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BS 4659 BO2 vs DIN EN ISO 4957 1.2344

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

BS 4659 BO2 (BS 4659:1989) and DIN EN ISO 4957 1.2344 (DIN EN ISO 4957:2018-11) are both steel grades. Both fall under the Tool & Die Steels category. BS 4659 BO2 is typically used for taps, drills, reamers, punches, gauges, while DIN EN ISO 4957 1.2344 is commonly used for die casting dies, extrusion dies, forging dies, hot shear blades, mandrels, pressure die casting tooling. BS 4659 BO2 is defined under British Standards (BS), originating from United Kingdom, while DIN EN ISO 4957 1.2344 is defined under European Standard (EN), originating from Europe.

As per chemical composition, BS 4659 BO2 vs DIN EN ISO 4957 1.2344 is a 59.5% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With BS 4659 BO2:
GOST 5950 4H5MFS1 EN ISO 683-17 100Cr6 AISI 52100 EN ISO 4957 1.2316 DIN EN ISO 4957 1.2379 GB/T 1299 3Cr2W8V GOST 5950 3H2W8F GB/T 1299 4Cr5MoSiV GOST 5950 4H5MFS GB/T 1299 4Cr5MoSiV1 IS 1570 (Part 6) 55T8 IS 1570 (Part 6) 50T8
Match Breakdown
CHEMISTRY MATCH
59.5%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property BS 4659 BO2 DIN EN ISO 4957 1.2344
Standard BS 4659:1989 DIN EN ISO 4957:2018-11
Category Tool & Die Steels Tool & Die Steels
C (%) 0.85–0.95 0.37–0.43
Mn (%) 1.40–1.80 0.30–0.50
Cr (%) ≤0.30 4.80–5.50
Si (%) ≤0.30 0.90–1.20
Mo (%) Not specified 1.20–1.50
V (%) Not specified 0.90–1.10
S (%) Not specified ≤0.030
P (%) Not specified ≤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 4659 BO2 DIN EN ISO 4957 1.2344
Hardness HRC (hardened) 57–62 Not specified
Hardness HB (annealed) ≤217 Not specified
Hardness (annealed) Not specified ≤229 HB
Hardness (hardened) Not specified 44–52 HRC
Tensile Strength Not specified 1200–1600 MPa
Elongation Not specified ≥8%
Typical Applications
BS 4659 BO2
Taps, drills, reamers, punches, gauges
DIN EN ISO 4957 1.2344
Die casting dies, extrusion dies, forging dies, hot shear blades, mandrels, pressure die casting tooling
Key Differences
Can BS 4659 BO2 Be Substituted With DIN EN ISO 4957 1.2344?
BS 4659 BO2 and DIN EN ISO 4957 1.2344 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
BS 4659 BO2
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 3100–3500 mm (122.05–137.8 in)
DIN EN ISO 4957 1.2344
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 3000–3700 mm (118.11–145.67 in)
On M-EX Right Now
BS 4659 BO2
2 active listings and RFQs →
DIN EN ISO 4957 1.2344
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 4659 BO2 and DIN EN ISO 4957 1.2344?
DIN EN ISO 4957 1.2344 specifies Mo, V, S, P which are not specified for BS 4659 BO2.
Can BS 4659 BO2 be substituted with DIN EN ISO 4957 1.2344?
BS 4659 BO2 and DIN EN ISO 4957 1.2344 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.