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BS 970 (Part 1) 708A37 vs BS 970 (Part 1) 708M40

Strong Match — 91.9% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 708A37 (BS 970 (Part 1):1983) and BS 970 (Part 1) 708M40 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 708A37 is typically used for used for gears, shafts, studs, machine spindles, crankshafts, and automotive components., while BS 970 (Part 1) 708M40 is commonly used for used for axles, gears, shafts, studs, crankshafts, and heavy-duty machinery parts.. BS 970 (Part 1) 708A37 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 708M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 (Part 1) 708A37 vs BS 970 (Part 1) 708M40 is a 91.9% 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 91.9%.

Frequently Compared With BS 970 (Part 1) 708A37:
UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A NF A35-565 100C6 GOST 4543 12HN3A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
91.9%
MECHANICAL MATCH
No shared data
OVERALL
91.9%
Specifications
Property BS 970 (Part 1) 708A37 BS 970 (Part 1) 708M40
Standard BS 970 (Part 1):1983 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.35-0.40 0.36-0.44
Mn (%) 0.70-0.90 0.70-1.00
P (%) <=0.035 Not specified
S (%) <=0.040 Not specified
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.15-0.25 0.15-0.25
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
BS 970 (Part 1) 708A37
Used for gears, shafts, studs, machine spindles, crankshafts, and automotive components.
BS 970 (Part 1) 708M40
Used for axles, gears, shafts, studs, crankshafts, and heavy-duty machinery parts.
Key Differences
Can BS 970 (Part 1) 708A37 Be Substituted With BS 970 (Part 1) 708M40?
BS 970 (Part 1) 708A37 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 BS 970 (Part 1) 708A37 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
BS 970 (Part 1) 708A37
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6700–7000 mm (263.78–275.59 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
BS 970 (Part 1) 708A37
2 active listings and RFQs →
BS 970 (Part 1) 708M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 (Part 1) 708A37 and BS 970 (Part 1) 708M40?
BS 970 (Part 1) 708A37 specifies P, S which are not specified for BS 970 (Part 1) 708M40.
Can BS 970 (Part 1) 708A37 be substituted with BS 970 (Part 1) 708M40?
BS 970 (Part 1) 708A37 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 BS 970 (Part 1) 708A37 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.