BB Micro Drill Bits – Long Flute | OAL 50–75mm | Shank Ø4mm | Ø1.0–2.95mm | Carbide

Micro Diameter | Extended Flute Length – Built for Precision Deep Drilling

The BB Micro Long-Flute Drill Bit features an extended flute length up to 30mm on a compact Ø4mm shank, with an overall length (OAL) up to 75mm. Designed for micro-diameter drilling (Ø1.0–2.95mm), it delivers exceptional reach and precision in deep, narrow holes where standard short-flute drills cannot.

Full Specification Range

• Flute Diameter: Ø1.0 / 1.1 / 1.2 / 1.3 / 1.4 / 1.5 / 2.0 / 2.5 / 2.75 / 2.95mm — 10 sizes available
• Shank Diameter: Ø4mm (universal round shank)
• Flute Length: 16mm / 20mm / 30mm (extended flute options)
• Overall Length (OAL): 50mm / 75mm
• Series: BF2055 / BC2055 / BB2055 — 3 grades for different materials
• Total SKUs: 243 variants — comprehensive coverage for precision machining needs

Why Choose the BB Micro Long-Flute Drill?

• Micro Diameter Range (Ø1.0–2.95mm): Ideal for fine, intricate holes where standard drills are too large.
• Extended Flute Length (up to 30mm): Reaches deeper cavities without repositioning — perfect for molds, dies, and precision components.
• Nano Coating: Superior heat resistance and wear protection extends tool life significantly, reducing tool change frequency.
• Double Helix Chip Evacuation: Rapid chip removal during high-speed operation prevents clogging and heat buildup.
• Fully Ground Cutting Edge: All-grind precision ensures consistent, clean entry and smooth cutting performance.
• Ultrafine Carbide Substrate: High toughness + high hardness for stable, fast cutting in demanding materials.
• Universal Round Shank with Anti-Slip Design: Secure chuck grip, no slipping under load.

Compatible Materials

• Steel & Hard Metals: Iron plate, stainless steel, die steel, quenched steel
• Non-Ferrous: Aluminum alloy, magnesium alloy, copper, mirror-finish aluminum

Available Series

• BF2055 – Optimized for aluminum & non-ferrous materials; mirror-finish results on aluminum alloy, magnesium alloy & copper
• BC2055 – DLC dual coating for extreme wear resistance; ideal for hard steels and high-frequency production
• BB2055 – Premium grade nano coated; versatile for steel, stainless, die steel & quenched steel