Cleveland C04398 Screw Machine Drill Bit Wire 44 Hss

Product Description

The CLEVELAND C04398 is a screw machine length (stub length) drill bit sized to wire gauge 44, equivalent to 0.0860 inches in diameter. Built from high-speed steel with a bright, uncoated finish, this bit features a 118-degree standard point angle and a web-thinned geometry that reduces thrust and improves chip evacuation at entry. Overall length is 1.75 inches with a 0.75-inch flute length, making it well suited for tight-clearance drilling in drill presses, CNC machining centers, and screw machine applications. The straight cylindrical shank and right-hand spiral cut are standard for general-purpose production drilling. Licensed machinists, tool and die professionals, and manufacturing maintenance technicians are the primary installers.

This drill bit is designed for drilling alloy steels and aluminum in production and light manufacturing environments. The short body length improves rigidity and reduces deflection when drilling small-diameter holes in close-tolerance work. It fits any standard drill chuck accepting a 0.0860-inch straight shank. Typical applications include tapping pilot holes, clearance holes for small fasteners, and precision hole work on machined components where runout control and hole location accuracy are required.

Key Features

• Wire size 44 (0.0860 inches) straight cylindrical shank for standard chuck compatibility
• 118-degree standard point angle with web-thinned geometry reduces entry thrust
• High-speed steel construction handles alloy steel and aluminum at general-purpose cutting speeds
• Screw machine (stub) length body at 1.75 inches overall improves rigidity and reduces deflection
• Bright, uncoated finish allows visual wear inspection during service
• Diameter tolerance of plus 0.0000 to minus 0.0005 inches for consistent hole sizing
• Conforms to ASME B94.11M standards for drill bit geometry and dimensions

Compatibility

Designed as a general-purpose screw machine length drill bit for use in drill presses, CNC machining centers, and manual screw machines accepting a 0.0860-inch straight cylindrical shank. Primary workpiece materials are alloy steel and aluminum per manufacturer specification.

Installation Notes

This drill bit is installed and used by machinists, tool room technicians, and manufacturing maintenance personnel. Secure the shank fully in the drill chuck and verify concentricity before running. Apply appropriate cutting fluid for the workpiece material to extend tool life and maintain hole tolerance. Inspect the cutting edges for wear or chipping before each use and replace the bit when the point geometry is compromised to avoid oversized or off-location holes.