Cleveland Jobber Drill #8 Cobalt 135° Split Point .1990 C16619

Jobber Length Drill Bit #8

This Cleveland drill bit is a jobber-length accessory sized at #8 with a 135-degree split point. It is made from cobalt steel with a TiN coating for drilling into hard materials. The decimal equivalent of the size is .1990 inches. It is designed for general-purpose drilling tasks in metalworking applications.

Practical Limits of Cobalt Drill Bits

Cobalt bits handle high heat better than standard high-speed steel but are more brittle and can chip if the workpiece moves. The split point reduces walking on flat surfaces yet offers less benefit on curved or angled stock. The TiN coating adds lubricity but wears away over time, after which cutting performance reverts to the base cobalt substrate. This bit has no coolant-through channels, so deep holes require frequent withdrawal to clear chips and manage temperature.