Chicago-latrobe 50807 Cobalt Screw Machine Drill Bit

Product Description

The CHICAGO-LATROBE 50807 is a cobalt screw machine length drill bit designed for heavy-duty drilling in ferrous metals and hard materials. Built to Series 559 standards, it measures 0.1562 inches (5/32 inch) in diameter with an overall length of 2-1/16 inches and a flute length of 1 inch. The 135-degree split point reduces walking and requires less feed pressure at start. M42 cobalt steel construction provides heat resistance during high-speed or prolonged drilling cycles. This bit is suited for machinists, maintenance technicians, and fabricators working in production or field environments where tool longevity and hole accuracy matter.

The 50807 is rated for use in cast iron and steel workpieces, making it appropriate for structural fabrication, machine shops, and general metalworking applications. The screw machine length format — shorter than jobber length — provides added rigidity and reduced deflection, which is especially useful when drilling on drill presses, CNC machines, or manual lathes where stub-length tooling is preferred. The straight-cylindrical shank fits standard three-jaw drill chucks without modification.

Key Features

• M42 cobalt steel construction for heat resistance in hard and abrasive materials
• 135-degree split point reduces thrust and improves self-centering on entry
• Web-thinned parallel web for reduced cutting resistance
• Screw machine (stub) length adds rigidity and reduces deflection versus jobber-length bits
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Diameter tolerance of +0.0000 to -0.0007 inches for close-tolerance holes
• Meets ISO standards for dimensional accuracy

Compatibility

Designed for use in cast iron and steel workpieces. Fits any standard drill chuck or collet accepting a straight-cylindrical shank. Compatible with drill presses, CNC drilling machines, lathes, and hand-held electric drills within the appropriate speed and feed range for the workpiece material.

Installation Notes

Install and remove only with the drilling machine powered off and the spindle fully stopped. Secure the shank firmly in the chuck and verify concentricity before beginning a cut. Use cutting fluid appropriate for the workpiece material to extend tool life and maintain hole quality. Follow applicable shop safety procedures and machine manufacturer guidelines for speed and feed selection when drilling ferrous metals.