Precision Twist Drill 5999190 Wire 79 Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5999190 is a wire gauge size 79 jobber length drill bit ground from high speed steel with a steam oxide coating. At 0.0145 inches in diameter and 0.75 inches overall length, this is a precision small-diameter bit designed for drilling tight, accurate holes in metal workpieces. The 118-degree standard point angle and two-flute spiral design promote clean entry and efficient chip evacuation. The web-thinned, tapered web construction reduces thrust requirements at the point. This bit is used by machinists, tool-and-die technicians, and precision fabricators who require consistent performance at very small diameters.

This bit is suited for drilling operations in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. Its general-purpose grade and ANSI-compliant geometry make it a go-to for production drilling, fixture work, and precision hole layouts where wire gauge sizing is specified. The straight-cylindrical shank seats directly in standard drill chucks and collets without special adapters. With a maximum drilling depth of 0.125 inches and a 9xD flute-to-diameter ratio, this bit is intended for shallow, through-hole work in hard and exotic materials at small diameters.

Key Features

• Wire gauge size 79, decimal diameter 0.0145 inches for precision small-hole work
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust
• Steam oxide coating helps reduce friction and improve lubricity in metal drilling
• High speed steel construction handles steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Two-flute regular spiral design promotes chip clearing in shallow drilling applications
• Straight-cylindrical shank fits standard drill chucks and collets; ANSI specification compliant

Compatibility

Designed as a general-purpose replacement or production bit for applications requiring wire gauge size 79 drill geometry per ANSI standards, compatible with Series R10, R15, and R18 tooling families.

Installation Notes

Installation of this bit is performed by machinists and precision fabricators using standard drill presses, CNC machining centers, or hand-held drilling equipment with appropriate collet or chuck tooling. Secure the straight-cylindrical shank firmly in the chuck before operation to prevent runout at this small diameter. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life; this bit does not support through-coolant delivery. Inspect the point for chipping or wear before each use, as small-diameter bits are susceptible to breakage under side loading or excessive feed rate.