Cleveland C04619 Screw Machine Drill Bit 39/64 in Hss

Product Description

The CLEVELAND C04619 is a screw machine length (stub length) drill bit designed for general-purpose drilling in metal fabrication, machining, and maintenance applications. It is manufactured from high-speed steel with a bright, uncoated finish and features a standard 118-degree split point with web thinning for improved center-starting performance. The bit measures 39/64 inch (0.6094 inches) in diameter with an overall length of 4.25 inches and a flute length of 2.75 inches. The shorter body compared to jobber-length bits provides increased rigidity, which reduces deflection and chatter in drill press and CNC turret applications. Licensed machinists, tool-and-die workers, and maintenance mechanics are the primary users of this series.

The C04619 is suited for drilling alloy steel and aluminum in production and repair environments. Its straight cylindrical shank fits standard drill chucks without the need for adapters. The shorter overall length makes it well-suited for tight-clearance fixtures, multi-spindle drill heads, and turret lathes where a jobber-length bit would flex or interfere. The right-hand cutting direction is compatible with all standard clockwise-rotating spindles. The Series 2120 designation identifies this as part of Cleveland's general-purpose screw machine drill line, built to ASME B94.11M standards.

Key Features

• 39/64 inch (0.6094 inches) diameter with a tight tolerance of +0.0000 to -0.0012 inches
• 118-degree standard point angle with web thinning for reliable center engagement
• High-speed steel construction — handles moderate heat in steel and aluminum drilling
• Short screw machine length (4.25 inches OAL) provides greater rigidity than jobber bits
• Two-flute spiral design with parallel web configuration for efficient chip evacuation
• Meets ASME B94.11M dimensional standards

Compatibility

Designed as a general-purpose screw machine length drill bit suitable for use in drill presses, CNC turrets, multi-spindle heads, and manual drill chucks that accept a 39/64 inch straight cylindrical shank. Primary workpiece materials listed by the manufacturer are alloy steel and aluminum.

Installation Notes

Secure the shank fully in the drill chuck before operation and verify chuck key is removed before powering the spindle. Use appropriate cutting fluid or lubricant when drilling steel to extend bit life and maintain hole tolerance. Inspect the cutting edges before each use — a dull bit generates excess heat and can damage the high-speed steel temper. Drill speed and feed rate should be selected based on workpiece material hardness; consult published speeds-and-feeds tables for HSS tooling in alloy steel and aluminum.