Solid Carbide End Mill for Steel | BB2055 | 2 & 4 Flute | 1-20mm

BB® Tungsten Steel Solid Carbide End Mills

Solid carbide tools offer long tool life and faster cutting speeds than other substrates, but are more brittle and must be used with rigid tool-holding systems.

Dimensions & Tolerances

Tolerance of End Mill Diameter:

• 1 < D ≤ 6 mm: -0.010 ~ -0.030
• 6 < D ≤ 10 mm: -0.015 ~ -0.040
• 10 < D ≤ 20 mm: -0.020 ~ -0.050

Industrial Design

Negative front angle and large chip space for easier roughing and finishing. Reduces tool changes and saves production time.

Helix Angle: 35°, high adaptability to workpiece material and hardness. Widely used in mold and product processing.

Coating

High-performance coating improves tool life, production efficiency, and cutting performance.

Application

Suitable for: Milling machines, CNC machining centers, drill presses, engraving machines. Materials: metal, wood, alloy steel, stainless steel, and more.

• 2 Flutes: Slotting, sinking, soft materials
• 4 Flutes: High rigidity, shallow slot, profile milling, finish machining

Series Specifications

BB® BB2055 -Basic

• Color: Copper
• Density: 14.5 g/cm³
• Hardness: HRA 91.5
• Grain Size: 0.7-0.6 μm grain size
• Bending Strength: 3000 N/mm²
• Raw Material: ZK30UF with 10% Co content
• Coating: TiSiN — high surface hardness, good wear resistance
• Suitable for: General steel (≤HRC 45), stainless steel, hardened steel

Cutting Parameters

• ap = 1/3D (range: 1/8–1/2D)
• ae = 1/2D (range: 1/4–1D)
• fz = 0.15 mm (range: 0.02–0.2 mm)

Adjust parameters according to workpiece material and hardness.

Application Case

Customer: Russia | Machining Expert: A. Golubtsov

Challenge: Finishing copper with a Ø1.5mm 4-flute micro end mill. Slot depth 3mm, tolerance ±0.3mm. Tool deflection during finishing caused oversized slots.

Solution: Used BB Tools 1.5mm coated 4-flute end mill with step-finishing strategy (roughing + 0.1–0.2mm light finishing pass) to eliminate deflection and ensure dimensional stability.

Key Parameters:

• Speed: 8000 RPM / Feed: 400 mm/min
• Radial engagement: 0.65mm (rough) / 0.1–0.2mm (finish)
• Overhang: 25–30mm / Coolant: Emulsion directly on tool

Customer Feedback: "BB Tools 1.5mm end mills are reliable. With the right strategy, they solve deflection issues in copper micro-machining."

Quality Control

From raw materials to finished products, every BB tool undergoes strict inspection to ensure consistent and stable quality.