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JIS G4051 S20C vs SAE J403 1021

Strong Match — 87.7% match based on chemical composition and mechanical property overlap.

JIS G4051 S20C (JIS G4051:2009) and SAE J403 1021 (SAE J403:2001) 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 SAE J403 1021 is commonly used for chemistry-only grade; product scope as listed in the composition notes. JIS G4051 S20C is defined under Japanese Industrial Standards (JIS), originating from Japan, while SAE J403 1021 is defined under SAE International, originating from United States.

As per chemical composition, JIS G4051 S20C vs SAE J403 1021 is a 87.7% 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 87.7%.

Frequently Compared With JIS G4051 S20C:
BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 BS 970 (Part 3) 045A10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 3) 070M20
Match Breakdown
CHEMISTRY MATCH
87.7%
MECHANICAL MATCH
No shared data
OVERALL
87.7%
Specifications
Property JIS G4051 S20C SAE J403 1021
Standard JIS G4051:2009 SAE J403:2001
Category Carbon Steel Carbon Steel
C (%) 0.18-0.23 0.18-0.23
Si (%) 0.15-0.35 Not specified
Mn (%) 0.30-0.60 0.60-0.90
S (%) <=0.035 <=0.050
P (%) <=0.030 <=0.030
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 SAE J403 1021
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
SAE J403 1021
Chemistry-only grade; product scope as listed in the composition notes
Key Differences
Can JIS G4051 S20C Be Substituted With SAE J403 1021?
JIS G4051 S20C and SAE J403 1021 overlap closely enough on chemistry and mechanical properties that SAE J403 1021 is often considered as a substitute for JIS G4051 S20C 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
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)
SAE J403 1021
No active listings currently.
On M-EX Right Now
JIS G4051 S20C
5 active listings and RFQs →
SAE J403 1021
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4051 S20C and SAE J403 1021?
JIS G4051 S20C specifies Si which is not specified for SAE J403 1021.
Can JIS G4051 S20C be substituted with SAE J403 1021?
JIS G4051 S20C and SAE J403 1021 overlap closely enough on chemistry and mechanical properties that SAE J403 1021 is often considered as a substitute for JIS G4051 S20C in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.