Milwaukee Metal HSS-Co Cobalt Drill Bit 8.5 mm, 5-Pack, DIN 338, 135° Split Point

In a busy metalworking shop, a fabricator reaches for the Milwaukee 4932373351 HSS-Co cobalt drill bit set to bore precise 8.5 mm holes in stainless steel brackets. The 5% cobalt alloy (M35) withstands high temperatures, maintaining hardness when drilling tough metals. Each bit features a 135° split point that self-centers and reduces walking, ensuring accurate starts without a center punch. The right-hand spiral flutes efficiently evacuate chips, while the bright finish provides corrosion resistance. Conforming to DIN 338, these bits have a 117 mm overall length and 75 mm flute length, suitable for standard drill chucks. Pack of 5.

Key specifications

• Drill bit type: HSS-Co cobalt twist drill bit
• Diameter: 8.5 mm
• Quantity: 5 pieces
• Material: HSS with 5% cobalt (M35)
• Point angle: 135° split point
• Shank: Cylindrical
• Standard: DIN 338
• Overall length: 117 mm
• Flute length: 75 mm
• Finish: Bright
• Application: Metal drilling (steel, stainless steel, cast iron, non-ferrous metals)

Why choose it

Cobalt alloyed high-speed steel offers superior heat resistance and durability compared to standard HSS bits. The 135° split point eliminates the need for center punching and prevents walking on smooth surfaces. Precision ground flutes ensure fast chip removal and reduced friction, extending tool life. Ideal for professional use where accuracy and longevity are critical.

Ideal use cases

• Drilling stainless steel and alloy steels in fabrication
• Creating holes in cast iron components
• Working with non-ferrous metals like aluminum and brass
• Maintenance and repair tasks in industrial settings

Good to know

Use cutting fluid or lubricant when drilling hard metals to maximize bit life. The cylindrical shank fits standard keyed or keyless chucks. Store in a dry place to prevent corrosion. For best results, operate at recommended speeds for cobalt bits.