Twister Impact Rated HSS Cobalt Drill Bits

  • Product Code: Impact Rated HSS Cobalt Drill Bits
  • Availability: 2-3 Days
$0.00 Ex Tax: $0.00

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Provides up to 10 X Life in stainless steel* 

  • M35 Steel featuring 5% cobalt provides excellent heat resistance for extended life in tough metals and stainless steel
  • 1/4" quick-change shank is impact rated for impact drivers
  • 135° split point design helps centre the drill accurately and reduce 'wander'
  • Flute ground for increased durability
  • Manufactured to DIN 338 & ISO 1173:2001

HSS Cobalt can be used in:

  • Stainless Steel
  • Mild Steel
  • Cast Iron
  • Aluminium
  • Brass
  • Plastic
  • Fibre Reinforced Plastic (FRP)
  • Wood

Ideal for:

  • Fixing Holes
  • Tapping and Clearance Holes

*Vs Standard HSS. Tested in 2.5mm stainless steel within combi drill

Diameter Size mm Nominal Overall Length Nominal Working Length Part Number  
3.0mm 82mm 48mm


3.5mm 91mm 57mm THC03.5
4.0mm 96mm 62mm THC04.0
4.5mm 101mm 67mm THC04.5
5.0mm 107mm 73mm THC05.0
5.5mm 107mm 73mm THC05.5
6.0mm 114mm 80mm THC06.0
6.5mm 114mm 80mm THC06.5
7.0mm 114mm 80mm THC07.0
7.5mm 114mm 80mm THC07.5
8.0mm 114mm 80mm THC08.0

User Instructions

  • Try, where possible, to run at the recommended RPM for the product (please see speed chart)
  • Using an appropriate cutting lubricant will reduce drilling time and improve tool life. Try the Armeg Cutting Compound (ECC002)
  • Ensure accessory is cutting efficiently before applying pressure to avoid breakage at start-up
  • Pilot drilling with a smaller diameter first will reduce drilling time and improve tool wear
  • Try and keep ratcheting / impact function to a minimum when using an impact driver. This may involve reducing pressure momentarily
  • Do not use on SDS Hammer action


Operation Speed Chart

Diameter mm Mild Steel Free-Cutting Stainless Grey Cast Iron Aluminium Copper Brass
3 3400 1070 2120 8500 5300 3400
3.5 3000 930 1860 7500 4700 3000
4 2550 800 1600 6400 4000 2550
4.5 2200 700 1400 5600 3600 2300
5 2050 640 1280 5100 3200 2050
5.5 1900 680 1120 4300 3000 1900
6 1700 530 1060 4250 2670 1700
6.5 1600 500 1000 4000 2480 1580
7 1450 460 910 3660 2290 1450
7.5 1370 430 850 3400 2150 1370
8 1280 400 800 3200 2000 1280


Material Chart


Machine Recommendations

Tags: Drill Bit , Impact Rated , HSS , Metal , Twister , THC03.0 , THC03.5 , THC04.0 , THC04.5 , THC05.0 , THC05.5 , THC06.0 , THC06.5 , THC07.0 , THC07.5 , THC08.0


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