Cleveland C03086 Jobber Length Drill Bit Letter I Hss

Product Description

The CLEVELAND C03086 is a jobber length drill bit sized to letter I, equal to 0.272 inches in decimal, manufactured from high speed steel with a bright uncoated finish. The bit features a standard 118-degree drill point angle and a fast spiral flute geometry designed for efficient chip evacuation during through-hole and blind-hole drilling operations. With an overall length of 4.125 inches and a flute length of 2.875 inches, this bit handles general-purpose drilling tasks in metal fabrication, maintenance, and light manufacturing environments. It is installed and used by machinists, millwrights, and general maintenance technicians.

This drill bit is suited for drilling aluminum and similar non-ferrous and ferrous materials in general-purpose applications. The straight cylindrical shank fits standard three-jaw drill chucks on handheld drills, drill presses, and CNC machines. The web-thinned, tapered web design reduces thrust force at the cutting tip, making it a practical choice for production drilling where operator fatigue and feed pressure matter. It is sold individually and is appropriate for both shop and field use.

Key Features

• Letter I size (0.272 inches) with a diameter tolerance of -0.0010 to 0.0000 inches for consistent hole sizing
• 118-degree standard point angle suited for general-purpose drilling in aluminum and similar materials
• Fast spiral flute promotes efficient chip removal and reduces heat buildup during drilling
• Web-thinned tapered web reduces cutting resistance and required feed force
• Bright uncoated high speed steel construction compatible with cutting fluids and oils
• Straight cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose jobber length drill bit conforming to ASME B94.11M and ANSI specification designation, fitting standard three-jaw drill chucks accepting a 0.272-inch straight cylindrical shank.

Installation Notes

A licensed machinist or qualified maintenance technician should secure the shank fully in the drill chuck before operation and verify chuck tightening with a chuck key where applicable. Power down the drill or press and disconnect from the power source before changing bits. Apply an appropriate cutting fluid when drilling ferrous materials to extend tool life and improve hole finish. Inspect the cutting edges for wear or chipping before each use and replace the bit if the point geometry is compromised.