Chicago-Latrobe 48920 Screw Machine Drill Bit 5/16 in 118 Degrees Left Hand

Screw Machine Drill Bit 5/16 Inch

This Chicago-Latrobe drill bit is a high-speed steel cutting tool designed for screw machine applications. Its 5/16 inch diameter and left-hand cutting direction suit specific machining operations. The bright, uncoated finish provides a standard surface for general-purpose drilling tasks. Machinists requiring left-hand rotation will find this bit appropriate.

118 Degree Point Angle Limitation

The conventional 118-degree point angle offers a standard cutting profile for general materials. This geometry may not be optimal for very hard or abrasive workpieces where a split point or different angle performs better. The lack of coolant-through capability requires external lubrication for deep holes or tough alloys. Users drilling stainless steel or high-temperature alloys should evaluate if this point geometry meets their needs.

Left Hand Cutting Direction Decides Fit

The left-hand cutting direction is the critical specification determining compatibility with your equipment. This bit only operates correctly in spindles or drivers providing counter-clockwise rotation. Standard right-hand drill chucks and typical portable drills cannot use this tool effectively. Verify your machine rotation direction before purchase to avoid a mismatch.