Chicago-latrobe 48204 Screw Machine Drill Bit 1/16 in

Product Description

The CHICAGO-LATROBE 48204 is a screw machine length drill bit designed for heavy-duty drilling in cast iron and steel. Built from high speed steel (HSS) with a coated finish, it measures 1/16 inch (0.0625 inches) in diameter and 1-5/8 inches in overall length. The 135-degree split point reduces walking and improves hole entry without a center punch. A web-thinned, parallel web configuration lowers thrust and extends tool life in production environments. Licensed machinists, maintenance mechanics, and metal fabricators are the primary users of this bit.

This bit is suited for screw machine operations, short-hole drilling, and high-cycle production runs where a stubby, rigid tool is preferred over jobber-length bits. The reduced length minimizes deflection when drilling small-diameter holes in ferrous materials. Primary workpiece materials include cast iron and steel. Its straight-cylindrical shank fits standard drill chucks without adapters, making it compatible with drill presses, CNC machining centers, and handheld power drills used in tight-clearance applications.

Key Features

• 135-degree split point reduces thrust and eliminates center-punch requirements
• Web-thinned parallel web lowers cutting resistance and heat buildup
• Screw machine (stub) length provides rigidity and minimizes deflection in small-diameter drilling
• High speed steel construction with coated finish for extended tool life in ferrous materials
• Regular spiral flute with right-hand cut for standard chip evacuation
• Diameter tolerance of +0.0000 to -0.0005 inches ensures close-tolerance hole sizing

Compatibility

Designed for drilling cast iron and steel workpieces; fits any standard drill chuck accepting a straight-cylindrical shank. Meets NAS 907 specification under NAS designation and is manufactured to ISO standards.

Installation Notes

Install in a properly rated drill chuck and verify chuck jaws are fully tightened before operation. Always wear appropriate eye protection and secure the workpiece before drilling. Disconnect or de-energize machinery before changing bits. Use appropriate cutting fluid for steel applications to manage heat and extend bit life.