Chicago-latrobe 50898 Screw Machine Drill Bit 0.089 in Cobalt

Product Description

The CHICAGO-LATROBE 50898 is a cobalt screw machine length drill bit designed for high-performance drilling in tough materials including cast iron and steel. It measures 0.089 inches in diameter, equivalent to wire size 43, and features a 135-degree split point that reduces walking and cutting resistance on entry. The overall length is 1.75 inches with a flute length of 0.75 inches. Built to Series 559 heavy-duty standards, this bit is suited for machinists, tool-and-die technicians, and maintenance professionals who need consistent performance in short-length drilling applications.

This screw machine length drill bit is used in production and maintenance environments where compact bit geometry is required for close-tolerance drilling. Its shorter overall length provides added rigidity compared to jobber-length bits, making it well suited for drill presses, CNC machining centers, and turret lathes working in cast iron and steel workpieces. The right-hand spiral flute design promotes efficient chip evacuation in these materials.

Key Features

• Cobalt M42 material grade for heat resistance and extended tool life in ferrous metals
• 135-degree split point reduces thrust and eliminates center-punching in most applications
• Web-thinned parallel web construction for improved chip clearance and reduced torque
• Screw machine length provides greater rigidity than jobber-length bits
• Straight-cylindrical shank fits standard drill chucks without adapters
• Diameter tolerance held to +0.0000 to -0.0005 inches for close-fit hole requirements

Compatibility

Designed as a direct-fit screw machine length drill bit for use in standard drill chucks and collet systems accepting a straight-cylindrical shank. Suitable for drilling cast iron and steel workpieces per Series 559 application guidelines.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance technicians familiar with rotary cutting tools. Ensure the drill chuck or collet is fully secured and the workpiece is properly clamped before operation. Coolant-through is not supported on this bit, so external cutting fluid is recommended when drilling steel to manage heat buildup. Inspect the cutting edges for wear before each use and replace the bit when diameter tolerance or point geometry can no longer be maintained.