Cleveland C04381 Screw Machine Drill Bit Wire 51 Hss

Product Description

The CLEVELAND C04381 is a screw machine length (stub-length) drill bit designed for general-purpose drilling in production and shop environments. Manufactured from high-speed steel with a bright, uncoated finish, it carries a wire gauge size of 51, equivalent to 0.0670 inches in decimal. The 118-degree standard point angle and web-thinned tip reduce entry force and help center the bit on the workpiece. At 1-11/16 inches overall length, the short flute design adds rigidity and minimizes deflection in drill press, turret lathe, and screw machine applications. A licensed HVAC tech, machinist, or tool-and-die professional will recognize this as a standard stub drill for close-tolerance work.

This bit is suited for drilling alloy steel and aluminum in both manual and automated setups. The straight-cylindrical shank at 0.0670 inches diameter seats directly in standard chucks and collets without adapters. The 11/16-inch flute length and 1-inch shank length keep the tool compact for tight clearance drilling. Regular spiral geometry provides efficient chip evacuation in through-hole and shallow-hole operations. Typical applications include production runs on CNC drill presses, manual drill presses, and turret lathes where stub-length rigidity is preferred over jobber-length reach.

Key Features

• Wire size 51 (0.0670 inches decimal) with diameter tolerance of +0.0000 to -0.0005 inches for close-fit hole production
• 118-degree standard point angle with web-thinned tip for reduced thrust and self-centering entry
• High-speed steel construction for heat resistance in ferrous and non-ferrous materials
• Bright, uncoated finish allows visual wear inspection during use
• Stub-length body (1-11/16 inches OAL) maximizes rigidity and minimizes deflection in screw machine and drill press setups
• Meets ASME B94.11M dimensional standards for consistent interchangeability

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard three-jaw chucks and collets accepting a 0.0670-inch straight-cylindrical shank. Intended for drilling alloy steel and aluminum workpieces per Series 2120 specifications.

Installation Notes

This bit is installed and operated by machinists, tool-and-die technicians, and production drilling professionals. Secure the straight shank fully in the chuck or collet and confirm runout before starting the spindle. Always match spindle speed to the workpiece material and bit diameter using a standard speeds-and-feeds reference. Wear appropriate eye protection and secure workpieces firmly before drilling.