Chicago-latrobe 48812 Screw Machine Drill Bit 0.29 in Hss

Product Description

The CHICAGO-LATROBE 48812 is a screw machine length drill bit designed for high-volume drilling in metalworking and mechanical assembly applications. Built from high speed steel (HSS) with a bright, uncoated finish, it carries a 118-degree standard point angle and a web-thinned tip for reduced entry force and improved chip clearing. The straight-cylindrical shank seats cleanly in standard drill chucks. At 2.75 inches overall length, this stub-style bit provides added rigidity over jobber-length tooling, making it well suited for close-tolerance work on drill presses, CNC turret machines, and manual screw machines. It is sized to Letter L, equivalent to 0.29 inches decimal, with a diameter tolerance of +0.0000 to -0.0010 inches.

This bit is intended for general purpose drilling in cast iron, non-ferrous metals, and steel. The shorter flute length of 1.5625 inches limits deflection and increases stability in production drilling environments. It is a standard Series 157 offering, appropriate for shops and field technicians who require a consistent, general-purpose stub drill for repetitive hole operations. It conforms to ISO standards and is sold individually.

Key Features

• High speed steel construction for general purpose metal drilling
• 118-degree standard point angle with web-thinned tip for reduced thrust and cleaner entry
• Screw machine (stub) length at 2.75 inches overall for increased rigidity
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Bright uncoated finish — no coating buildup to affect dimensional accuracy
• Diameter tolerance of +0.0000 to -0.0010 inches for close-tolerance work

Compatibility

Designed for use in cast iron, non-ferrous metals, and steel. Fits standard drill chucks and collet systems accepting a straight-cylindrical shank. Suitable for drill presses, manual screw machines, and CNC turret drilling applications requiring a stub-length bit in the Letter L (0.29 inch) size range.

Installation Notes

Installation and use should be performed by machinists or qualified mechanical technicians familiar with metal cutting operations. Secure the shank fully in the chuck or collet before applying power. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Follow OSHA and machine-specific safety guidelines for rotating tooling, including appropriate eye protection and chip guarding.