Chicago-latrobe 48554 Screw Machine Drill Bit 27/32 in

Product Description

The CHICAGO-LATROBE 48554 is a screw machine length drill bit designed for high-production drilling in metal fabrication and machining environments. Built from high speed steel with a coated finish, this 27/32 inch (0.8438 inch decimal) bit features a 118-degree point angle, two spiral flutes, and a straight-cylindrical shank. The shorter screw machine length body improves rigidity and reduces deflection compared to jobber-length bits, making it a reliable choice for close-tolerance work on drill presses and CNC equipment. A web-thinned tip reduces thrust requirements when starting holes and helps maintain accuracy in moderate to high production runs.

This drill bit is suited for general purpose drilling in cast iron, non-ferrous metals, and steel. The Series 157 designation places it in a well-established line of screw machine bits used in production shops, maintenance facilities, and job shops. Its parallel web configuration and regular spiral type handle a broad range of ferrous and non-ferrous workpiece materials without specialized tooling or setup. Licensed machinists and industrial maintenance technicians are the typical end users, though experienced fabricators also reach for this size in structural and mechanical applications.

Key Features

• 27/32 inch diameter with a decimal size of 0.8438 inches and a tight tolerance of +0.0000 to -0.0012 inches
• 118-degree standard point angle with web-thinned tip for reduced thrust on entry
• High speed steel construction with coated finish for improved wear resistance
• Screw machine length body increases rigidity and reduces deflection during drilling
• Two spiral flutes with parallel web configuration for efficient chip evacuation
• Right-hand cut, straight-cylindrical shank compatible with standard drill chucks and holders

Compatibility

Designed as a general purpose screw machine length drill bit for use in cast iron, non-ferrous metal, and steel workpieces. Compatible with standard drill chucks and tool holders accepting a straight-cylindrical shank in the 27/32 inch size range.

Installation Notes

Install and remove this bit with the drill press or machine powered off and the spindle fully stopped. Secure the straight shank firmly in the chuck or collet to the full depth of the shank engagement to prevent slipping under load. Machining professionals should confirm appropriate spindle speed and feed rate for the workpiece material and bit diameter before cutting. Cutting fluid or coolant is recommended for steel applications to extend tool life, even though this bit does not feature a coolant-through design.