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Carbide Micro Drill Bits

CMD1

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

These very hard, solid tungsten carbide, micro twist drill bits are excellent for producing smooth, precision holes and 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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Drill Size

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Description

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.

Technical

High quality Tungsten Carbide throughout

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


Size (mm)

Effective cutting length (mm)
Spindle speed (rpm)
Feed rate (m/mm)
Chip load (mm/rev)
0.1


1.5
125,000
0.8
0.006
0.2


3.5
125,000
1.5
0.012
0.3


5.5
125,000
2.3
0.018
0.4


7.0
125,000
2.9
0.024
0.5


8.5
95,500
2.9
0.03
0.6


9.5
79,600
2.9
0.036
0.7


9.5
68,200
2.9
0.042
0.8


9.5
59.700
2.9
0.048
0.9


9.5
53,100
2.9
0.054
1.0


10.5
47,800
2.9
0.06
1.1


10.5
43,400
2.9
0.066
1.2


10.5
39,800
2.9
0.072
1.3


12.0
36,700
2.9
0.078
1.4


12.0
24,100
2.9
0.084
1.5


12.0
31,800
2.9
0.090
1.6


12.0
29,900
2.9
0.096
1.7


12.0
28,100
2.8
0.10
1.8


12.0
26,500
2.7
0.10
1.9


12.0
25,100
2.5
0.10
2.0


12.0
23,900
2.4
0.10
2.1


12.0
22,700
2.3
0.10
2.2


12.0
21,700
2.2
0.10
2.3


12.0
20,800
2.1
0.10
2.4


12.0
20,000
2.0
0.10
2.5


12.0
20,000
2.0
0.10
2.6


12.0
20,000
2.0
0.10
2.7


12.0
20,000
2.0
0.10
2.8


12.0
20,000
2.0
0.10
2.9


12.0
20,000
2.0
0.10
3.0


12.0
20,000
2.0
0.10
1/8"


12.0
20,000
2.0
0.10


Customer Reviews

Incredible micro drills. Drilling in stainless steel was no problem. They also come in useful plastic cases to keep them safe.
A little too brittle was unable to complete the task as all bits ordered snapped.
Good to use if you're careful.
The drills were package individually in plastic tubes which were placed in individual protective plastic cases with the drill sizes marked on the exterior of the case. The drills are solid carbide and are very fragile. Ham-handed people should not order them. That is NOT a fault of the tool. A tenth millimeter drill is by definition fragile.
I have snapped a few but having discussed this with Eternal, it was down to me, not running the bits at high enough speed.<br/>I had problems with normal HSS Bits drifting very slightly before they bite but the Carbide bits are spot on and very accurate. They also come in a great range of sizes, which are all in stock.<br/><br/>The attached image shows little plates in 1/4" brass that needed a 1.9mm hole in the centre and a 2.5mm hole either side. I think you can see how clean the holes are and each is perfectly accurate. These plates are used in pairs, so they have to be identical as they form joints in some metal characters that I am creating.
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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