Cleveland Golf Parabolic Cobalt Jobber Drill 1/4 In 135 Deg 2075

Precision Jobber Drill Bit

The Cleveland Golf Parabolic Cobalt Jobber Drill 1/4 In 135 Deg 2075 is a fractional-inch cutting tool for metalworking professionals and maintenance technicians. Its cobalt steel construction and 135-degree notch point suit high-performance drilling in tough alloys. The parabolic flute geometry aids chip evacuation during deep-hole operations. Right-hand cutting direction matches standard machine tooling.

Parabolic Flute Chip Limits

The parabolic flute design improves chip flow compared with standard twist drills, yet it has practical limits in extremely deep or interrupted cuts. Coolant is not fed through the tool, so external flood or mist cooling is required to manage heat in abrasive materials. The 135-degree point angle reduces walk on hard surfaces but demands rigid setups to prevent corner breakdown. Operators must match feed rates to the flute capacity.

Cobalt Steel Build Quality

Cobalt steel substrate retains hardness at elevated temperatures, extending tool life in stainless steel and high-tensile alloys. The straw/bronze finish indicates heat treatment rather than a coating, so edge integrity remains consistent after resharpening. A 1/4-inch straight shank fits standard drill chucks and collets without adapters. The 4-inch overall length and 2-3/4-inch flute length balance reach and rigidity for general shop use.