Chicago-Latrobe 50726 13/64 in 118 Degree Extra Long Drill Bit

Chicago-Latrobe 50726 Extra Long Drill Bit

The Chicago-Latrobe 50726 is a fractional inch drill bit sized at 13/64 in for general purpose machining tasks. It is built from high speed steel with a black oxide finish to resist wear during extended use. The 118 degree notched point helps start holes cleanly in metal and other materials. This bit suits machinists and maintenance crews needing reach beyond standard lengths.

Practical limits of the 118 degree notched point

The 118 degree point angle works well for general purpose drilling but can walk on very hard or curved surfaces without a centre punch. Maximum drilling depth reaches 9 in, so the bit cannot complete through holes in thicker workpieces. The 28 degree helix angle aids chip evacuation yet may clog in deep, sticky alloys if feed pressure is too high. Users needing faster penetration in stainless steel should consider a split point geometry instead.

Build quality and daily implications

High speed steel construction with black oxide coating provides durability for repetitive shop use while reducing friction. The extra long 4xD body allows access to recessed holes but increases deflection risk if the workpiece is not rigidly clamped. The straight shank fits standard three jaw chucks without special adapters. Operators should withdraw the bit frequently to clear swarf and prevent overheating during deep cuts.