Chicago-latrobe 48511 Screw Machine Drill Bit 11/64 Hss

Product Description

The CHICAGO-LATROBE 48511 is a screw machine length drill bit designed for general-purpose drilling in cast iron, non-ferrous metals, and steel. It measures 11/64 inch (0.1719 inches) in diameter with an overall length of 2-1/8 inches and a flute length of 1-1/16 inches. The bit is manufactured from high speed steel with a bright, uncoated finish and features a standard 118-degree point angle. The straight-cylindrical shank and web-thinned parallel web design allow it to seat securely in standard chucks and reduce entry resistance. This Series 157 bit is installed and used by machinists, pipefitters, HVAC technicians, and general trade professionals who need a compact, stub-length bit for close-quarters or machine-mount drilling.

The 48511 is suited for screw machine and production drilling applications where a shorter flute length provides added rigidity and reduced deflection. Its right-hand spiral flute geometry handles a range of workpiece materials including cast iron, steel, and non-ferrous metals. The compact overall length makes it practical for drill press work, CNC setups, and hand-held drilling in confined spaces. The 118-degree standard point is compatible with common drill geometries and requires no special grinding for typical general-purpose use.

Key Features

• 11/64 inch (0.1719 inches) diameter with a tight tolerance of +0.0000 to -0.0007 inches
• High speed steel construction for durability across ferrous and non-ferrous materials
• 118-degree standard point angle with web-thinned parallel web for reduced thrust and easier entry
• Screw machine (stub) length at 2-1/8 inches overall for added rigidity in tight setups
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Bright, uncoated finish — no coating to delaminate; suitable for re-sharpening
• ISO standard compliance for dimensional consistency

Compatibility

Designed as a general-purpose screw machine length drill bit for use with cast iron, non-ferrous metals, and steel workpieces. Compatible with standard straight-shank drill chucks across drill presses, lathes, and hand-held power tools that accept a 11/64 inch shank.

Installation Notes

Install into a standard straight-shank chuck and tighten securely before operation. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Verify spindle speed is appropriate for the workpiece material and bit diameter before starting the cut. Coolant-through is not supported on this bit; apply cutting fluid externally when drilling harder steels to extend tool life.