Chicago-latrobe 48381 Screw Machine Drill Bit 0.191 in

Product Description

The CHICAGO-LATROBE 48381 is a screw machine length drill bit designed for high-production drilling in ferrous metals. Built from high speed steel with a coated finish, it measures 0.191 inches in diameter (wire size #11) and runs a 135-degree split point for fast penetration and reduced walking on hard surfaces. The shortened screw machine length body provides added rigidity in drill press and CNC turret applications, making it a common choice for machinists and maintenance technicians working in tight setups or with short-travel spindles. Web thinning reduces thrust load and improves chip evacuation on difficult materials.

This bit is suited for drilling cast iron and steel in light manufacturing, general machining, and maintenance repair operations. The 2-flute spiral configuration with a parallel web handles both through-hole and blind-hole work. With a straight cylindrical shank it seats directly into standard drill chucks without adapters. The screw machine length format is commonly used where drill press quill travel is limited or where workpiece fixturing requires a shorter tool profile.

Key Features

• 0.191 inch diameter with a tolerance of +0.0000 to -0.0007 inches for consistent hole sizing
• 135-degree split point reduces thrust and minimizes bit walking on hard surfaces
• Web-thinned parallel web lowers cutting resistance and improves chip clearing
• High speed steel construction with coated finish for extended tool life on steel and cast iron
• Screw machine length body (2.25 inches overall, 1.1875-inch flute length) adds rigidity in short-travel setups
• Right-hand cut, 2-flute spiral design compatible with standard drill chucks via straight cylindrical shank

Compatibility

Designed for drilling cast iron and steel workpieces. Meets NAS 907 specification (NAS designation) and conforms to ISO standards. Part of the CHICAGO-LATROBE Series 2159 heavy-duty screw machine drill line.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling technician familiar with drill press or CNC turret operations. Secure the workpiece firmly before drilling and ensure the shank is fully seated and locked in the chuck before spindle engagement. Use appropriate cutting fluid or coolant when drilling steel to manage heat buildup, noting this bit does not support through-coolant delivery. Follow all applicable shop safety procedures including eye protection and chip guarding.