Chicago-latrobe 50906 Screw Machine Drill Bit 0.067 in

Product Description

The CHICAGO-LATROBE 50906 is a cobalt screw machine length drill bit engineered for heavy-duty drilling in ferrous and hard materials. Built from M42 cobalt high-speed steel, it delivers superior heat resistance compared to standard HSS tooling, making it well suited for extended production runs. The 135-degree split point reduces walking and axial thrust at entry, allowing the bit to self-center without a pilot hole in most setups. At 0.067 inches in diameter (Wire Size 51), the bit carries a tight diameter tolerance of plus 0.0000 to minus 0.0005 inches, supporting consistent hole geometry in precision applications. Machinists, tool and die workers, and maintenance mechanics are the primary users of this tooling.

The 50906 is designed for drilling cast iron and steel in screw machine, CNC lathe, drill press, and production machining environments. The stub-length body keeps tool overhang short, increasing rigidity and reducing deflection on small-diameter bores. The parallel web configuration and web-thinned geometry lower cutting resistance, which is useful when running multiple holes in high-volume operations. The straight-cylindrical shank fits standard drill chucks and collet systems without modification. This bit is sold individually but requires a minimum order quantity of 12 units.

Key Features

• M42 cobalt construction for heat resistance in hard and abrasive materials
• 135-degree split point reduces walking and lowers thrust requirements at entry
• Web-thinned, parallel web geometry reduces cutting resistance during penetration
• Tight diameter tolerance of plus 0.0000 to minus 0.0005 inches for consistent hole sizing
• Screw machine (stub) length increases rigidity and limits deflection on small-diameter work
• Right-hand spiral flute configuration with 2 flutes for standard chip evacuation

Compatibility

Designed for use in standard drill chucks and collet holders accepting straight-cylindrical shanks. Primary workpiece materials listed by the manufacturer are cast iron and steel. Conforms to ISO standards for drill bit geometry.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance professionals familiar with rotating tooling and machine operation. Secure the shank fully in the chuck or collet and verify concentricity before running. Power down and lock out the machine before changing tooling. Do not exceed the spindle speed and feed rate recommendations appropriate for the workpiece material and tool diameter.