Chicago-latrobe 50815 Screw Machine Drill Bit 9/32 in Cobalt

Product Description

The CHICAGO-LATROBE 50815 is a screw machine length cobalt drill bit designed for heavy-duty drilling in ferrous metals and difficult materials. At 9/32 inches (0.2812 inches) in diameter, it features a 135-degree split point that reduces walking and allows self-centering on contact. The M42 cobalt material grade provides heat resistance and edge retention under high-speed or interrupted-cut conditions. With an overall length of 2-11/16 inches and a flute length of 1-1/2 inches, this stub-length geometry increases rigidity and reduces deflection compared to jobber-length bits. Machinists, maintenance technicians, and tool-and-die professionals reach for this format when drilling cast iron and steel in production environments.

The 50815 is suited for screw machine operations, CNC drilling, manual drill press work, and handheld drilling where stub rigidity is required. Primary workpiece materials listed by the manufacturer are cast iron and steel. The straight-cylindrical shank seats directly in standard drill chucks without adapters. The web-thinned, parallel-web construction keeps thrust loads manageable at the drill press or machining center, making it a practical choice for repetitive-cycle drilling in fabrication and production shops.

Key Features

• M42 cobalt construction for heat resistance and extended tool life in ferrous metals
• 135-degree split point reduces thrust and eliminates center punching in most applications
• Screw machine (stub) length increases rigidity and reduces deflection
• Web-thinned parallel web lowers cutting resistance during entry
• Right-hand spiral flute with regular helix evacuates chips efficiently
• Diameter tolerance of +0.0000 to -0.0010 inches meets ISO standards for close-tolerance work

Compatibility

Designed as a direct-fit replacement or substitute for any 9/32 inches straight-shank screw machine drill bit in Series 559 applications targeting cast iron and steel workpieces.

Installation Notes

Install and remove drill bits only with the machine powered down and the spindle at a full stop. Seat the straight-cylindrical shank fully in the chuck and tighten with a chuck key before operation. Use appropriate cutting fluid or coolant for the workpiece material to maximize tool life; note that this bit does not support coolant-through delivery. Inspect the cutting edges and split point before each use and replace if chipping or wear is observed.