BO2 Steel — Specifications & Listings
BS4659 — British oil hardening cold work tool steel
Grade Details
| Grade | BO2 |
| Standard | BS4659 |
| Description | British oil hardening cold work tool steel |
| Applications | Taps, drills, reamers, punches, gauges |
Equivalent / Similar Grades
Chemical Composition (%)
| C |
Mn |
Cr |
Si |
| 0.85–0.95 |
1.40–1.80 |
≤0.30 |
≤0.30 |
Mechanical Properties
| Hardness HRC (hardened) |
57–62 |
| Hardness HB (annealed) |
≤217 |
Typical Available Sizes
| Round Bar |
8mm–150mm dia |
| Flat Bar |
10×5mm–150×30mm |
Sizes are indicative. Contact seller for exact availability.
Active BO2 Listings on M-EX