Chicago-latrobe 50804 Screw Machine Drill Bit 7/64 Cobalt

Product Description

The CHICAGO-LATROBE 50804 is a screw machine length drill bit designed for high-production drilling in ferrous and hard materials. Built from M42 cobalt steel, it holds its edge under heat and friction better than standard HSS bits. The 135-degree split point starts without walking and requires less thrust to penetrate. At 1-13/16 inches overall length with a 13/16-inch flute, it fits close-quarters drilling applications where a jobber-length bit will not clear. Machinists, tool-and-die techs, and production drillers working cast iron and steel reach for this grade when material hardness or heat buildup would wear out a standard bit faster than acceptable.

Series 559 screw machine bits are a standard choice in CNC and manual lathe operations, screw machine setups, and short-reach drill press work. The reduced flute length provides rigidity that limits deflection when drilling through cast iron or structural steel. The straight-cylindrical shank fits standard drill chucks and collet holders without modification. This bit is sold individually and is appropriate for industrial shop environments, job-site metalworking, and maintenance operations where heavy-duty tooling is required.

Key Features

• M42 cobalt construction handles elevated cutting temperatures in hard ferrous materials
• 135-degree split point self-centers on entry and reduces axial thrust
• Web-thinned parallel web lowers cutting resistance and improves chip clearance
• Screw machine length body provides extra rigidity and reduces bit deflection
• Right-hand spiral flute evacuates chips efficiently during through-hole drilling
• Diameter tolerance held to +0.0000 to -0.0005 inches for precise hole sizing

Compatibility

Designed for drilling cast iron and steel. Fits standard drill chucks and collet holders accepting a straight-cylindrical shank. Conforms to ISO standards for screw machine length drill bits.

Installation Notes

This bit is installed and removed by a qualified machinist or metalworker using a standard drill chuck key or collet wrench. Always secure the workpiece before drilling and ensure the spindle is fully stopped before changing tooling. Use appropriate cutting fluid for cast iron and steel to extend tool life. Inspect the cutting edges before each use and replace if chipping or heat discoloration is present.