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1. Cobalt Jobber Drill Sets   |   2. Cobalt Drill   |   3. Spot Drill
 4. Center Drill   |   5. Countersink 
Cobalt Drills & More
HaasTooling.com
HOLEMAKING
Cobalt Drill Overview
J
obber-length drills are the most common, general-purpose drills. They feature a long 
length compared to their diameter, and offer a good balance of strength and accuracy 
for drilling in a wide range of materials. Available in fractional, letter, number, and 
metric sizes.
These drills are constructed of 8% cobalt high-speed steel (HSSCo8), which is harder than standard 
high-speed steel (HSS), and provides better wear resistance and higher hardness. They feature 
a 135° split point* and 30° flute helix, and are suitable for drilling steel and stainless steel, with 
secondary applications in cast iron, aluminum, and high-temp alloys. The TiN (Titanium Nitride) 
coating adds lubricity, and increases hardness and heat resistance, allowing these drills to run at 
higher speeds and feeds than HSS.
Cobalt drills are less expensive than carbide, are less prone to chipping, and may be resharpened to extend their life.
NOTE: A spot drill is recommended to ensure accurate hole locations.
* Normal point below 1/16" (1.6mm).
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Great price and quality
These drill bits are well made and hold up great to everyday use, and replacement 
bits are affordable. I will continue to purchase my drill bits from Haas.
Tristan Jones 06/07/2023
APPLICABLE WORKPIECE MATERIALS	
HSSCO8
P - STEEL
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M - STAINLESS STEEL
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K - CAST IRON
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N - ALUMINUM / NON-FERROUS
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S - HIGH-TEMP ALLOYS
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H - HARDENED METALS
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