Chicago-latrobe 48929 29/64 in Hss Screw Machine Drill Bit

Product Description

The CHICAGO-LATROBE 48929 is a screw machine length drill bit designed for left-hand cutting in general-purpose drilling applications. It is manufactured from high-speed steel (HSS) with a bright, uncoated finish and carries a 118-degree standard point angle. The shortened screw machine length body — 3-9/16 inches overall — provides added rigidity and is suited for use in drill presses, lathes, and CNC equipment where stub-length tooling is preferred. The straight shank diameter matches the drill diameter at 0.4531 inches, and the web is thinned to reduce thrust and improve chip evacuation. This bit is typically installed by machinists, tool-and-die professionals, and maintenance technicians.

The 48929 is built for drilling aluminum, copper, magnesium, thermoplastic, wood, and slate. The left-hand cutting direction makes it particularly useful for removing broken right-hand fasteners, studs, and socket-head cap screws — the bit tends to back the fastener out as it cuts. It is appropriate for light industrial and maintenance environments where general-purpose hole-making in soft to medium materials is routine. The 2-flute regular spiral configuration supports consistent chip flow in the materials listed above.

Key Features

• Left-hand cut removes broken right-hand fasteners while drilling
• HSS construction with bright uncoated finish for general-purpose use
• 118-degree standard point angle with web thinning to reduce entry thrust
• Screw machine (stub) length at 3-9/16 inches overall for improved rigidity
• Straight shank at 0.4531 inches diameter for standard chuck compatibility
• ISO standard compliance; diameter tolerance held to +0.0000 to -0.0010 inches

Compatibility

Designed as a general-purpose screw machine length drill bit suited for use in standard 3-jaw chucks, drill press chucks, and lathe tailstocks accepting straight-shank tooling at 0.4531 inches shank diameter. Listed primary workpiece materials include aluminum, copper, magnesium, slate, thermoplastic, and wood.

Installation Notes

Installation is performed by machinists or maintenance technicians familiar with rotating cutting tools. Secure the straight shank fully in the chuck before operation and confirm the chuck is tightened with all drive positions. Left-hand bits require the spindle to run in reverse relative to standard right-hand bits — verify spindle direction before engaging the workpiece. Always wear appropriate eye protection and follow machine-guarding requirements per applicable OSHA and shop safety standards.