Cleveland Golf
Cleveland Golf Cobalt Jobber Drill #1 135° Parabolic .2280 2075
A cobalt steel jobber drill with a 135-degree parabolic flute for high-performance drilling in hard alloys, list number 2075
- TypeAngle, Pitch & Slope Locators
- Cobalt steel resists heat when drilling stainless steel
- 135-degree notch point starts cleanly in chilled cast iron
- Parabolic flutes lift chips from deep holes
- .2280 diameter matches #1 wire-gauge standard
- High-performance grade handles high-strength alloy and tool steels
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.
Highlights
- Cobalt steel resists heat when drilling stainless steel
- 135-degree notch point starts cleanly in chilled cast iron
- Parabolic flutes lift chips from deep holes
- .2280 diameter matches #1 wire-gauge standard
- High-performance grade handles high-strength alloy and tool steels
Specifications
| Brand | Cleveland |
|---|---|
| Type | Angle, Pitch & Slope Locators |
Questions about this item
When will the cobalt steel drill bit need replacing?
The cobalt steel construction resists heat and wear longer than standard high-speed steel, extending life when drilling chilled cast iron or stainless steel.
What limits continuous drilling with the 135° parabolic flute?
Chip evacuation through the 135° notch point and parabolic flute eventually slows if chips pack in deep holes without pecking cycles.
How much heat builds up during all-day use?
Cobalt steel dissipates heat better than conventional steel, keeping the 135° point cooler during sustained drilling in high-strength alloys.
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