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BS 4659 BO2 vs AISI 52100

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

BS 4659 BO2 (BS 4659:1989) and AISI 52100 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 AISI 52100 is commonly used for anti-friction bearings, ball screws, precision rollers. BS 4659 BO2 is defined under British Standards (BS), originating from United Kingdom, while AISI 52100 is defined under AISI, originating from United States.

As per chemical composition, BS 4659 BO2 vs AISI 52100 is a 73.8% 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 EN ISO 4957 1.2316 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
73.8%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property BS 4659 BO2 AISI 52100
Standard BS 4659:1989 AISI
Category Tool & Die Steels Tool & Die Steels
C (%) 0.85–0.95 0.93–1.05
Mn (%) 1.40–1.80 0.25–0.45
Cr (%) ≤0.30 1.35–1.60
Si (%) ≤0.30 0.15–0.35
S (%) Not specified ≤0.025
P (%) Not specified ≤0.025
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 AISI 52100
Hardness HRC (hardened) 57–62 Not specified
Hardness HB (annealed) ≤217 Not specified
Tensile Strength Not specified ≥620 MPa (annealed)
Hardness HRC Not specified 60–66 (hardened)
Hardness HB Not specified 179–229 (annealed)
Typical Applications
BS 4659 BO2
Taps, drills, reamers, punches, gauges
AISI 52100
Anti-friction bearings, ball screws, precision rollers
Key Differences
Can BS 4659 BO2 Be Substituted With AISI 52100?
BS 4659 BO2 and AISI 52100 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)
AISI 52100
Round Bar → (3 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 3000–3200 mm (118.11–125.98 in)
On M-EX Right Now
BS 4659 BO2
2 active listings and RFQs →
AISI 52100
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 4659 BO2 and AISI 52100?
AISI 52100 specifies S, P which are not specified for BS 4659 BO2.
Can BS 4659 BO2 be substituted with AISI 52100?
BS 4659 BO2 and AISI 52100 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.