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BS 970 (Part 1) 535A99 vs NF A35-565 100C6

Close Alternative — 80.8% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 535A99 (BS 970 (Part 1):1983) and NF A35-565 100C6 are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 535A99 is typically used for used for aircraft fittings, gears, high-strength shafts, crankshafts, heavy-duty fasteners, and transmission parts., while NF A35-565 100C6 is commonly used for ball bearings, roller bearings, bearing races, rollers, precision tools, wear resistant parts. BS 970 (Part 1) 535A99 is defined under British Standards (BS), originating from United Kingdom, while NF A35-565 100C6 is defined under Association Francaise de Normalisation (NF), originating from France.

As per chemical composition, BS 970 (Part 1) 535A99 vs NF A35-565 100C6 is a 80.8% 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 80.8%.

Frequently Compared With BS 970 (Part 1) 535A99:
UNI 11234 100Cr6 GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
80.8%
MECHANICAL MATCH
No shared data
OVERALL
80.8%
Specifications
Property BS 970 (Part 1) 535A99 NF A35-565 100C6
Standard BS 970 (Part 1):1983 NF A35-565
Category Alloy Steel Alloy Steel
C (%) 0.95-1.10 0.95-1.05
Mn (%) 0.40-0.70 0.25-0.45
P (%) <=0.035 <=0.027
S (%) <=0.040 <=0.025
Cr (%) 1.20-1.60 1.35-1.65
Si (%) Not specified 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 BS 970 (Part 1) 535A99 NF A35-565 100C6
Tensile Strength Not specified 850-1100 MPa
Hardness Not specified 60-66 HRC
Typical Applications
BS 970 (Part 1) 535A99
Used for aircraft fittings, gears, high-strength shafts, crankshafts, heavy-duty fasteners, and transmission parts.
NF A35-565 100C6
ball bearings, roller bearings, bearing races, rollers, precision tools, wear resistant parts
Key Differences
Can BS 970 (Part 1) 535A99 Be Substituted With NF A35-565 100C6?
BS 970 (Part 1) 535A99 and NF A35-565 100C6 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
BS 970 (Part 1) 535A99
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–6400 mm (204.72–251.97 in)
NF A35-565 100C6
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6700–6700 mm (263.78–263.78 in)
On M-EX Right Now
BS 970 (Part 1) 535A99
2 active listings and RFQs →
NF A35-565 100C6
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 1) 535A99 and NF A35-565 100C6?
NF A35-565 100C6 specifies Si which is not specified for BS 970 (Part 1) 535A99.
Can BS 970 (Part 1) 535A99 be substituted with NF A35-565 100C6?
BS 970 (Part 1) 535A99 and NF A35-565 100C6 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.