Chicago-latrobe 48747 Screw Machine Drill Bit Hss

Product Description

The CHICAGO-LATROBE 48747 is a screw machine length drill bit designed for high-volume, close-tolerance drilling in metalworking and fabrication applications. Built from high speed steel with a bright/uncoated finish, this bit measures 0.0785 inches in diameter (Wire Size 47) and carries an overall length of 1.75 inches with a 0.75-inch flute length. The 118-degree standard point angle and web-thinned, parallel web configuration reduce entry force and improve centering on hard substrates. It is installed by machinists, tool-and-die technicians, and general fabrication tradespeople working with drill presses, CNC turret lathes, and screw machines.

This bit is suited for drilling cast iron, non-ferrous metals, and steel in production and general-purpose shop environments. The screw machine length profile — shorter than jobber length — provides added rigidity and reduced deflection in tight setups and gang-drilling fixtures. Right-hand spiral flute geometry clears chips efficiently during through-hole and blind-hole operations. General-purpose grade makes it a reliable option for standard production runs where tooling turnover is expected.

Key Features

• Wire Size 47 diameter (0.0785 inches) with a tight tolerance of +0.0000 to -0.0005 inches
• 118-degree standard point angle with web-thinned, parallel web for reduced thrust and improved self-centering
• High speed steel construction for general-purpose performance across ferrous and non-ferrous materials
• Screw machine (stub) length for increased rigidity and reduced deflection in confined setups
• Regular spiral, 2-flute design promotes efficient chip evacuation
• Bright/uncoated finish — no coating buildup to affect diameter tolerance in precision applications

Compatibility

Designed as a general-purpose replacement or production-stock drill bit for use with standard straight-shank drill chucks in screw machines, drill presses, and CNC turret equipment. Compatible with cast iron, non-ferrous metal, and steel workpieces per Series 157 design intent. Meets ISO standards.

Installation Notes

Install into a properly sized straight-shank chuck and confirm secure seating before operation. Machinists and fabrication tradespeople should verify spindle speed is appropriate for the workpiece material and bit diameter before drilling. Do not exceed the rated cutting envelope for the workpiece material — cast iron and steel each require different feed rates and speeds. Inspect the cutting edges for wear or chipping between uses, as small-diameter bits at this size range are sensitive to overloading.