MICROMOT accessories for rotary tools: Drills (all measurements in inch)

For metal, plastic, wood




NO 28 864



NO 28 852



NO 28 854



NO 28 856



NO 28 858

Tungsten Vanadium Micro Twist Drills

Manufactured from one-piece blanks in tungsten vanadium steel for highest concentricity, providing breakage safety and long lifetime. For drilling metal, non-ferrous metals, plastic and wood. All shanks Ø 3/32" (2.35mm). Work speeds: soft materials approx. 8,000 rpm, hard materials approx. 3,000rpm (see table).


NO 28 874

HSS Twist Drill

For drilling in steel, sheet metal, cast iron, non-ferrous metals, wood, plastics etc. One each Ø 3/256", 1/32", 5/128", 3/64", 2/32", 10/128", 1/10", 15/128", 1/8" (0.3, 0.5, 0.8, 1.0, 1.2, 1.5, 2.0, 2.5, 3.0, 3.2mm). Rotational speed see table.


NO 28 876

HSS Twist Drill Set with brad point

1/16" - 5/64" - 3/32" - 1/8" - 9/64" - 5/32" (1.5-2.0-2.5-3.0-3.5-4.0mm). The titanium nitrate coating reduces friction and increases life expectancy. Rotational speed see table.

For steel, glass, circuit boards




NO 28 324



NO 28 326



NO 28 328

Tungsten Carbide Micro Drills

With ideal cutting angle of 6°. Especially for drilling in glass, porcelain, ceramics, marble (also semi-precious stones) and other hard stones. All shanks Ø 7/64" (3mm). Rotational speed see table.



NO 28 320



NO 28 321

Tungsten Carbide Spear Drills

For drilling, cutting and separating fiberglass reinforced plastic, thermosetting plastic, non-ferrous metals, also for drilling into pearls, corals, etc. All shanks Ø 3/32" (2.3mm). Rotational speed see table.

For glass, ceramics, plastic



NO 28 255

Diamond Twist Drills

With natural diamond dust for cleaning out holes in pearls, coral, turquoise and other precious stones. Shanks Ø 3/32" (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!