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BS 4659 BO2 vs EN ISO 4957 1.2316

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

BS 4659 BO2 (BS 4659:1989) and EN ISO 4957 1.2316 (EN ISO 4957:2018) 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 EN ISO 4957 1.2316 is commonly used for plastic injection moulds for corrosive materials, food packaging moulds. BS 4659 BO2 is defined under British Standards (BS), originating from United Kingdom, while EN ISO 4957 1.2316 is defined under European Standard (EN), originating from Europe.

As per chemical composition, BS 4659 BO2 vs EN ISO 4957 1.2316 is a 62.2% 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 DIN EN ISO 4957 1.2379 DIN EN ISO 4957 1.2344 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
62.2%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property BS 4659 BO2 EN ISO 4957 1.2316
Standard BS 4659:1989 EN ISO 4957:2018
Category Tool & Die Steels Tool & Die Steels
C (%) 0.85–0.95 ≤0.06
Mn (%) 1.40–1.80 ≤1.00
Cr (%) ≤0.30 15.5–17.5
Si (%) ≤0.30 ≤0.50
Mo (%) Not specified 0.80–1.30
Ni (%) Not specified 0.80–1.50
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 EN ISO 4957 1.2316
Hardness HRC (hardened) 57–62 38–44
Hardness HB (annealed) ≤217 Not specified
Hardness HRC Not specified 28–34 (pre-hardened)
Corrosion Resistance Not specified Good in humid/corrosive environments
Typical Applications
BS 4659 BO2
Taps, drills, reamers, punches, gauges
EN ISO 4957 1.2316
Plastic injection moulds for corrosive materials, food packaging moulds
Key Differences
Can BS 4659 BO2 Be Substituted With EN ISO 4957 1.2316?
BS 4659 BO2 and EN ISO 4957 1.2316 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)
EN ISO 4957 1.2316
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 2600–2700 mm (102.36–106.3 in)
On M-EX Right Now
BS 4659 BO2
2 active listings and RFQs →
EN ISO 4957 1.2316
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 4659 BO2 and EN ISO 4957 1.2316?
EN ISO 4957 1.2316 specifies Mo, Ni which are not specified for BS 4659 BO2.
Can BS 4659 BO2 be substituted with EN ISO 4957 1.2316?
BS 4659 BO2 and EN ISO 4957 1.2316 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.