Chicago-Latrobe 77669 1/2 in 118° Carbide Tipped Drill Bit

1/2 in Carbide Tipped Drill Bit

The Chicago-Latrobe 77669 is a jobber length drill bit with a 1/2 inch diameter and a 118 degree conventional point. Its carbide tipped construction provides hardness for drilling abrasive or tough materials. It is suited for machinists and maintenance technicians who need a durable bit for general purpose drilling tasks.

Capacity and headroom in tough materials

The 1/2 inch size handles larger hole requirements in steel, cast iron and non-ferrous alloys. Carbide tips resist wear longer than high speed steel when run at appropriate speeds. The bright uncoated surface works well in many applications but lacks the lubricity of coated bits in sticky materials. It runs out in deep holes where coolant through capability would clear chips more effectively.

Build quality and daily use implications

The solid carbide tip is brazed to a steel body for shock resistance during hand held or machine drilling. A straight shank fits standard three jaw chucks and collets without adapters. Zero coolant holes mean external flood or mist coolant must be directed at the cut zone. The 118 degree point centres easily on flat surfaces but may walk on curved or angled entries without a spot drill.