Precision Twist Drill 5998386 Jobber Drill Bit 3/64 in Hss

Product Description

The PRECISION TWIST DRILL 5998386 is a jobber-length drill bit designed for general-purpose drilling in steel, cast iron, non-ferrous metals, and superalloys including titanium. It measures 3/64 inch (0.0469 inch decimal) in diameter with an overall length of 1.75 inches and a flute length of 0.75 inches. The bit is manufactured from high speed steel with a bright, uncoated finish and features a standard 118-degree point angle. It belongs to the R10H-R18H series and is built to ANSI specifications. Licensed tradespeople and shop technicians working on drilling operations in light metalworking, HVAC fabrication, and related trades will find this a reliable production-grade tool.

This bit is suited for drilling small-diameter holes in a wide range of workpiece materials including steel, cast iron, non-ferrous metals, and superalloys. The right-hand spiral flute design provides efficient chip evacuation during through-hole and blind-hole drilling. The straight cylindrical shank seats directly in standard drill chucks without adapters. Typical applications include sheet metal work, light structural fabrication, and precision hole placement where a 3/64-inch diameter is required. The tapered web and web-thinned construction reduce thrust requirements at entry.

Key Features

• 3/64 inch (0.0469 inch) diameter with matching straight-cylindrical shank diameter for true concentricity
• 118-degree standard point angle for general-purpose entry into steel and non-ferrous materials
• High speed steel construction for durability across repeated use without coating buildup concerns
• Regular spiral, 2-flute design with 16xD flute-to-diameter ratio promotes chip clearance in deeper passes
• Web-thinned, tapered web reduces cutting resistance and prolongs point life
• ANSI-compliant jobber-length geometry fits standard chuck sizes without modification

Compatibility

Designed as a general-purpose jobber-length drill bit in the PRECISION TWIST DRILL R10H-R18H series, compatible with any standard drill chuck accepting a straight-cylindrical shank of 0.0469 inch diameter. Rated for use in steel, cast iron, non-ferrous metals, and superalloys and titanium (workpiece material codes P, K, N, and S).

Installation Notes

Install in a standard keyed or keyless drill chuck and tighten securely before operation to prevent shank slippage on small-diameter bits. Use appropriate cutting fluid or lubricant when drilling steel or superalloys to extend bit life and reduce heat buildup. Run at recommended surface footage for the workpiece material — excessive speed on hard alloys accelerates point wear on uncoated HSS bits. Inspect the point for chipping or wear before each use; regrind or replace if the 118-degree geometry is compromised.