Chicago-latrobe 50867 Screw Machine Drill Bit 0.189 in Cobalt

Product Description

The CHICAGO-LATROBE 50867 is a cobalt screw machine length drill bit designed for heavy-duty drilling in ferrous metals and abrasion-resistant materials. Built to Series 559 standards, it features a 135-degree split point that reduces walking and cutting torque at entry. The M42 cobalt material grade provides heat resistance during prolonged cuts in cast iron and steel. At 0.189 inches (Wire Size 12) in diameter, it fits standard straight-cylindrical shank chucks on drill presses and hand drills alike. This bit is a workman tool for machinists, maintenance mechanics, and fabricators who drill ferrous stock routinely.

This bit is suited for production and maintenance drilling in cast iron and steel workpieces. The screw machine length profile, shorter than a jobber bit, provides greater rigidity and reduced deflection in CNC machining centers, turret lathes, drill presses, and hand-held pneumatic or electric drills. The 2-flute spiral configuration clears chips effectively in both through-hole and blind-hole applications. It is appropriate for both light production runs and heavy shop-floor use where tool life under heat and load matters.

Key Features

• M42 cobalt construction handles elevated cutting temperatures in steel and cast iron
• 135-degree split point reduces thrust force and self-centers on entry without a center punch
• Web-thinned, parallel web configuration improves chip evacuation and reduces torque demand
• Screw machine length body provides added rigidity and less deflection versus jobber-length bits
• Right-hand spiral flute with ISO standard tolerances (+0.0000 to -0.0007 inches on diameter)
• Heavy-duty grade rated for demanding ferrous-metal drilling applications

Compatibility

Designed for use in standard straight-cylindrical shank drill chucks; compatible with primary workpiece materials including cast iron and steel as specified by the manufacturer for Series 559 heavy-duty cobalt screw machine drill bits.

Installation Notes

This bit is installed by machinists, maintenance mechanics, and fabricators using a standard keyed or keyless drill chuck. Secure the shank fully in the chuck before operation and verify the workpiece is clamped to prevent rotation. Use appropriate cutting fluid or coolant on steel workpieces to extend tool life, even though this bit does not have a coolant-through passage. Follow shop safety protocols including eye protection and secure guarding when operating drill presses or CNC equipment.