Cleveland C04451 Screw Machine Drill Bit Wire 21 Hss

Product Description

The CLEVELAND C04451 is a screw machine length (stub length) drill bit designed for general-purpose drilling in production and machining environments. Manufactured from high-speed steel with a bright, uncoated finish, this bit features a 118-degree standard point angle and a web-thinned geometry that reduces thrust and improves chip evacuation. The wire gauge size 21 corresponds to a decimal diameter of 0.1590 inches. At 2.125 inches overall length, the short flute design improves rigidity and reduces deflection in short-reach drilling applications. Licensed machinists, toolroom techs, and CNC setup personnel are the typical end users.

This bit is suited for drilling alloy steels, aluminum, and similar materials on drill presses, CNC machining centers, turret lathes, and screw machines. The straight-cylindrical shank accepts standard three-jaw drill chucks and collet-style toolholders. The shortened body compared to jobber-length bits makes it well matched to high-production scenarios where rigidity matters more than reach. It is sold individually, with a minimum order quantity of 10 units per order.

Key Features

• Wire size 21 with 0.1590-inch decimal diameter and a tolerance of +0.0000 to -0.0007 inches
• 118-degree standard point angle with web-thinned, parallel-web configuration for reduced entry thrust
• High-speed steel construction with bright, uncoated finish — suitable for general-purpose metal cutting
• Screw machine (short) length at 2.125 inches overall for increased rigidity and reduced deflection
• Two-flute spiral design with 1.0625-inch flute length promotes chip clearance
• Meets ASME B94.11M dimensional standards

Compatibility

Designed as a general-purpose OEM-style screw machine drill bit compatible with standard straight-shank drill chucks and collet toolholders accepting a 0.1590-inch shank diameter across drill press, lathe, and CNC machining center applications.

Installation Notes

Installation and use should be performed by qualified machinists or tool-and-die personnel familiar with cutting tool setup and machine operation. Secure the shank fully in the chuck or collet and verify runout before engaging the workpiece. Always power down and lock out the machine before changing or inspecting tooling. Use appropriate cutting fluid or coolant for the workpiece material when extended drilling cycles are anticipated, even though this bit does not include through-coolant capability.