Cleveland C04659 Screw Machine Drill Bit 59/64 in Hss

Product Description

The CLEVELAND C04659 is a screw machine length drill bit designed for high-volume drilling operations in metal fabrication, machining, and general industrial applications. Built from high-speed steel with a bright/uncoated finish, it measures 59/64 inch (0.9219 inch) in diameter with a 118-degree standard point angle and a 5.75-inch overall length. The shorter-than-jobber body length improves rigidity and reduces deflection in chuck-mounted setups, making it a reliable choice for production drilling where hole accuracy matters. Two spiral flutes with web thinning promote efficient chip evacuation and reduce thrust force at entry.

This bit is suited for drilling alloy steel, aluminum, and similar workpiece materials in light manufacturing, job shop, and maintenance environments. The straight cylindrical shank seats securely in standard drill chucks and CNC toolholders. At 59/64 inch diameter, it is commonly used where a close-to-1-inch bore is required without stepping up to a full 1-inch bit. The Series 2120 designation identifies this as a general-purpose screw machine length format conforming to ASME B94.11M standards.

Key Features

• 59/64 inch (0.9219 inch) diameter with a diameter tolerance of +0.0000 to -0.0012 inch for consistent hole sizing
• 118-degree standard point angle for general-purpose entry into alloy steel and aluminum
• Web-thinned parallel web construction reduces thrust and extends tool life
• Short screw machine length (5.75 inch OAL) increases rigidity versus standard jobber bits
• Straight cylindrical shank compatible with standard drill chucks and toolholders
• Bright/uncoated high-speed steel construction suitable for use with cutting fluid

Compatibility

Designed as a general-purpose screw machine length drill bit for use in drill presses, lathes, CNC machining centers, and handheld drill equipment accepting a straight cylindrical shank. Primary workpiece materials include alloy steel and aluminum.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or tooling technicians familiar with proper chuck torque and runout inspection procedures. Secure the shank fully in the chuck before operation and verify concentricity to minimize deflection at large diameters. Apply appropriate cutting fluid when drilling alloy steel to manage heat buildup and extend tool life. Inspect the cutting edge and web condition before each use and replace when wear affects hole diameter tolerance.