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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.

Each drill bit is individually boxed with a protective rubber sleeve. Be careful when removing the rubber sleeve to avoid snapping the more delicate sizes such as 0.1mm and 0.2mm.

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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


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