Precision Twist Drill 5999223 Wire 79 Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5999223 is a wire gauge size 79 jobber-length drill bit ground from high speed steel with a bright, uncoated finish. It carries a 118-degree standard point angle and a right-hand spiral flute with a regular helix, making it a general-purpose drilling tool suited for production and maintenance environments. The bit measures 0.75 inches overall length with a 0.125-inch flute length and a straight-cylindrical shank diameter of 0.0145 inches. The web is thinned and tapered, reducing entry resistance in harder stock. Machinists, tool-and-die techs, and maintenance technicians reach for this bit when precision micro-drilling is required.

This bit is built for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It fits applications where a wire gauge number 79 hole diameter of 0.0145 inches is specified, including instrument work, electronics chassis, jig fixtures, and precision mechanical assemblies. The ANSI-standard geometry and R18P series designation place it in a well-established size family used across general manufacturing and maintenance shops. Coolant-through capability is not included, so external flood or mist cooling is recommended when drilling heat-sensitive materials or running extended cycles.

Key Features

• Wire gauge size 79 with 0.0145-inch decimal diameter for precision micro-hole applications
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust force
• High speed steel construction handles steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Right-hand spiral flute with regular helix promotes consistent chip evacuation in shallow holes
• Straight-cylindrical shank fits standard drill chucks and collets without special adapters
• ANSI-compliant geometry in the R10P-R15P-R18P series for predictable, repeatable performance

Compatibility

Designed as a general-purpose OEM-style jobber drill bit in wire gauge size 79, compatible with any standard drill chuck or collet sized to accept a 0.0145-inch straight-cylindrical shank. Suitable for bench drill presses, CNC machining centers, and hand-held drill drivers equipped for micro-diameter tooling.

Installation Notes

Installation and use of this bit should be performed by a qualified machinist or trained technician familiar with micro-diameter tooling. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits, as small-diameter bits are sensitive to misalignment and deflection. Power down and de-energize the spindle completely before changing tooling. Avoid side-loading or prying with the bit, as the small shank diameter is susceptible to breakage under lateral force.