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 micro drills are more likely to snap. They are a good option when you need added rigidity, shorter flute lengths, and a more durable drill geometry for precision small-hole work.

Originally used for PCB slotting and pecking-slot operations, this slot-drill style geometry is also useful 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. Use the dropdown selector to choose the exact drill size, flute length, and available condition.

View Carbide Drill Bit Feed & Speed Starting Guide

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 similar demanding materials
• Light drilling in metals and other rigid materials where added durability is helpful

Product Details

• Tool type: Break-resistant micro carbide drill
• Geometry: Slot-drill style / reinforced-core drill geometry
• Material: Micro-grain solid carbide
• Shank diameter: 1/8" (3.175 mm)
• Sold by size: Choose the exact size from the dropdown selector
• Condition options: New and factory resharpened options available
• Depth stop ring: Included on many options for plunge-depth control and size identification

If your application tends to snap standard micro drills, these break-resistant micro carbide drills are a practical option to try before increasing drill size or changing your setup.

Looking for standard individual carbide drill sizes instead?
Carbide Drill Bits — Choose Your Size

Looking for a range of drill sizes instead?
View our carbide drill variety sets