Drill Bits Unlimted
Break-Resistant Micro Carbide Drills – Slot-Drill Geometry – Choose Size
Break-Resistant Micro Carbide Drills – Slot-Drill Geometry – Choose Size
(R/S) indicates factory resharpened drills; sizes without (R/S) are new.
Volume Discounts for the Same Drill Size
25+ pieces: 5% off
50+ pieces: 8% off
200+ pieces: 10% off
Discounts apply to each individual drill size. Different sizes cannot be combined to reach quantity breaks.
Couldn't load pickup availability
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.
Need help comparing drill sizes?
Use our Drill Bit Size Chart to compare decimal-inch, metric, number-size, fractional, and letter drill sizes.
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?
View all micro carbide drill bit size ranges
Looking for a range of drill sizes instead?
View carbide drill variety sets
Available drill diameters in this listing:
This listing includes select break-resistant micro carbide drill sizes from approximately .016" to .065". Some close number, metric, and fractional sizes are grouped together because they are commonly used interchangeably in small-drill applications.
#78 / 1/64" / 0.40 mm, #77 / 0.45 mm, #76 / 0.50 mm, #73 / 0.60 mm, #72, #71 / 0.65 mm, #70 / 0.70 mm, #69 / 0.75 mm, #68 / 1/32" / 0.80 mm, #67 / 0.80 mm, #66 / 0.85 mm, #65 / 0.90 mm, #64, #63 / 0.95 mm, #61 / 1.00 mm, #60, #59 / 1.05 mm, #58, #57 / 1.10 mm, 1.15 mm, #56 / 1.18 mm, 3/64" / 1.20 mm, 1.25 mm, 1.30 mm, #55 / 1.30 mm, 1.35 mm, #54 / 1.40 mm, 1.45 mm, #53 / 1.50 mm, #52, and 1.65 mm.
Some sizes may be available in more than one flute length or condition. Use the dropdown selector above to choose the exact available option.
Share
