Chicago-latrobe 48754 Screw Machine Drill Bit 0.055 in Hss

Product Description

The CHICAGO-LATROBE 48754 is a screw machine length drill bit designed for high-speed steel drilling in tight-clearance and production environments. At 0.055 inches (Wire Size 54) in diameter, this bit runs a 118-degree standard point angle with a web-thinned tip that reduces thrust and improves centering on entry. The bright, uncoated HSS construction handles general-purpose drilling in cast iron, non-ferrous metals, and steel without the overhead of coated tooling. Overall length is 1.625 inches with a 0.625-inch flute length, keeping the tool rigid in screw machine and short-hole applications. Machinists, tool-and-die techs, and production drilling setups are the primary users.

This bit is suited for screw machine operations, turret lathe setups, and benchtop drill press work where a short, stiff bit is required to hold tolerance in small-diameter holes. The straight-cylindrical shank seats directly in standard drill chucks and collet holders. Primary workpiece materials are cast iron, non-ferrous metals, and steel. General-purpose grade makes it a solid everyday tool for production shops, maintenance trades, and fabrication benches. Right-hand spiral flute geometry clears chips efficiently in through-hole and blind-hole drilling at typical production feed and speed rates.

Key Features

• Wire Size 54 diameter (0.055 inches) with a tight tolerance of +0.0000 to -0.0005 inches
• 118-degree standard point angle with web-thinned tip for reduced entry thrust
• High speed steel construction rated for cast iron, non-ferrous metals, and steel
• Bright, uncoated finish for general-purpose use without coating overhead
• Short screw machine length (1.625 inches overall) for rigidity in close-clearance setups
• Regular spiral, two-flute design promotes chip evacuation in production drilling

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit compatible with standard straight-cylindrical shank drill chucks and collet holders sized for small-diameter tooling. Series 157 general-purpose grade suits a broad range of production and maintenance drilling applications in cast iron, non-ferrous metal, and steel workpieces.

Installation Notes

This bit is installed by machinists and tool-room technicians in drill presses, screw machines, or turret lathes equipped with a compatible chuck or collet. Secure the straight-cylindrical shank firmly before operation and verify spindle runout is within tolerance for small-diameter work, as undersized bits are sensitive to side load and chatter. Always use appropriate cutting fluid or coolant for the workpiece material unless the setup specifically calls for dry drilling. Follow applicable shop safety standards and machine guarding requirements when running production drilling cycles.