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GOST 4543 40HNMA vs SAE J404 4340

Close Alternative — 77.8% match based on chemical composition and mechanical property overlap.

GOST 4543 40HNMA (GOST 4543-2016) and SAE J404 4340 (SAE J404:2009) are both steel grades. Both fall under the Alloy Steel category. GOST 4543 40HNMA is typically used for used for gears, shafts, spindles, connecting rods, and aerospace parts., while SAE J404 4340 is commonly used for aircraft parts, heavy duty gears, crankshafts. SAE J404 4340 is defined under SAE International (United States).

As per chemical composition, GOST 4543 40HNMA vs SAE J404 4340 is a 77.8% 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 77.8%.

Frequently Compared With GOST 4543 40HNMA:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4
Match Breakdown
CHEMISTRY MATCH
77.8%
MECHANICAL MATCH
No shared data
OVERALL
77.8%
Specifications
Property GOST 4543 40HNMA SAE J404 4340
Standard GOST 4543-2016 SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.38-0.43
Cr (%) 0.6-0.9 0.70-0.90
Ni (%) 1.25-1.65 1.65-2.00
Mo (%) 0.15-0.3 0.20-0.30
Mn (%) 0.5-0.8 0.60-0.80
Si (%) 0.17-0.37 0.15-0.35
P (%) Not specified <=0.030
S (%) Not specified <=0.040
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GOST 4543 40HNMA SAE J404 4340
Tensile Strength 930-1180 MPa Not specified
Yield Strength 785 MPa min Not specified
Elongation 12% min Not specified
Hardness 269-341 HB Not specified
Typical Applications
GOST 4543 40HNMA
Used for gears, shafts, spindles, connecting rods, and aerospace parts.
SAE J404 4340
Aircraft parts, heavy duty gears, crankshafts
Key Differences
Can GOST 4543 40HNMA Be Substituted With SAE J404 4340?
GOST 4543 40HNMA and SAE J404 4340 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
GOST 4543 40HNMA
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6000–6000 mm (236.22–236.22 in)
SAE J404 4340
Round Bar → (25 listings)
Diameter: 50–100 mm (1.97–3.94 in)
Length: 3800–7000 mm (149.61–275.59 in)
Forging → (4 listings)
Diameter: 150–200 mm (5.91–7.87 in)
Length: 500–1500 mm (19.69–59.06 in)
Flat Bar → (3 listings)
Thickness: 30–30 mm (1.18–1.18 in)
Width: 120–120 mm (4.72–4.72 in)
Length: 2500–3000 mm (98.43–118.11 in)
On M-EX Right Now
GOST 4543 40HNMA
2 active listings and RFQs →
SAE J404 4340
32 active listings and RFQs →
Frequently Asked Questions
What is the difference between GOST 4543 40HNMA and SAE J404 4340?
SAE J404 4340 specifies P, S which are not specified for GOST 4543 40HNMA.
Can GOST 4543 40HNMA be substituted with SAE J404 4340?
GOST 4543 40HNMA and SAE J404 4340 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.