Chicago-Latrobe 78591 7/64 in 140 Degree Carbide Straight Flute Drill

Chicago-Latrobe 78591 Carbide Drill

This 7/64 inch solid carbide straight flute drill is built for precision hole-making in abrasive or hardened materials where high-speed steel wears too quickly. It suits machinists and maintenance technicians who need consistent hole size and finish without frequent resharpening. The bright uncoated surface and 140 degree point angle support accurate starting in a range of ferrous and non-ferrous alloys.

Sustained cutting behaviour

Carbide holds its edge far longer than steel under continuous feed, so the drill maintains diameter and surface quality through long production runs without the deflection that leads to oversize holes. The four-facet point reduces thrust force, lowering heat buildup at the tip and helping the tool stay on centre during deep passes. Bright finish chips evacuate cleanly through the straight flutes when coolant or air blast is used.

Installation and common issues

The straight shank fits standard drill chucks and collets without adapters; secure it firmly to prevent slippage under the high torque carbide can generate. Run at the correct surface speed for the workpiece material — excessive RPM causes chipping, while too slow a feed work-hardens the hole wall. Avoid hand-held use; the brittle carbide snaps if the drill walks or the workpiece shifts. Buyers who need a coated tool for stainless steel or a split-point geometry for self-centring without a pilot should select a different drill.