Chicago-Latrobe 78600 1/4 in 140° solid carbide straight flute drill

Chicago-Latrobe 78600 solid carbide drill bit

The Chicago-Latrobe 78600 is a 1/4 inch solid carbide straight flute drill bit designed for machining hard and abrasive materials. Its rigid carbide construction resists wear and deflection better than high-speed steel alternatives. Machinists and fabricators use it for precise holemaking in tough alloys and composites.

Upgrading from high-speed steel to carbide

Switching to this carbide bit extends tool life and holds tighter tolerances when drilling hardened steels, cast iron or non-ferrous metals. The jump is worth it when high-speed steel dulls too quickly or cannot maintain the required finish. Carbide also allows higher cutting speeds for shorter cycle times in repetitive production work.

Verify machine rigidity and coolant setup

Solid carbide requires a rigid spindle and secure workholding to prevent chipping the cutting edges. Confirm your equipment can run the recommended speeds and feeds for carbide tooling without excessive vibration. A flood or mist coolant system helps manage heat and evacuate chips from the straight flutes during deep cuts.