Chicago-Latrobe 53439 39/64 in 118° Cobalt Drill 1/2 Shank

Chicago-Latrobe 53439 Cobalt Drill Bit

The Chicago-Latrobe 53439 is a 39/64 in cobalt steel drill bit designed for drilling tough materials such as stainless steel and high-strength alloys. Its 118 degree point angle provides reliable centring and chip evacuation in general-purpose machining. The straw bronze finish helps identify the tool and reduces friction during cutting. It suits machinists and maintenance technicians who need a durable bit for heavy-duty metalwork.

Fits 1/2 Inch Chucks With Reduced Shank

The bit features a reduced 1/2 in shank that allows it to be secured in standard drill presses and large hand drills without requiring a larger chuck capacity. This design frees up the need for specialised tool holders while still delivering the cutting diameter of 39/64 in. The shank fits directly into common 1/2 in capacity chucks found in many workshop environments. No additional adapters or sleeves are required for installation.

Cobalt Steel Holds Edge Under Sustained Heat

Cobalt steel construction maintains hardness at the elevated temperatures generated during prolonged drilling in hard metals. The 118 degree point geometry distributes cutting forces evenly to reduce premature wear during extended operations. The straw bronze surface treatment assists with heat dissipation and chip flow over long cuts. This bit is not suited for wood, plastic or soft non-ferrous materials where a different point angle would perform better.