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NF A35-552 42CD4 vs BS 970 (Part 1) 708M40

Strong Match — 85.7% match based on chemical composition and mechanical property overlap.

NF A35-552 42CD4 (NF A35-552:1986) and BS 970 (Part 1) 708M40 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. NF A35-552 42CD4 is typically used for gears, shafts, crankshafts, high tensile fasteners, while BS 970 (Part 1) 708M40 is commonly used for used for axles, gears, shafts, studs, crankshafts, and heavy-duty machinery parts.. NF A35-552 42CD4 is defined under Association Francaise de Normalisation (NF), originating from France, while BS 970 (Part 1) 708M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, NF A35-552 42CD4 vs BS 970 (Part 1) 708M40 is a 85.7% 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 85.7%.

Frequently Compared With NF A35-552 42CD4:
GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
85.7%
MECHANICAL MATCH
No shared data
OVERALL
85.7%
Specifications
Property NF A35-552 42CD4 BS 970 (Part 1) 708M40
Standard NF A35-552:1986 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.38–0.45 0.36-0.44
Si (%) 0.15–0.35 Not specified
Mn (%) 0.60–0.90 0.70-1.00
Cr (%) 0.90–1.20 0.90-1.20
Mo (%) 0.15–0.30 0.15-0.25
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property NF A35-552 42CD4 BS 970 (Part 1) 708M40
Tensile Strength 900–1100 MPa Not specified
Yield Strength ≥700 MPa Not specified
Elongation ≥12% Not specified
Hardness 263–313 HB Not specified
Typical Applications
NF A35-552 42CD4
Gears, shafts, crankshafts, high tensile fasteners
BS 970 (Part 1) 708M40
Used for axles, gears, shafts, studs, crankshafts, and heavy-duty machinery parts.
Key Differences
Can NF A35-552 42CD4 Be Substituted With BS 970 (Part 1) 708M40?
NF A35-552 42CD4 and BS 970 (Part 1) 708M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708M40 is often considered as a substitute for NF A35-552 42CD4 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
NF A35-552 42CD4
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5900–6800 mm (232.28–267.72 in)
BS 970 (Part 1) 708M40
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5700–6000 mm (224.41–236.22 in)
On M-EX Right Now
NF A35-552 42CD4
3 active listings and RFQs →
BS 970 (Part 1) 708M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between NF A35-552 42CD4 and BS 970 (Part 1) 708M40?
NF A35-552 42CD4 specifies Si which is not specified for BS 970 (Part 1) 708M40.
Can NF A35-552 42CD4 be substituted with BS 970 (Part 1) 708M40?
NF A35-552 42CD4 and BS 970 (Part 1) 708M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708M40 is often considered as a substitute for NF A35-552 42CD4 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.