BB Tool
High Hardness Carbide End Mill | BK2063 & BB2063 | Hardened Steel
High Hardness Carbide End Mill | BK2063 & BB2063 | Hardened Steel
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High-Hardness End Mills | BK2063 & BB2063
Two high-hardness solid carbide flat end mill series engineered for hardened steel and die & mold machining — BB2063 with TiSiN composite coating and BK2063 with unique diamond coating. Same 0.2μm ultra-fine grain carbide substrate, two coatings tuned for different workpiece hardness.
Reading the size options — Ø (cutting diameter) × shank Ø × flute length × overall length, all in mm. Example: 6×6×20×75 = 6 mm cutting diameter, 6 mm shank, 20 mm flute, 75 mm overall. The size chart in the image gallery shows the same four dimensions.
BB2063 substrate & coating
- Geometry: 35° helix
- Grain size: 0.3–0.2 μm
- Recommended hardness range: HRC 45–62
- Coating: upgraded TiSiN composite, hardness > HV 3500, better oxidation resistance and thermal stability than standard TiSiN
Recommended workpiece materials — BK2063
Mold steel and hardened steel above HRC 45. Intended for hardened dies, inserts and heat-treated components, where chipping resistance at the cutting edge is the limiting factor.
Main Features
- 0.2 μm ultra-fine grain carbide substrate — extremely high hardness and toughness, stable edge life in hardened steel up to HRC 62.
- Reinforced tool geometry — edge design optimized for high-hardness cutting, with strict whole-process quality control for consistent performance.
- Two next-generation coatings — TiSiN composite for hardened steels; unique diamond coating (HV 8000+) for extreme hardness and wear resistance.
- 35° / 45° helix angle — BB2063 35° for smooth chip flow; BK2063 45° reinforced edge for high-hardness cutting.
BB2063 — TiSiN Composite Coating
- 4-flute flat end mill, 31 sizes from 1 to 20 mm.
- TiSiN composite coating, microhardness > HV 3500, superior oxidation resistance and thermal stability for high-temperature cutting.
- Best for: hardened steels HRC 45–62, die steels (SKD11, P20, 718, H13, Cr12), welding parts and oxygen-cut materials.
- Rigid core design reduces vibration and deflection — ideal for finish machining of mold cavities.
BK2063 — Diamond Coating
- Available in 4-flute flat (13 sizes) and 2-flute flat (13 sizes), 1–20 mm.
- Unique diamond coating technology, hardness up to HV 8000+ — ultra-low friction and excellent heat dissipation, keeps the edge sharp longer in high-hardness machining.
- 45° helix, reinforced cutting edge for high-hardness steel.
- Best for: pre-hardened and hardened mold steels up to HRC 65, tool steels and abrasive hardened workpieces, fine finishing with light depth of cut.
Cutting Parameters (Reference)
Speeds and feeds by workpiece hardness (HRC 45–50 / 50–55 / 55–60 / 60–65) and cutter diameter. Adjust according to workpiece material and hardness. ap = 1/3D (1/8–1/2D), ae = 1/2D (1/4–1D) as a starting point; air blow recommended.
Size Chart
Applicable Materials
Hardened steels (HRC 45–62) · mold & die steels (P20, 718, H13, SKD11, Cr12) · welding parts · pre-hardened and hardened steels up to HRC 65 with BK2063.
Quality Control
From raw material to finished tool, every piece passes strict inspection for consistent, stable quality. 100 minutes of continuous cutting with minimal edge wear in hardened steel field tests.
