Chicago-Latrobe 44917 17/64 in 135 Degree Cobalt Jobber Drill Bit

Chicago-Latrobe 17/64 in Cobalt Jobber Bit

The Chicago-Latrobe 44917 is a 17/64 inch cobalt jobber length drill bit built for heavy-duty drilling in hard metals. Its 135 degree split point reduces walking and starts holes cleanly without a centre punch. The TiAlN coating adds wear resistance and helps manage heat during extended use. It suits maintenance technicians and metal fabricators who need reliable performance in stainless steel or high-strength alloys.

Straight shank fits standard chucks without adapters

The bit installs directly into any three-jaw chuck that accepts a 17/64 inch shank, so no special holders or bushings are required. Cobalt steel is harder than high-speed steel, so feed pressure must stay steady; forcing the cut can chip the cutting lips. The split point geometry reduces thrust, but the drill press or hand drill must run true to avoid premature wear. Coolant is recommended for deep holes because the bit has no internal coolant holes.

Verify chuck capacity

Check that your drill chuck opens to at least 17/64 inch (decimal equivalent 0.2656) and that the spindle run-out is minimal. The 135 degree point angle is optimised for hard materials; softer metals such as aluminium may grab and require a different point geometry. Ensure your application does not need through-coolant delivery, as this bit has zero coolant holes. The TiAlN coating performs best with rigid setups and consistent feed rates.