Chicago-latrobe 48405 Screw Machine Drill Bit Hss

Product Description

The CHICAGO-LATROBE 48405 is a screw machine length drill bit designed for high-production drilling in cast iron and steel. Built from high speed steel with a coated finish, it carries a 135-degree split point that reduces walking and lowers the thrust needed to start a hole. The web-thinned, parallel-web construction improves chip evacuation and extends tool life in heavy-duty applications. At 0.110 inches in diameter with an overall length of 1.875 inches and a flute length of 0.875 inches, this bit fits standard drill chucks and is sized to NAS 907 specification. Licensed machinists, tool-and-die technicians, and maintenance mechanics are the typical users.

The 48405 is suited for short-reach drilling operations where rigidity matters more than depth capacity. Its screw machine length body minimizes deflection in drill press, CNC turret, and automatic screw machine setups. Primary workpiece materials are cast iron and steel. The 2-flute regular spiral geometry handles chip clearance in through-holes and blind holes alike. Series 2159 from CHICAGO-LATROBE covers heavy-duty screw machine length bits built to ISO and NAS standards, making this bit a common choice in production shops and MRO environments.

Key Features

• 135-degree split point reduces thrust and eliminates center-punch marking on most metals
• Web-thinned, parallel-web design improves chip flow and reduces heat buildup
• High speed steel construction with coated finish for added wear resistance
• Screw machine length body provides extra rigidity and reduced deflection versus jobber-length bits
• Right-hand cut, 2-flute spiral geometry suits standard clockwise-rotation drilling equipment
• Diameter tolerance held to +0.0000 to -0.0005 inches for close-tolerance applications

Compatibility

Designed as an OEM-style production drill bit for use in standard drill chucks accepting straight-cylindrical shanks. Primary workpiece materials listed by the manufacturer are cast iron and steel.

Installation Notes

Secure the shank fully in the drill chuck and verify runout before beginning production runs. Always wear appropriate eye protection and use a work-holding fixture rated for the drilling force applied. Follow your shop's speed-and-feed tables for high speed steel tooling in cast iron and steel. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed to maintain dimensional accuracy.