Chicago-latrobe 49204 Screw Machine Drill Bit 1/16 in

Product Description

The CHICAGO-LATROBE 49204 is a screw machine length drill bit designed for high-volume, close-tolerance drilling in cast iron and steel. Built from heavy-duty high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned parallel web geometry that reduce walking and cutting force at entry. The straight-cylindrical shank and regular spiral flute promote chip evacuation in short-stroke applications. At 0.0625 inches (1/16 inch) in diameter, this bit is sized for small-bore work where precision and rigidity are critical. It is a go-to for machinists and maintenance techs who need repeatable results in production environments.

The 49204 is suited for screw machine and drill press operations on ferrous workpieces, including cast iron and steel. Its stub-length body — 1-5/8 inches overall with a 5/8-inch flute length — provides added rigidity compared to jobber-length bits, making it especially useful in turret and gang-drill setups where tool overhang must be minimized. It is appropriate for both manual and CNC short-cycle drilling applications where bit deflection and hole positional accuracy are priorities.

Key Features

• 135-degree split point reduces walking and lowers thrust force on entry
• Web-thinned, parallel web geometry improves chip clearance and cutting efficiency
• Heavy-duty high speed steel construction rated for cast iron and steel workpieces
• Screw machine (stub) length body increases rigidity and reduces deflection
• Right-hand cut, regular spiral flute with straight-cylindrical shank for standard chuck compatibility
• Diameter tolerance held to +0.0000 to -0.0005 inches for precise hole sizing

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for screw machine, drill press, and CNC turret applications drilling cast iron and steel. Straight-cylindrical shank fits standard three-jaw drill chucks and collet holders accepting 1/16-inch shanks.

Installation Notes

Installation and use of this bit should be performed by machinists or qualified trade professionals familiar with drill press, screw machine, or CNC lathe operation. Secure the straight-cylindrical shank firmly in the chuck or collet before operation and verify zero runout where tolerances are critical. Use appropriate cutting fluid or coolant for ferrous workpieces to extend tool life, noting that this bit does not support coolant-through delivery. Follow machine guarding requirements and applicable shop safety protocols throughout use.