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JIS G4051 S40C vs BS 970 (Part 3) 070M55

Close Alternative — 84.9% match based on chemical composition and mechanical property overlap.

JIS G4051 S40C (JIS G4051:2009) and BS 970 (Part 3) 070M55 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Carbon Steel category. JIS G4051 S40C is typically used for shafts, gears, bolts, couplings, machine parts, while BS 970 (Part 3) 070M55 is commonly used for used for springs, blades, wear plates, hand tools, shafts, and cutting components.. JIS G4051 S40C is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 3) 070M55 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4051 S40C vs BS 970 (Part 3) 070M55 is a 86.1% 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 84.9%.

Frequently Compared With JIS G4051 S40C:
BS 970 (Part 1) 040A10 BS 970 (Part 1) 080A20 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 060A32 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15
Match Breakdown
CHEMISTRY MATCH
86.1%
MECHANICAL MATCH
No shared data
OVERALL
84.9%
Specifications
Property JIS G4051 S40C BS 970 (Part 3) 070M55
Standard JIS G4051:2009 BS 970 (Part 3):1991
Category Carbon Steel Carbon Steel
C (%) 0.37-0.43 0.50-0.60
Si (%) 0.15-0.35 0.10-0.40
Mn (%) 0.60-0.90 0.50-0.90
S (%) <=0.035 <=0.05
P (%) <=0.030 <=0.05
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property JIS G4051 S40C BS 970 (Part 3) 070M55
Tensile Strength >=570 MPa Not specified
Yield Strength >=390 MPa Not specified
Elongation >=17% Not specified
Hardness <=179 HB Not specified
Typical Applications
JIS G4051 S40C
Shafts, gears, bolts, couplings, machine parts
BS 970 (Part 3) 070M55
Used for springs, blades, wear plates, hand tools, shafts, and cutting components.
Can JIS G4051 S40C Be Substituted With BS 970 (Part 3) 070M55?
JIS G4051 S40C and BS 970 (Part 3) 070M55 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 G4051 S40C
Round Bar → (3 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 6100–6600 mm (240.16–259.84 in)
BS 970 (Part 3) 070M55
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 4800–5800 mm (188.98–228.35 in)
On M-EX Right Now
JIS G4051 S40C
3 active listings and RFQs →
BS 970 (Part 3) 070M55
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4051 S40C and BS 970 (Part 3) 070M55?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4051 S40C be substituted with BS 970 (Part 3) 070M55?
JIS G4051 S40C and BS 970 (Part 3) 070M55 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.