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AISI 4140 vs SAE J404 4142

Strong Match — 93.4% match based on chemical composition and mechanical property overlap.

AISI 4140 and SAE J404 4142 (SAE J404:2009) are both steel grades. Both fall under the Alloy Steel category. AISI 4140 is typically used for gears, shafts, dies, bolts, crankshafts, tooling, while SAE J404 4142 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope. AISI 4140 is defined under AISI, originating from United States, while SAE J404 4142 is defined under SAE International, originating from United States.

As per chemical composition, AISI 4140 vs SAE J404 4142 is a 93.4% 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 93.4%.

Frequently Compared With AISI 4140:
GOST 4543 12HN3A NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
93.4%
MECHANICAL MATCH
No shared data
OVERALL
93.4%
Specifications
Property AISI 4140 SAE J404 4142
Standard AISI SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.38–0.43 0.40-0.45
Mn (%) 0.75–1.00 0.75-1.00
Cr (%) 0.80–1.10 0.80-1.10
Mo (%) 0.15–0.25 0.15-0.25
Si (%) 0.15–0.35 0.15-0.35
S (%) ≤0.040 <=0.040
P (%) ≤0.035 <=0.030
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AISI 4140 SAE J404 4142
Condition Quenched & Tempered Not specified
Tensile Strength 850–1000 MPa Not specified
Yield Strength ≥680 MPa Not specified
Elongation ≥13% Not specified
Hardness 248–302 HB Not specified
Impact (Charpy) ≥54 J Not specified
Typical Applications
AISI 4140
Gears, shafts, dies, bolts, crankshafts, tooling
SAE J404 4142
Chemistry-only alloy steel grade; see the composition notes for product scope
Can AISI 4140 Be Substituted With SAE J404 4142?
AISI 4140 and SAE J404 4142 overlap closely enough on chemistry and mechanical properties that SAE J404 4142 is often considered as a substitute for AISI 4140 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 4140
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5800–7000 mm (228.35–275.59 in)
SAE J404 4142
No active listings currently.
On M-EX Right Now
AISI 4140
3 active listings and RFQs →
SAE J404 4142
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between AISI 4140 and SAE J404 4142?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can AISI 4140 be substituted with SAE J404 4142?
AISI 4140 and SAE J404 4142 overlap closely enough on chemistry and mechanical properties that SAE J404 4142 is often considered as a substitute for AISI 4140 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.