Chicago-latrobe 48386 Screw Machine Drill Bit 0.177in Hss

Product Description

The CHICAGO-LATROBE 48386 is a screw machine length drill bit designed for high-volume, precision drilling in metalworking applications. Built from high speed steel with a coated finish, this bit delivers consistent performance in cast iron and steel materials. The 135-degree split point reduces walking at entry and requires no center punch on most surfaces. At 0.177 inches (Wire Size 16) in diameter, it runs in the 0.1500 to 0.2000 inch range and is web-thinned for reduced thrust. Licensed machinists, tool-room technicians, and industrial maintenance mechanics are the primary installers and users of this bit.

This bit is suited for screw machine operations, CNC drilling, and manual drill press work in both job-shop and production environments. The short overall length of 2-3/16 inches provides added rigidity, reducing deflection during drilling in cast iron and steel workpieces. The Series 2159 design conforms to NAS 907 and ISO standards, making it appropriate for aerospace-adjacent and precision manufacturing applications where dimensional consistency is critical. Its heavy-duty tool performance rating supports repeated use in high-cycle production settings.

Key Features

• 135-degree split point for fast penetration and reduced walking on metal surfaces
• Web-thinned, parallel web configuration reduces cutting thrust and heat buildup
• High speed steel construction with coated finish for extended tool life in steel and cast iron
• Screw machine length body (2-3/16 inches overall) provides rigidity and minimizes deflection
• Right-hand spiral flute with regular helix evacuates chips cleanly during drilling
• Meets NAS 907 and ISO standards with tight diameter tolerance of +0.0000 to -0.0007 inches

Compatibility

Designed as a screw machine length drill bit for use in cast iron and steel workpieces. Compatible with standard straight-shank drill chucks on CNC machining centers, screw machines, and drill presses accepting straight-cylindrical shanks in the 0.177-inch diameter range.

Installation Notes

Install in a compatible straight-shank drill chuck and tighten securely before operation. Ensure the spindle speed and feed rate are appropriate for the workpiece material — cast iron and steel each require different speeds and lubrication practices. Power down and lock out the machine before changing or inspecting the bit. Do not exceed the rated application materials; this bit is optimized for cast iron and steel and is not rated for coolant-through delivery.