Cleveland C03108 Jobber Drill Bit Letter O Hss

Product Description

The CLEVELAND C03108 is a jobber-length twist drill bit sized to Letter O (0.3160 inches) and manufactured from high speed steel with a bright, uncoated finish. Designed for general-purpose drilling, it features a 118-degree standard point angle and a fast spiral flute configuration with web thinning for improved chip evacuation and reduced thrust. The straight-cylindrical shank seats securely in standard drill chucks, making this bit a reliable choice for machine shop work, maintenance, and fabrication. It is installed and used by machinists, maintenance technicians, and metal fabricators working across a range of production and repair applications.

The C03108 is suited for drilling aluminum and other non-ferrous metals as its primary workpiece material, though its general-purpose grade makes it functional across a broad range of softer metals and plastics. With a 5.75-inch overall length and a 3.188-inch flute length, it provides adequate reach for most standard jobber-length applications. The two-flute spiral design promotes efficient chip clearance during through-hole and blind-hole drilling operations on drill presses, lathes, and hand-held power drills.

Key Features

• Letter O size at 0.3160 inches diameter with a tight tolerance of -0.0010 to 0.0000 inches
• 118-degree standard point angle for general-purpose drilling versatility
• Fast spiral, two-flute design with tapered web for efficient chip removal
• Web-thinned tip reduces cutting resistance and entry thrust
• Bright uncoated high speed steel construction for easy visual wear inspection
• Straight-cylindrical shank compatible with standard drill chucks
• Conforms to ASME B94.11M standards under ANSI specification designation

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit suitable for use in standard drill chucks on drill presses, CNC drilling machines, lathes, and hand-held power drills where a Letter O or 0.3160-inch diameter hole is required.

Installation Notes

Installation is performed by machinists and maintenance technicians using standard drill chuck tooling. Ensure the drill press or machine spindle is powered down and brought to a full stop before inserting or removing the bit from the chuck. Secure the shank fully in the chuck and confirm concentricity before beginning a cut. Follow applicable shop safety standards and use appropriate cutting fluid or lubrication when drilling ferrous materials to extend tool life.