Cleveland C04478 Screw Machine Drill Bit Wire 8 Hss

Product Description

The CLEVELAND C04478 is a screw machine length (stub length) twist drill bit designed for high-volume drilling operations in metalworking and fabrication environments. Manufactured from high-speed steel (HSS), this wire gauge No. 8 bit measures 0.1990 inches in diameter with an overall length of 2.25 inches. The 118-degree standard point angle provides reliable centering on most metals without the need for a center punch in many setups. The bright, uncoated finish makes it easy to inspect the cutting edge after resharpening, and the web-thinned geometry reduces thrust force at the point for cleaner entry.

This bit is suited for general-purpose drilling in alloy steels, aluminum, and similar workpiece materials. The short flute length and stub overall length give it added rigidity compared to jobber-length bits, making it a preferred choice in screw machines, drill presses, and CNC turret setups where chatter and deflection are concerns. It is commonly used by machinists, tool-and-die shops, and fabrication facilities performing repetitive hole operations in metal stock.

Key Features

• Wire gauge No. 8 diameter: 0.1990 inches with a tight tolerance of +0.0000 to -0.0007 inches
• 118-degree standard point angle with web-thinned geometry for reduced thrust and cleaner entry
• High-speed steel construction for general-purpose metal drilling
• Bright, uncoated finish allows easy visual inspection and is resharpenable
• Straight-cylindrical shank (0.1990 inches) fits standard drill chucks without adapters
• Short stub length (2.25 inches OAL) increases rigidity and reduces deflection in fixed setups
• 2-flute regular spiral design; right-hand cut; ASME B94.11M compliant

Compatibility

Designed as a general-purpose screw machine length drill bit in Series 2120, suited for use in screw machines, CNC turrets, and drill presses where a 0.1990-inch straight-shank stub bit is required. Primary workpiece materials listed by the manufacturer include alloy steel and aluminum.

Installation Notes

This bit is installed and replaced by machinists or tool crib personnel operating drill presses, CNC lathes, or screw machines. Always secure the straight-cylindrical shank firmly in a properly sized drill chuck or collet before operation. Inspect the cutting edges and web condition before each use and resharpen or replace when dulling is evident. Follow your machine's speed and feed tables for the workpiece material to avoid overheating the HSS cutting edges.