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JIS G4105 SCM435 vs BS 970 (Part 1) 708M40

Close Alternative — 81.6% match based on chemical composition and mechanical property overlap.

JIS G4105 SCM435 (JIS G4105:1979) and BS 970 (Part 1) 708M40 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. JIS G4105 SCM435 is typically used for gears, shafts, high tensile bolts, while BS 970 (Part 1) 708M40 is commonly used for used for axles, gears, shafts, studs, crankshafts, and heavy-duty machinery parts.. JIS G4105 SCM435 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 1) 708M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4105 SCM435 vs BS 970 (Part 1) 708M40 is a 81.6% 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 81.6%.

Frequently Compared With JIS G4105 SCM435:
NF A35-565 100C6 UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6
Match Breakdown
CHEMISTRY MATCH
81.6%
MECHANICAL MATCH
No shared data
OVERALL
81.6%
Specifications
Property JIS G4105 SCM435 BS 970 (Part 1) 708M40
Standard JIS G4105:1979 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.33–0.38 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 JIS G4105 SCM435 BS 970 (Part 1) 708M40
Tensile Strength ≥830 MPa Not specified
Yield Strength ≥685 MPa Not specified
Elongation ≥15% Not specified
Hardness 248–302 HB Not specified
Typical Applications
JIS G4105 SCM435
Gears, shafts, high tensile bolts
BS 970 (Part 1) 708M40
Used for axles, gears, shafts, studs, crankshafts, and heavy-duty machinery parts.
Key Differences
Can JIS G4105 SCM435 Be Substituted With BS 970 (Part 1) 708M40?
JIS G4105 SCM435 and BS 970 (Part 1) 708M40 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
JIS G4105 SCM435
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4600–5300 mm (181.1–208.66 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
JIS G4105 SCM435
2 active listings and RFQs →
BS 970 (Part 1) 708M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4105 SCM435 and BS 970 (Part 1) 708M40?
JIS G4105 SCM435 specifies Si which is not specified for BS 970 (Part 1) 708M40.
Can JIS G4105 SCM435 be substituted with BS 970 (Part 1) 708M40?
JIS G4105 SCM435 and BS 970 (Part 1) 708M40 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.