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BS 4659 BH21 vs JIS G4404 SKD5

Strong Match — 89.5% match based on chemical composition and mechanical property overlap.

BS 4659 BH21 (BS 4659:1989) and JIS G4404 SKD5 (JIS G4404:2006) are both steel grades. Both fall under the Tool & Die Steels category. BS 4659 BH21 is typically used for hot extrusion dies, brass/bronze forging dies, while JIS G4404 SKD5 is commonly used for hot extrusion dies, hot forging tools. BS 4659 BH21 is defined under British Standards (BS), originating from United Kingdom, while JIS G4404 SKD5 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, BS 4659 BH21 vs JIS G4404 SKD5 is a 84.2% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 89.5%.

Frequently Compared With BS 4659 BH21:
GB/T 1299 3Cr2W8V GOST 5950 4H5MFS1 EN ISO 4957 1.2316 GOST 5950 3H2W8F GOST 5950 4H5MFS AISI 52100 EN ISO 683-17 100Cr6 DIN EN ISO 4957 1.2379 DIN EN ISO 4957 1.2344 GB/T 1299 4Cr5MoSiV1 GB/T 1299 4Cr5MoSiV IS 1570 (Part 6) 103T3
Match Breakdown
CHEMISTRY MATCH
84.2%
MECHANICAL MATCH
100%
OVERALL
89.5%
Specifications
Property BS 4659 BH21 JIS G4404 SKD5
Standard BS 4659:1989 JIS G4404:2006
Category Tool & Die Steels Tool & Die Steels
C (%) 0.26–0.36 0.25-0.35
Mn (%) 0.15–0.40 <=0.50
Cr (%) 3.00–3.75 2.50-3.50
W (%) 8.50–10.00 8.00-10.00
V (%) 0.30–0.60 0.30-0.60
Si (%) Not specified <=0.40
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 4659 BH21 JIS G4404 SKD5
Hardness HRC (hardened) 36–54 38-52
Hardness HB (annealed) ≤229 <=229
Typical Applications
BS 4659 BH21
Hot extrusion dies, brass/bronze forging dies
JIS G4404 SKD5
Hot extrusion dies, hot forging tools
Key Differences
Can BS 4659 BH21 Be Substituted With JIS G4404 SKD5?
BS 4659 BH21 and JIS G4404 SKD5 overlap closely enough on chemistry and mechanical properties that JIS G4404 SKD5 is often considered as a substitute for BS 4659 BH21 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 4659 BH21
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 4400–4600 mm (173.23–181.1 in)
JIS G4404 SKD5
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 3200–3500 mm (125.98–137.8 in)
On M-EX Right Now
BS 4659 BH21
2 active listings and RFQs →
JIS G4404 SKD5
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 4659 BH21 and JIS G4404 SKD5?
JIS G4404 SKD5 specifies Si which is not specified for BS 4659 BH21.
Can BS 4659 BH21 be substituted with JIS G4404 SKD5?
BS 4659 BH21 and JIS G4404 SKD5 overlap closely enough on chemistry and mechanical properties that JIS G4404 SKD5 is often considered as a substitute for BS 4659 BH21 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.