Chicago-latrobe 48219 Screw Machine Drill Bit 19/64 in

Product Description

The CHICAGO-LATROBE 48219 is a screw machine length drill bit designed for high-production drilling in ferrous metals, including cast iron and steel. Built from high speed steel with a coated finish, it delivers durability and heat resistance in heavy-duty applications. The 135-degree split point reduces walking and lowers thrust requirements, allowing faster penetration without a center punch. At 19/64 inch (0.2969 inches) in diameter, it features a parallel web configuration with web thinning for improved chip evacuation and consistent hole quality across repeated cuts.

Screw machine length drill bits are shorter than jobber-length bits, providing added rigidity and reduced deflection in drill press, turret lathe, and CNC screw machine setups. The 48219 is suited for production environments where tight tolerances and repeatability are required. Its straight-cylindrical shank seats securely in standard three-jaw chucks and collet-style toolholders. Primary workpiece materials include cast iron and steel, making it a practical choice for machine shops, maintenance facilities, and fabrication operations.

Key Features

• 135-degree split point reduces bit walking and cutting thrust on hard ferrous materials
• Web-thinned parallel web improves chip flow and reduces heat buildup at the cutting edge
• Screw machine length body provides extra rigidity and minimizes deflection in short-hole applications
• High speed steel construction with coated finish for extended tool life in steel and cast iron
• Regular spiral flute with right-hand cut for standard clockwise-rotation tooling setups
• Diameter tolerance held to +0.0000 to -0.0010 inches for precise, repeatable hole sizing

Compatibility

Designed for use in standard drill presses, CNC machining centers, turret lathes, and screw machines equipped with three-jaw chucks or collet holders accepting a straight-cylindrical shank. Primary workpiece materials are cast iron and steel.

Installation Notes

Installation and use should be performed by a qualified machinist or tool-and-die technician familiar with proper feeds and speeds for high speed steel tooling. Secure the shank fully in the chuck or collet before operation to prevent runout. Ensure the workpiece is firmly clamped before drilling to avoid bit breakage or injury. Coolant-through is not supported on this bit; apply cutting fluid externally at the drill point when working in steel to manage heat.