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JIS G4051 S40C vs BS 970 (Part 1) 040A12

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

JIS G4051 S40C (JIS G4051:2009) and BS 970 (Part 1) 040A12 (BS 970 (Part 1):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 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two). JIS G4051 S40C is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 1) 040A12 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4051 S40C vs BS 970 (Part 1) 040A12 is a 78% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With JIS G4051 S40C:
BS 970 (Part 1) 040A10 BS 970 (Part 3) 070M55 BS 970 (Part 1) 080A20 BS 970 (Part 1) 040A04 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
78%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property JIS G4051 S40C BS 970 (Part 1) 040A12
Standard JIS G4051:2009 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.37-0.43 0.10-0.15
Si (%) 0.15-0.35 Not specified
Mn (%) 0.60-0.90 0.30-0.50
S (%) <=0.035 Not specified
P (%) <=0.030 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 JIS G4051 S40C BS 970 (Part 1) 040A12
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 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can JIS G4051 S40C Be Substituted With BS 970 (Part 1) 040A12?
JIS G4051 S40C and BS 970 (Part 1) 040A12 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
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 1) 040A12
No active listings currently.
On M-EX Right Now
JIS G4051 S40C
3 active listings and RFQs →
BS 970 (Part 1) 040A12
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Frequently Asked Questions
What is the difference between JIS G4051 S40C and BS 970 (Part 1) 040A12?
JIS G4051 S40C specifies Si, S, P which are not specified for BS 970 (Part 1) 040A12.
Can JIS G4051 S40C be substituted with BS 970 (Part 1) 040A12?
JIS G4051 S40C and BS 970 (Part 1) 040A12 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.