Bits and cutters of industrial and dental quality: Drill bits (all measures in mm).

For metal, plastic, wood: HSS drill bits



Note: The term HSS for this tool category comes from the utilised drill material. High speed steel (HSS) is a high alloy tool steel extremely resistant to wear due to its manufacturing process and is dimensionally stable up to approx. 600°C. Cutting oil or coolant emulsion should be used as cooling lubricant, when machining steel. Spirits or petroleum should be used for aluminium. Normally, plastic and wood can be dry-machined.



NO 28 864



NO 28 852



NO 28 854



NO 28 856



NO 28 858

HSS drill bits

Selected steel quality. Purpose-made stable construction with high concentricity. Shaft and bit are manufactured from a one-piece blank. High hardness for optimum life expectancy and elasticity. For drilling metal, non-ferrous metals, plastic, PC cards and wood. Work speeds: soft materials approx. 8,000rpm, hard materials approx. 3,000rpm. Ø shanks 2.35mm. Rotational speed see table.


NO 28 874

HSS twist drill bits
in storage case

10-piece set. Similar to DIN 338. Ø 0.3 - 0.5 - 0.8 - 1 - 1.2 - 1.5 - 2 - 2.5 - 3 - 3.2mm. For drilling non-ferrous metal, steel and stainless steel. In labelled cassette with fold back and stand function. For clamping we recommend our 3-jaw drill chuck. Rotational speed see table.


NO 28 876

HSS twist drill bit set
with centring pin in storage case

6-piece set. Ø 1.5 - 2.0 - 2.5 - 3.0 - 3.5 - 4.0mm. For precision tapping of wood and plastics; also non-ferrous metal, steel and stainless steel sheets. Titanium coating reduces friction and increases service life. Shaft Ø 3mm, 6-piece set. Rotational speed see table.

For steel, glass, circuit boards: Tungsten carbide drill bits




NO 28 324



NO 28 326



NO 28 328

Tungsten carbide drill bits

Made of wear-resistant tungsten carbide. For drilling glass, semiprecious stones, porcelain, ceramics, marble and other hard stones. The hard stones are subdivided according to the degree of hardness from 1 - 10. Tungsten carbide can be used up to hardness degree 6. Drilling hard stones with a hardness degree of more than 6 calls for the use of diamond tools. Shaft Ø 3.0mm. With ideal cutting angle of 6°. Rotational speed see table.



NO 28 320



NO 28 321

Tungsten carbide milling drill bits (spear drill bits)

For drilling, milling and cutting fibre glass or PERTINAX circuit boards. Also for drilling pearls and similar. Shaft Ø 2.35mm. Rotational speed see table.

For glass, ceramics, plastic: Diamond tools



NO 28 255

Diamond twist drill bits

For drilling holes in (semi) precious stones, etc. Shaft Ø 2.35mm.

Rotational speed for spiral drills of HSS and tungsten carbide in rpm

Drill Wood Aluminium Brass Steel Stainless Steel Plastics
Ø HSS TC HSS TC HSS TC HSS TC HSS TC HSS TC
0.5 20000   23000   35000   60000   25000   40000   15000   30000   9000   22000   19000   33000  
1.0 12000   17000   22000   45000   15000   25000   8000   18000   5000   10000   11000   20000  
1.5 9000   12000   14000   30000   10000   15000   5500   13000   3500   9000   8000   15000  
2.0 7000   9000   11000   23000   8000   12000   4000   9000   3000   8000   6000   10000  
2.5 6000   7000   9000   19000   6000   10000   3500   7500   2500   7000   5000   8000  
3.0 5000   6000   7500   15000   5000   8000   3000   6500   2000   6000   4000   7000  
3.5 4000   5000   6000   13000   4500   7000   2500   5500   1500   4500   3500   6000  
4.0 3000   4500   5500   10000   4000   6000   2000   4500   1000   3000   3000   5000  


The specified rotational speeds are approximate values for spiral drills made of HSS and tungsten carbide. They must be appropriate for the material of the workpiece. The use of coolant is recommended for aluminium, brass, steel and stainless steel. Plastic can be cooled with compressed air to prevent the drilling chips from fusing. The hardness of derived timber products varies distinctly, therefore only an approximate value can be specified. The harder the wood, the lower the rotational speed!