Cleveland Golf Jobber Drill 17/64 Parabolic Cobalt 135° 2075

Jobber Drill for Cobalt Steel Drilling

The Cleveland Jobber Drill 2075 is a fractional-inch cutting tool sized 17/64 inch with a decimal equivalent of .2656. It is manufactured from cobalt steel for high-performance drilling tasks. The right-hand cutting direction suits standard machine and hand-held operations. This drill serves machinists and maintenance technicians who require a durable bit for general-purpose metalwork.

Parabolic Flute and Notch Point Geometry

A 135-degree notch point reduces thrust and improves centring at the start of the cut. The parabolic flute profile promotes efficient chip evacuation in deeper holes. A straw-bronze finish identifies the cobalt substrate and provides a degree of lubricity. The straight shank matches the 17/64 diameter for direct chucking without a reduced shank adapter.

Limits of the Non-Coolant Through Design

The absence of coolant-through channels means heat builds up faster in prolonged or deep-hole drilling. Chip packing becomes more likely once the flute length of 2-7/8 inches is exceeded. Users must apply external flood or mist coolant and use peck cycles to maintain tool life. The bit is not suited for high-volume production runs that demand internal coolant delivery.