Micro Carbide Drill Bits | Choose Individual PCB Drill Sizes

Shop micro carbide drill bits in individual sizes from approximately .004" to .295" for PCB drilling, circuit board drilling, CNC work, plastics, composites, electronics prototyping, model making, and precision small-hole drilling.

This collection is organized into size-range listings so you can choose the exact carbide drill diameter you need. These small solid carbide drills are commonly used as PCB drill bits, circuit board drill bits, miniature CNC drills, and precision drills for holes that are too small for standard drill sizes.

Most drills have a standard 1/8" shank for common PCB drill holders, CNC collets, rotary-tool accessories, and precision drilling setups. Use the product listings below to select individual micro drill sizes by diameter range.

Common Uses

  • PCB drilling and circuit board drilling
  • Electronics prototyping and circuit board repair work
  • CNC drilling of small precision holes
  • Plastics, composites, fiberglass, and suitable non-metallic materials
  • Model making, hobby work, and miniature fabrication
  • Carburetor jet checking, cleaning, and careful resizing when the correct size is selected

Choosing Individual Micro Drill Sizes

Use the product listings below to choose individual carbide drill sizes by diameter range. This collection may also include break-resistant carbide drill options, one-size resharpened drill quantities, and overstock individual-size drill specials when available.

For quick reference, the listings are grouped by decimal-inch diameter ranges so you can narrow down the size you need without scrolling through every individual drill size.

Important Use Notes

  • Micro carbide drills are hard and accurate, but they are also brittle.
  • Use a stable setup and keep the drill straight to avoid bending or side-loading.
  • For the smallest sizes, avoid handheld electric drills and use a pin vise, drill press, PCB drill holder, CNC machine, or other controlled setup.
  • Use light pressure and appropriate speed/feed settings for the material being drilled.
  • Secure the workpiece and minimize runout, especially with very small drill diameters.

Need help comparing drill sizes?

Compare decimal-inch, metric, number-size, and fractional drill equivalents: view the micro carbide drill size chart →

Looking for a range of drill sizes instead?

Browse carbide drill variety sets, including metric, fractional, incremental, one-size, and larger assortment sets: view carbide drill variety sets →

Need help with starting speeds and feeds?

Review starting recommendations for solid carbide micro drills: view the carbide drill bit feed and speed guide →

Shopping specifically for carburetor jet drills?

Compare drill sets selected for carburetor jet sizing, cleaning, and tuning: view carburetor jet drill sets →

Browse the product listings below to choose the micro carbide drill size range you need.