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JIS G4801 SUP6 vs BS 970 EN42

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

JIS G4801 SUP6 (JIS G 4801:2005) and BS 970 EN42 (BS 970:1955) are both steel grades. Both fall under the Spring Steel category. JIS G4801 SUP6 is typically used for automotive suspension springs, leaf springs, while BS 970 EN42 is commonly used for springs, chisels, punches, cutting tools. JIS G4801 SUP6 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 EN42 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4801 SUP6 vs BS 970 EN42 is a 78.4% 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 G4801 SUP6:
EN 10089 55Si7 EN 10089 55Cr3 EN 10089 50CrV4 EN 10083-3 51CrV4 GB/T 1222 55CrMnA IS 3431 60Si7 IS 1570 (Part 4) 55Si7 IS 1570 (Part 4) 60Si7 IS 1570 (Part 4) 65Si7 IS 3195 113C6 IS 3431 50Cr4V2 BS 970 EN42B
Match Breakdown
CHEMISTRY MATCH
78.4%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property JIS G4801 SUP6 BS 970 EN42
Standard JIS G 4801:2005 BS 970:1955
Category Spring Steel Spring Steel
C (%) 0.56–0.64 0.70-0.85
Si (%) 1.50–1.80 0.10-0.40
Mn (%) 0.70–1.00 0.55-0.75
S (%) ≤0.030 <=0.050
P (%) ≤0.030 <=0.050
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property JIS G4801 SUP6 BS 970 EN42
Tensile Strength ≥1130 MPa Not specified
Yield Strength ≥980 MPa Not specified
Elongation ≥7% Not specified
Hardness 341–415 HB Not specified
Typical Applications
JIS G4801 SUP6
Automotive suspension springs, leaf springs
BS 970 EN42
Springs, chisels, punches, cutting tools
Can JIS G4801 SUP6 Be Substituted With BS 970 EN42?
JIS G4801 SUP6 and BS 970 EN42 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 G4801 SUP6
Round Bar → (2 listings)
Diameter: 30–30 mm (1.18–1.18 in)
Length: 4500–5700 mm (177.17–224.41 in)
BS 970 EN42
Round Bar → (3 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 5200–6900 mm (204.72–271.65 in)
On M-EX Right Now
JIS G4801 SUP6
2 active listings and RFQs →
BS 970 EN42
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4801 SUP6 and BS 970 EN42?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can JIS G4801 SUP6 be substituted with BS 970 EN42?
JIS G4801 SUP6 and BS 970 EN42 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.