Cleveland C04544 Screw Machine Drill Bit Letter O Hss

Product Description

The CLEVELAND C04544 is a screw machine length (stub) drill bit sized to Letter O, equal to 0.3160 inches in diameter, designed for general-purpose drilling in metal fabrication and machining environments. Built from high-speed steel with a bright, uncoated finish, it features a standard 118-degree split point and a web-thinned, parallel-web construction that reduces thrust and improves chip clearance at entry. At 2-15/16 inches overall length with a 1-11/16-inch flute, this short-body geometry offers increased rigidity in close-tolerance setups. Machinists, tool-and-die technicians, and production shop personnel are the primary users.

The C04544 is suited for drilling alloy steel, aluminum, and similar workpiece materials in production and job-shop environments. Its screw machine length profile makes it well-matched for drill press, turret lathe, and CNC work-holding setups where a standard jobber-length bit would introduce unnecessary runout or deflection. The straight-cylindrical shank accepts standard three-jaw drill chucks without adapters. Two spiral flutes with a regular helix angle handle chip evacuation across a broad range of feed and speed combinations.

Key Features

• Letter O size — 0.3160 inches diameter, tolerance +0.0000 to -0.0010 inches per ASME B94.11M
• 118-degree standard point angle with web thinning reduces entry thrust
• Short screw machine length body (2-15/16 inches OAL) maximizes rigidity
• High-speed steel construction rated for general-purpose metal cutting
• Bright, uncoated finish suitable for use with cutting fluids
• Right-hand cut, straight-cylindrical shank — no coolant-through requirement

Compatibility

Designed as an OEM-style general-purpose screw machine drill bit compatible with any standard three-jaw chuck or collet system accepting a 0.3160-inch straight-cylindrical shank.

Installation Notes

Secure the shank fully in the chuck and verify runout before drilling. Power down and lock out the spindle before changing bits or adjusting workholding. Use an appropriate cutting fluid for the workpiece material to extend tool life. Follow machine manufacturer feed and speed recommendations for high-speed steel tooling in alloy and aluminum stock.