Chicago-latrobe 48544 Screw Machine Drill Bit 11/16 in Hss

Product Description

The CHICAGO-LATROBE 48544 is a screw machine length drill bit designed for general-purpose drilling in cast iron, non-ferrous metals, and steel. With an 11/16 inch (0.6875 inch) diameter and a 118-degree standard point angle, it delivers fast, accurate hole entry across a wide range of workpiece materials. The high speed steel construction is coated for added wear resistance. The web-thinned, parallel web design reduces thrust during entry and is well suited for production drilling environments where shorter flute-to-overall-length ratios improve rigidity and control.

Screw machine length drill bits are shorter than jobber-length bits, making them the standard choice when rigidity matters more than reach. The 48544 fits manual drill presses, CNC machining centers, and hand-held power tools using a straight cylindrical shank. It is used in machine shops, fabrication facilities, and maintenance environments where repeatable, clean holes are required in cast iron, aluminum, brass, and mild to medium carbon steel. The 2-7/8 inch flute length provides adequate chip clearance for typical through-hole and blind-hole applications at this diameter.

Key Features

• 11/16 inch (0.6875 inch) diameter with a tight tolerance of +0.0000 to -0.0012 inch for accurate hole sizing
• 118-degree standard point angle for general-purpose entry into ferrous and non-ferrous materials
• Web-thinned parallel web reduces cutting thrust and improves centering on entry
• High speed steel construction with coating for extended tool life in production use
• Straight cylindrical shank fits standard drill chucks without adapters
• 2-flute regular spiral design promotes chip evacuation in most common workpiece materials

Compatibility

Designed for use in standard drill press chucks, CNC turret lathes, and hand-held power tool chucks that accept a straight cylindrical shank at 11/16 inch diameter. Compatible with workpiece materials including cast iron, non-ferrous metals, and steel as specified in the product data for Series 157.

Installation Notes

Secure the shank fully in the chuck and verify runout before beginning a cut. Ensure the workpiece is clamped or fixtured to prevent movement. Apply appropriate cutting fluid or coolant for the workpiece material to manage heat, particularly in steel. Inspect the cutting edges and web for wear or chipping before each use and replace the bit when diameter tolerance or surface finish degrades.