Bordo 2mm HSS Cobalt Extra Deep Hole Drill Bit 135mm

Bordo HSS-Co cobalt drill bits drill stainless steel, high-tensile alloys, and hard materials where standard HSS would dull rapidly. The HSS Cobalt Extra Deep Hole Drill Bit is part of Bordo's comprehensive Australian cutting tool range — trusted by engineers, tradespeople, and machinists across industry and manufacturing.

Where this product is used

HSS-Co (cobalt) drill bits contain 5–8% cobalt alloyed into the steel — they resist the heat generated when drilling stainless steel and high-tensile alloys.

• Drilling hard and work-hardening steels including stainless steel and high-tensile alloys
• Aerospace, food processing, and marine fabrication drilling
• Engineering production where drill bit life on difficult materials is critical

Key specifications

Selecting the right option

HSS-Co (cobalt) drills run at lower speeds than standard HSS — cutting speed should be reduced by 25–30% on stainless steel to prevent work hardening. Jobber length is the standard for most applications; short (stub) series suits rigid setups where deflection is a concern.