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BS 970 EN45A vs JIS G4801 SUP6

Strong Match — 91.7% match based on chemical composition and mechanical property overlap.

BS 970 EN45A (BS 970:1955) and JIS G4801 SUP6 (JIS G 4801:2005) are both steel grades. Both fall under the Spring Steel category. BS 970 EN45A is defined under British Standards (BS), originating from United Kingdom, while JIS G4801 SUP6 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, BS 970 EN45A vs JIS G4801 SUP6 is a 91.7% 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 91.7%.

Frequently Compared With BS 970 EN45A:
IS 3195 60Si7 IS 1570 (Part 4) 60Si7 IS 3431 60Si7 EN 10089 55Si7 IS 3195 113C6 IS 3431 50Cr4V2 EN 10089 50CrV4 EN 10083-1 51CrV4 EN 10083-3 51CrV4 IS 3195 50Cr4V2 EN 10083-1 51CrV4 IS 1570 (Part 4) 55Si7
Match Breakdown
CHEMISTRY MATCH
91.7%
MECHANICAL MATCH
No shared data
OVERALL
91.7%
Specifications
Property BS 970 EN45A JIS G4801 SUP6
Standard BS 970:1955 JIS G 4801:2005
Category Spring Steel Spring Steel
C (%) 0.55-0.65 0.56–0.64
Si (%) 1.70-2.00 1.50–1.80
Mn (%) 0.70-1.00 0.70–1.00
S (%) <=0.050 ≤0.030
P (%) <=0.050 ≤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 BS 970 EN45A JIS G4801 SUP6
Tensile Strength Not specified ≥1130 MPa
Yield Strength Not specified ≥980 MPa
Elongation Not specified ≥7%
Hardness Not specified 341–415 HB
Typical Applications
BS 970 EN45A
Not documented
JIS G4801 SUP6
Automotive suspension springs, leaf springs
Can BS 970 EN45A Be Substituted With JIS G4801 SUP6?
BS 970 EN45A and JIS G4801 SUP6 overlap closely enough on chemistry and mechanical properties that JIS G4801 SUP6 is often considered as a substitute for BS 970 EN45A 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
BS 970 EN45A
No active listings currently.
JIS G4801 SUP6
Round Bar → (2 listings)
Diameter: 30–30 mm (1.18–1.18 in)
Length: 4500–5700 mm (177.17–224.41 in)
On M-EX Right Now
BS 970 EN45A
0 active listings and RFQs →
JIS G4801 SUP6
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN45A and JIS G4801 SUP6?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN45A be substituted with JIS G4801 SUP6?
BS 970 EN45A and JIS G4801 SUP6 overlap closely enough on chemistry and mechanical properties that JIS G4801 SUP6 is often considered as a substitute for BS 970 EN45A in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.