Precision Twist Drill 5999141 Jobber Drill Bit Wire 61

Product Description

The PRECISION TWIST DRILL 5999141 is a jobber-length drill bit sized to wire gauge 61, with a decimal diameter of 0.0390 inches. Made from high speed steel with a bright uncoated finish, it features a standard 118-degree split-point angle and a regular spiral flute configuration with web thinning at the tip. The straight-cylindrical shank seats securely in standard drill chucks. With an overall length of 1.625 inches and a flute length of 0.6875 inches, this bit handles precision drilling tasks in a wide range of materials. It belongs to the R10P-R15P-R18P series and is built to ANSI standards.

This bit is suited for small-diameter drilling applications across steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. The 18xD flute-to-diameter ratio and tapered web design support chip evacuation and stable cutting in tight-tolerance work. Typical applications include pilot hole drilling, precision component work, and any task requiring a wire-gauge bit in the 0.0000-0.0500 inch size range. It is a general-purpose tool appropriate for machine shop, maintenance, and fabrication environments.

Key Features

• Wire gauge size 61 with 0.0390 inch decimal diameter for tight-tolerance applications
• 118-degree standard point angle with web thinning for reduced thrust and cleaner entry
• High speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Regular spiral flute with tapered web supports efficient chip removal
• Straight-cylindrical shank fits standard drill chucks without adapters
• Built to ANSI specification standards for dimensional consistency

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard drill chuck or drill press that accepts a straight-cylindrical shank at 0.0390 inches diameter. Rated for workpiece materials coded P, M, K, N, and S per ISO material classification.

Installation Notes

Install in a drill press, CNC machine, or hand drill with a chuck rated for the shank diameter. Secure the shank fully in the chuck before beginning operation. Use appropriate cutting fluid when drilling stainless steel, superalloys, or titanium to extend tool life and manage heat buildup. Replace the bit if tip wear or chipping is observed, as regrinding small-diameter wire-gauge bits is not practical in most field settings.