Break-Resistant Micro Carbide Drills – Slot-Drill Geometry – Choose Size

Sizes marked (R/S) are factory resharpened.

Breaking standard micro drills? These break-resistant micro carbide drills are designed for demanding jobs where ordinary drills are more likely to snap.

Originally used for PCB slotting and pecking-slot operations, this geometry is also an excellent choice for other precision drilling applications where rigidity, durability, and reduced breakage matter.

Available in both new and factory resharpened sizes. Variants marked (R/S) are factory resharpened.

Break-Resistant Micro Carbide Drills

These drills use a slot-drill style geometry with a stronger core, reduced flute cavity depth, and in many cases a shorter flute length. This combination helps improve rigidity and makes them a smart choice when standard micro drills tend to break under demanding conditions.

Why choose this geometry?

• Helps reduce breakage in difficult drilling applications
• Stronger core and reduced flute cavity depth improve drill rigidity
• Often shorter flute lengths help resist flexing and snapping
• High-helix flute geometry supports chip removal during pecking and slotting operations
• Shallow point angle helps minimize backside breakout and splintering
• Back-tapered flute design helps reduce top-surface splintering

Common applications

• PCB fabrication
• Pecking slots and slotting-style operations
• Precision drilling where standard drills are prone to breakage
• Fiberglass, FR-4, plastics, wood, composites, and other demanding materials
• Light drilling in metals and other rigid materials where added durability is helpful

Product details

• Micro-grain solid carbide construction for hardness, rigidity, and wear resistance
• 1/8" shank (3.175 mm) fits most PCB drilling equipment, small CNC spindles, and precision drill setups
• Colored depth stop ring for consistent plunge depth, size identification and control
• Sold individually by size — choose the exact size you need from the dropdown
• New and factory resharpened options available

If your application tends to snap standard micro drills, these are a great option to try.