Cleveland C04509 Screw Machine Drill Bit Letter E Hss

Product Description

The CLEVELAND C04509 is a screw machine length drill bit sized at Letter E (0.25 inches decimal) with a 118-degree standard point angle. Built from high-speed steel (HSS) with a bright, uncoated finish, it is engineered for general-purpose drilling in metal fabrication, machining, and repair work. The short overall length of 2.5 inches provides added rigidity and reduced deflection compared to jobber-length bits, making it well suited for drill press and CNC turret work where hole accuracy is critical. Two right-hand spiral flutes evacuate chips efficiently through the cut. The parallel web configuration and web-thinned geometry reduce thrust requirements when entering the workpiece.

This bit is used in short-run and production drilling applications on alloy steel and aluminum workpieces. The screw machine length format is a standard choice for turret lathes, CNC machining centers, and bench drill presses where a shorter, stiffer bit is preferred over a jobber-length drill. It is appropriate for trade machinists, tool-and-die technicians, maintenance mechanics, and millwrights performing general metal removal tasks. The straight cylindrical shank fits standard three-jaw chucks and collet holders sized to 0.25 inches.

Key Features

• Letter E size (0.25 inches) with a diameter tolerance of +0.0000 to -0.0007 inches for close-tolerance hole sizing
• 118-degree standard point angle suitable for general-purpose drilling in ferrous and non-ferrous metals
• High-speed steel construction provides adequate heat resistance for intermittent and low-speed drilling
• Short screw machine length (2.5 inches OAL) increases rigidity and reduces deflection in production setups
• Web-thinned geometry lowers drilling thrust and improves chip flow at entry
• Meets ASME B94.11M standards for drill bit dimensional compliance

Compatibility

Designed as a general-purpose screw machine length drill bit for use in standard 0.25-inch chucks and collet systems on drill presses, turret lathes, and CNC machining centers. Primary workpiece materials listed by the manufacturer include alloy steel and aluminum.

Installation Notes

Secure the shank fully in a properly sized chuck or collet before operation and verify chuck key is removed before spindle engagement. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting that this bit does not support coolant-through delivery. Inspect the cutting edges for wear or chipping before each use. Follow applicable machine guarding and PPE requirements per OSHA 1910.212 when operating drill press or lathe equipment.