Chicago-Latrobe 70228 7/16" HSS TiN 118° Jobber Drill Bit pneumatic accessory

7/16" HSS TiN Jobber Drill Bit

The Chicago-Latrobe 70228 is a 7/16 inch fractional drill bit made from high speed steel with a titanium nitride coating. It uses a conventional 118 degree point angle for general purpose drilling. The decimal equivalent is .4375 inches. It suits mechanics and metalworkers needing a durable bit for handheld or press operations.

Build integration and clearance

The straight shank fits standard three jaw chucks on pneumatic or electric drills without adapters. Jobber length provides standard reach for through holes in sheet metal, plate or structural steel. The TiN coating reduces friction so the bit runs cooler and clears chips efficiently without coolant holes. It frees the operator from frequent bit changes in repetitive drilling tasks.

Coating and geometry benefits

The titanium nitride surface treatment increases surface hardness and wear resistance compared to uncoated high speed steel. The 118 degree conventional point centers easily on flat surfaces and reduces walking at the start of the cut. No coolant through holes means the bit relies on external lubrication or dry cutting in suitable materials. The coating extends service life in ferrous metals and abrasive alloys.