Cleveland C04612 Screw Machine Drill Bit 9/16 in Hss

Product Description

The CLEVELAND C04612 is a screw machine length drill bit designed for high-production drilling applications where rigidity and precision are required. Built from high-speed steel (HSS) with a bright, uncoated finish, this bit features a 9/16 inch diameter, a standard 118-degree split point, and a web-thinned tip that reduces thrust and improves centering at the start of a cut. The short overall length of 4 inches and straight-cylindrical shank make it well-suited for use in drill presses, CNC machining centers, lathes, and screw machine setups where a stub-length configuration reduces deflection and chatter.

This bit is intended for general-purpose drilling in alloy steel and aluminum in both light manufacturing and job-shop environments. The 2-flute right-hand spiral design provides efficient chip evacuation during through-hole and blind-hole operations. Machinists, tool-and-die makers, and maintenance mechanics working in metal fabrication, aerospace component production, or general industrial settings will find this bit appropriate for standard duty cycle applications across those materials.

Key Features

• 9/16 inch (0.5625 inch) diameter with a diameter tolerance of +0.0000 to -0.0012 inches for consistent hole sizing
• 118-degree standard point angle with web thinning for reduced entry thrust and improved self-centering
• High-speed steel construction provides heat resistance and edge retention suitable for alloy and aluminum stock
• Short screw machine length — 4 inches overall, 2.5 inch flute length — minimizes deflection in close-clearance setups
• Right-hand, 2-flute regular spiral with parallel web configuration for reliable chip clearance
• Meets ASME B94.11M standards for drill bit geometry and dimensional accuracy

Compatibility

Designed as a general-purpose replacement or production-stock drill bit for use in screw machines, drill presses, CNC lathes, and milling machines accepting a 0.5625 inch straight-cylindrical shank. Primary workpiece materials include alloy steel and aluminum as stated by the manufacturer.

Installation Notes

Installation and use should be performed by a qualified machinist or toolroom technician familiar with cutting tool setup. Secure the shank fully in a properly sized collet, chuck, or tool holder before operation, and verify runout before drilling. Always power down and de-energize the machine before changing bits. Do not exceed the recommended feed and speed parameters for the workpiece material and machine type.