Cleveland C04431 Screw Machine Drill Bit Wire 30 Hss

Product Description

The CLEVELAND C04431 is a screw machine length (stub length) drill bit sized to wire gauge No. 30, with a decimal diameter of 0.1285 inches. Built from high-speed steel with a bright uncoated finish, it features a 118-degree standard point angle and a two-flute right-hand spiral for efficient chip evacuation. The overall length is 1-15/16 inches with a 15/16-inch flute length, making it well suited for close-clearance drilling applications where a standard-length bit would be impractical. Web-thinned geometry reduces thrust and improves centering at entry. This bit is used by machinists, tool-and-die technicians, and general metalworking tradespeople.

The C04431 is a general-purpose bit intended for drilling alloy steel and aluminum in production and maintenance environments. Its short overall length and straight cylindrical shank make it compatible with standard drill chucks, CNC turrets, and screw machine tooling setups. It is particularly useful in applications requiring tight depth control or operation in confined work envelopes, such as tapping prep holes, pilot drilling, or production runs on automatic screw machines.

Key Features

• Wire gauge No. 30 diameter: 0.1285 inches with a tolerance of +0.0000 to -0.0007 inches
• High-speed steel construction for general-purpose ferrous and non-ferrous metal drilling
• 118-degree standard point angle with web-thinned geometry for reduced entry thrust
• Bright uncoated finish suitable for use with cutting fluids or dry
• Short screw machine length (1-15/16 inches OAL) for rigid, close-clearance setups
• Right-hand cut, two-flute spiral for standard chip clearance
• Conforms to ASME B94.11M dimensional standards

Compatibility

Designed as a general-purpose screw machine length drill bit for use in standard drill chucks and machine tooling that accepts a 0.1285-inch straight cylindrical shank. Primary workpiece materials listed by the manufacturer are alloy steel and aluminum.

Installation Notes

Install in a properly sized drill chuck or collet and verify runout before production use. Secure the workpiece firmly before drilling to prevent walking on entry, especially at this small diameter. Use an appropriate cutting fluid for alloy steel applications to extend tool life and maintain hole tolerance. Inspect the cutting edges before each use and replace bits that show chipping or excessive wear to stay within the stated diameter tolerance.