Chicago-latrobe 48927 Screw Machine Drill Bit 27/64 Hss

Product Description

The CHICAGO-LATROBE 48927 is a screw machine length drill bit designed for left-hand cutting in general-purpose drilling applications. Built from high-speed steel (HSS) with a bright, uncoated finish, it measures 27/64 inch (0.4219 inch) in diameter with a 118-degree point angle and a standard point geometry. The overall length is 3-3/8 inches, making it a compact stub-length tool suited for close-quarter drilling where a jobber-length bit would be impractical. The two-flute, regular spiral configuration with web thinning provides efficient chip evacuation and reduced thrust. Straight shank design fits standard drill chucks without adapters.

This bit is rated for general-purpose use and is listed by the manufacturer for use in aluminum, copper, magnesium, slate, thermoplastic, and wood. The left-hand cutting direction makes it particularly useful for extracting broken right-hand fasteners — as the drill engages, the reverse rotation often backs out the fastener before full drilling is needed. Machinists, maintenance technicians, and trade professionals working with screw machine setups or drill presses will find this bit useful for bolt extraction and standard drilling in non-ferrous and softer materials.

Key Features

• Left-hand cut direction assists in broken fastener removal during reverse-rotation drilling
• HSS construction provides durability across non-ferrous metals, thermoplastics, and wood
• Screw machine (stub) length at 3-3/8 inches OAL reduces deflection in close-tolerance drilling
• 118-degree standard point angle with web thinning for reduced drill thrust and cleaner entry
• Bright, uncoated finish — no coating buildup, straightforward regrinding when needed
• ISO-standard tolerances: diameter held to +0.0000 to -0.0010 inch

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard straight-shank drill chucks. Listed for use in aluminum, copper, magnesium, slate, thermoplastic, and wood workpiece materials per manufacturer specifications.

Installation Notes

Install in a compatible straight-shank drill chuck and secure firmly before operation. When using for fastener extraction, confirm the drill is set to reverse rotation before engaging the workpiece. Wear appropriate eye protection and secure the workpiece to prevent rotation. Inspect the cutting edges before each use and regrind or replace if chipping or wear is evident.