
Hardness Not specified 285–341 HB
Typical Applications
SAE J404 E4340
Chemistry-only alloy steel grade; see the composition notes for product scope
AISI 4340
Aircraft parts, heavy duty gears, crankshafts, high tensile bolts
Key Differences
Can SAE J404 E4340 Be Substituted With AISI 4340?
SAE J404 E4340 and AISI 4340 overlap closely enough on chemistry and mechanical properties that AISI 4340 is often considered as a substitute for SAE J404 E4340 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 E4340
No active listings currently.
AISI 4340
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5900–6800 mm (232.28–267.72 in)
On M-EX Right Now
SAE J404 E4340
0 active listings and RFQs →
AISI 4340
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between SAE J404 E4340 and AISI 4340?
SAE J404 E4340 specifies P, S which are not specified for AISI 4340.
Can SAE J404 E4340 be substituted with AISI 4340?
SAE J404 E4340 and AISI 4340 overlap closely enough on chemistry and mechanical properties that AISI 4340 is often considered as a substitute for SAE J404 E4340 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.