Chicago-Latrobe 50078 135° Cobalt Jobber Drill Bit 9/16 in

Chicago-Latrobe 50078 Cobalt Jobber Bit

The Chicago-Latrobe 50078 is a heavy-duty jobber-length drill bit made from cobalt steel. Its 135-degree split point reduces walking and starts holes cleanly in hard materials. The fractional 9/16 inch size suits maintenance and fabrication tasks. Cobalt construction resists heat and wear during extended drilling sessions.

Suits hard-metal drilling.

This bit serves machinists and technicians drilling stainless steel, titanium and other tough alloys without through-coolant capability. The split-point geometry helps accuracy on curved or angled surfaces. Buyers needing internal coolant delivery or carbide-grade tooling should look at different tooling. The straw-bronze finish identifies the cobalt substrate.

135-degree split point starts holes on contact

The 135-degree split point is the decisive spec: it self-centres on hard metals without a centre punch. Decimal equivalent 0.5625 inch confirms the exact diameter for tight-tolerance work. Jobber length provides standard reach for general-purpose drilling. No coolant holes means external lubrication is required.