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JIS G4801 SUP10 vs BS 970 EN48

Close Alternative — 78% match based on chemical composition and mechanical property overlap.

JIS G4801 SUP10 (JIS G 4801:2005) and BS 970 EN48 (BS 970:1955) are both steel grades. Both fall under the Spring Steel category. JIS G4801 SUP10 is typically used for valve springs, high stress coil springs, torsion springs, while BS 970 EN48 is commonly used for high duty springs, valve springs. JIS G4801 SUP10 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 EN48 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4801 SUP10 vs BS 970 EN48 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 close alternative overall at 78%.

Frequently Compared With JIS G4801 SUP10:
IS 3431 50Cr4V2 EN 10089 55Si7 EN 10089 50CrV4 EN 10089 55Cr3 EN 10083-3 51CrV4 GB/T 1222 55CrMnA EN 10083-1 51CrV4 IS 3195 113C6 IS 3195 50Cr4V2 EN 10083-1 51CrV4 IS 3195 52Cr4Mo2V IS 1570 (Part 4) 55Si7
Match Breakdown
CHEMISTRY MATCH
78%
MECHANICAL MATCH
No shared data
OVERALL
78%
Specifications
Property JIS G4801 SUP10 BS 970 EN48
Standard JIS G 4801:2005 BS 970:1955
Category Spring Steel Spring Steel
C (%) 0.47–0.55 0.45-0.55
Si (%) 0.15–0.35 0.10-0.50
Mn (%) 0.65–0.95 0.50-0.80
Cr (%) 0.80–1.10 1.00-1.40
V (%) 0.15–0.25 Not specified
P (%) ≤0.030 <=0.050
S (%) ≤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 SUP10 BS 970 EN48
Tensile Strength ≥1180 MPa Not specified
Yield Strength ≥1030 MPa Not specified
Elongation ≥7% Not specified
Hardness 363–429 HB Not specified
Typical Applications
JIS G4801 SUP10
Valve springs, high stress coil springs, torsion springs
BS 970 EN48
High duty springs, valve springs
Key Differences
Can JIS G4801 SUP10 Be Substituted With BS 970 EN48?
JIS G4801 SUP10 and BS 970 EN48 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 G4801 SUP10
Round Bar → (3 listings)
Diameter: 30–30 mm (1.18–1.18 in)
Length: 5100–5900 mm (200.79–232.28 in)
BS 970 EN48
Flat Bar → (3 listings)
Thickness: 30–30 mm (1.18–1.18 in)
Width: 150–150 mm (5.91–5.91 in)
Length: 2500–2800 mm (98.43–110.24 in)
On M-EX Right Now
JIS G4801 SUP10
3 active listings and RFQs →
BS 970 EN48
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4801 SUP10 and BS 970 EN48?
JIS G4801 SUP10 specifies V which is not specified for BS 970 EN48.
Can JIS G4801 SUP10 be substituted with BS 970 EN48?
JIS G4801 SUP10 and BS 970 EN48 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.