Cleveland Golf Cobalt Jobber Drill #1 135° Parabolic .2280 2075

Cobalt Jobber Drill #1

This cobalt steel jobber drill bit is sized at wire gauge #1 with a decimal equivalent of .2280 inches. It is engineered for drilling chilled cast iron, high-speed steel, high-strength alloy steel, stainless steel, and tool steels. The 135-degree notch point and parabolic flute geometry promote efficient chip evacuation in these hard materials. Right-hand cutting direction suits standard drilling operations.

Parabolic Flute and 135° Point

The parabolic flute design helps pull chips out of deep holes more effectively than standard flutes, reducing the risk of binding during extended drilling. A 135-degree split point reduces walking at the start of the cut and lowers thrust requirements. The straw/bronze finish identifies the cobalt heat treatment that maintains hardness at elevated temperatures. These features combine to extend tool life in tough alloys.

High-Performance Grade Construction

Built to a high-performance grade, the bit withstands the heat and abrasion generated by difficult-to-machine steels. The shank diameter matches the .2280-inch drill diameter for a consistent fit in standard drill chucks and collets. An overall length of 3-7/8 inches with a 2-5/8 inch flute length provides reach for typical jobber applications. Non-coolant-through design suits conventional machining setups.