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Carbide Micro Drill Bits


Sizes available: 0.1mm - 3.175mm (1/8")

These very hard solid tungsten carbide micro twist drill bits are a cheaper alternative to our superior carbide spade drills. Excellent for drilling through all hard metals. Ensure a steady hand when using these drills, ideally used at high speed in a pillar drill.

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TIP: Broken Carbide twist drills can be used to make carbide gravers and carbide scribers

Most horologists find the easiest way to use them is by first finding the centre with a graver and then holding a micro drill in a pin-vice and then taking them to the work. Use very light pressure whilst taking the drill in and out periodically. No lubrication is necessary although a small dab of oil can help. 

Extra care is needed with handling these drills as they are very delicate, especially sizes from 0.1mm - 0.4mm. Make sure everything is running true without any lateral movement.

These drills are also perfect for delicate drilling through hard materials for model engineering, archeology and scientific laboratory work.

Ideal for drilling through PCB, printed circuit boards. Made of fibreglass, printed circuit boards require a tough micro drill and our tungsten carbide drills range will outperform similar HSS drill bits.

Do not exceed 50,000 RPM's


High quality Tungsten Carbide throughout

  • Shank Diameter: 3.175mm = 1/8"
  • Split Point: 135 degree
  • Overall length: 38mm

Effective Cutting Length Varies as follows:

  • 0.1mm = 1.5mm
  • 0.2mm = 3.5mm
  • 0.3mm = 5.5mm
  • 0.4mm = 7mm
  • 0.5mm = 8.5mm
  • 0.6 - 0.9mm = 9.5mm
  • 1.00 - 1.20mm = 10.5mm
  • 1.30 - 1/8" = 12mm

Customer Reviews

As Above
Speedy delivery, thanks, but 3 of the 4 drill bits broke within seconds of use. They were so brittle. The one that is left is great.
They need to be much shorter at the smaller diameters. Two of them broke as the bit went through and wedged in the hole. Anybody using a 0.2mm drill doesn't need a 5mm deep hole.
Very well deigned bits with a substantial shank.
These have got me out of a number of holes (ha, ha!!) over the years. I rely on them to very much.

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