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JIS G4051 S20C vs BS 970 (Part 1) 040A12

Close Alternative — 81.8% match based on chemical composition and mechanical property overlap.

JIS G4051 S20C (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 S20C is typically used for shafts, pins, keys, lightly stressed components, while BS 970 (Part 1) 040A12 is commonly used for as-rolled, or as-rolled and softened, steel (section two). JIS G4051 S20C 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 S20C vs BS 970 (Part 1) 040A12 is a 81.8% 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 81.8%.

Frequently Compared With JIS G4051 S20C:
BS 970 (Part 3) 070M55 BS 970 (Part 1) 080A20 BS 970 (Part 1) 040A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 3) 070M20 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045M10
Match Breakdown
CHEMISTRY MATCH
81.8%
MECHANICAL MATCH
No shared data
OVERALL
81.8%
Specifications
Property JIS G4051 S20C BS 970 (Part 1) 040A12
Standard JIS G4051:2009 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.18-0.23 0.10-0.15
Si (%) 0.15-0.35 Not specified
Mn (%) 0.30-0.60 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 S20C BS 970 (Part 1) 040A12
Tensile Strength >=440 MPa Not specified
Elongation >=23% Not specified
Hardness <=149 HB Not specified
Typical Applications
JIS G4051 S20C
Shafts, pins, keys, lightly stressed components
BS 970 (Part 1) 040A12
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can JIS G4051 S20C Be Substituted With BS 970 (Part 1) 040A12?
JIS G4051 S20C and BS 970 (Part 1) 040A12 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 S20C
Round Bar → (5 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 5700–7000 mm (224.41–275.59 in)
BS 970 (Part 1) 040A12
No active listings currently.
On M-EX Right Now
JIS G4051 S20C
5 active listings and RFQs →
BS 970 (Part 1) 040A12
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4051 S20C and BS 970 (Part 1) 040A12?
JIS G4051 S20C specifies Si, S, P which are not specified for BS 970 (Part 1) 040A12.
Can JIS G4051 S20C be substituted with BS 970 (Part 1) 040A12?
JIS G4051 S20C and BS 970 (Part 1) 040A12 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.