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BS 970 (Part 3) 817M40 vs NF A35-565 100C6

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 817M40 (BS 970 (Part 3):1991) and NF A35-565 100C6 are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 3) 817M40 is typically used for high tensile shafts, gears, crankshafts, while NF A35-565 100C6 is commonly used for ball bearings, roller bearings, bearing races, rollers, precision tools, wear resistant parts. BS 970 (Part 3) 817M40 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 3) 817M40 vs NF A35-565 100C6 is a 57% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With BS 970 (Part 3) 817M40:
GOST 4543 12HN3A UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
57%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property BS 970 (Part 3) 817M40 NF A35-565 100C6
Standard BS 970 (Part 3):1991 NF A35-565
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.95-1.05
Si (%) 0.10-0.40 0.15-0.35
Mn (%) 0.45-0.70 0.25-0.45
P (%) <=0.035 <=0.027
S (%) <=0.040 <=0.025
Cr (%) 1.00-1.40 1.35-1.65
Mo (%) 0.20-0.35 Not specified
Ni (%) 1.30-1.70 Not specified
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 3) 817M40 NF A35-565 100C6
Tensile Strength Not specified 850-1100 MPa
Hardness Not specified 60-66 HRC
Typical Applications
BS 970 (Part 3) 817M40
High tensile shafts, gears, crankshafts
NF A35-565 100C6
ball bearings, roller bearings, bearing races, rollers, precision tools, wear resistant parts
Key Differences
Can BS 970 (Part 3) 817M40 Be Substituted With NF A35-565 100C6?
BS 970 (Part 3) 817M40 and NF A35-565 100C6 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
BS 970 (Part 3) 817M40
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6200–6500 mm (244.09–255.91 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 3) 817M40
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 3) 817M40 and NF A35-565 100C6?
BS 970 (Part 3) 817M40 specifies Mo, Ni which are not specified for NF A35-565 100C6.
Can BS 970 (Part 3) 817M40 be substituted with NF A35-565 100C6?
BS 970 (Part 3) 817M40 and NF A35-565 100C6 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.