Chicago-latrobe 48712 Screw Machine Drill Bit 0.189in Hss

Product Description

The CHICAGO-LATROBE 48712 is a screw machine length drill bit designed for high-volume, close-tolerance drilling in metalworking and fabrication applications. Manufactured from high speed steel with a bright/uncoated finish, this bit carries a 118-degree standard point angle and a two-flute regular spiral configuration. At 0.189 inches in diameter (wire size 12), it runs shorter than jobber-length bits, which reduces deflection and improves hole accuracy in production drilling environments. The web-thinned, parallel-web construction lowers entry resistance and helps maintain point geometry through repeated use. Licensed tradespeople and machinist-level technicians are the primary installers.

This bit is suited for general purpose drilling in cast iron, non-ferrous metals, and steel. Its screw machine length makes it a practical choice for drill press work, CNC turret operations, and manual production setups where a shorter flute and overall length provide added rigidity. The straight-cylindrical shank seats securely in standard three-jaw chucks and collet-style holders without modification. It performs across light manufacturing, HVAC sheet metal, plumbing rough-in metalwork, and electrical panel fabrication where consistent hole diameter tolerance is required.

Key Features

• Wire size 12 diameter of 0.189 inches with a tight tolerance of +0.0000 to -0.0007 inches
• High speed steel construction rated for general purpose cutting in cast iron, non-ferrous metal, and steel
• 118-degree standard point angle with web-thinned tip for reduced entry force
• Screw machine length body minimizes deflection compared to jobber-length alternatives
• Bright/uncoated finish suitable for use with cutting fluid or dry in lower-speed applications
• Right-hand cut, regular spiral flute with straight-cylindrical shank for universal chuck compatibility

Compatibility

Designed as a general purpose screw machine length drill bit compatible with standard three-jaw chucks and collet holders accepting a straight-cylindrical shank at 0.189 inches diameter. Conforms to ISO standards per Series 157 specifications.

Installation Notes

Install in a drill press, lathe tailstock, or CNC turret with a properly sized chuck or collet. Secure the shank fully before operation and verify chuck runout is within acceptable limits to preserve diameter tolerance. Apply appropriate cutting fluid when drilling steel or cast iron to extend tool life and maintain hole quality. Follow applicable shop safety protocols and machine guarding requirements during operation.