Chicago-latrobe 50855 Cobalt Screw Machine Drill Bit

Product Description

The CHICAGO-LATROBE 50855 is a cobalt screw machine length drill bit designed for heavy-duty metal cutting applications in industrial and trade environments. Built to M42 cobalt material grade standards, it delivers superior heat resistance and edge retention when drilling into tough ferrous materials. The bit features a 135-degree split point for fast penetration and reduced walking on entry, paired with a web-thinned, parallel web construction that lowers thrust requirements. At 0.413 inches in diameter (Letter size Z), it fits standard straight-cylindrical shank chucks and is suited for machinists, tool and die technicians, and maintenance trades working with production drilling equipment.

This bit is engineered for use on cast iron and steel workpieces in screw machine and short-run production drilling setups. Its regular spiral, two-flute geometry promotes efficient chip evacuation in these materials. The shorter screw machine length body provides added rigidity compared to jobber-length bits, making it a practical choice for drill press, turret lathe, and CNC screw machine applications where deflection control matters.

Key Features

• M42 cobalt construction for heat resistance and extended tool life in hard metals
• 135-degree split point reduces thrust and eliminates center-punch requirements on most surfaces
• Web-thinned parallel web lowers cutting resistance and improves chip flow
• Screw machine length body provides greater rigidity than jobber-length equivalents
• Right-hand cut, regular spiral flute optimized for cast iron and steel
• ISO standard compliance with tight diameter tolerance of +0.0000 to -0.0010 inches

Compatibility

Designed for use with standard straight-cylindrical shank drill chucks; primary workpiece materials are cast iron and steel. Part of the CHICAGO-LATROBE Series 559 heavy-duty cobalt drill bit line.

Installation Notes

Secure the bit firmly in a compatible straight-shank chuck before operation and verify chuck key is removed prior to spindle engagement. Use appropriate cutting fluid or coolant for the workpiece material to maximize tool life, noting this bit does not support through-coolant delivery. Follow shop safety standards and machine manufacturer guidelines for speed and feed rates appropriate to the workpiece material and bit diameter.