Precision Twist Drill 5999079 No 18 Hss Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5999079 is a jobber-length twist drill bit in wire gauge size No. 18, measuring 0.1695 inches in diameter. Built from high speed steel with a steam oxide coating, it features a 135-degree split point for reduced walking and faster penetration on hard surfaces. The two-flute spiral design with a tapered web and web-thinned point supports efficient chip evacuation during through-hole and blind-hole drilling operations. At 3.25 inches overall length with a 2.125-inch flute, this bit is suited to hand-held drill motors, drill presses, and CNC setups used by machinists, maintenance technicians, and fabricators working across a range of materials.

This bit is designed for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. Its general-purpose grade and regular spiral make it a practical choice for production drilling and maintenance repair operations in both shop and field environments. The straight cylindrical shank fits standard drill chucks without adapters, and the 13xD flute-to-diameter ratio supports moderate drilling depths up to 2.125 inches. It meets ANSI standards and carries the NAS 907 specification designation, making it suitable for aerospace and industrial fastener hole applications where dimensional consistency is required.

Key Features

• Wire gauge No. 18 diameter — 0.1695 inches — for precision hole sizing in tight-tolerance work
• 135-degree standard point with web thinning reduces thrust force and minimizes bit walking on entry
• Steam oxide coating provides moderate lubricity and corrosion resistance during cutting
• Two-flute regular spiral with tapered web supports reliable chip evacuation in deep holes
• Straight cylindrical shank fits standard three-jaw chucks without sleeve adapters
• Meets ANSI standards; NAS 907 specification designation for aerospace-grade dimensional compliance

Compatibility

Part of the R10B-R15B-R18B series, this bit is designed as an OEM-compatible general-purpose jobber drill for use in standard drill chucks accepting a 0.1695-inch straight shank. Suitable for workpiece material codes P, M, K, N, and S covering steel, stainless steel, cast iron, non-ferrous metals, and superalloys.

Installation Notes

Install in a drill press, hand drill, or CNC spindle with a properly sized chuck; confirm chuck jaws are fully tightened before starting the cut. Power down all equipment and secure the workpiece before bit changes. Use appropriate cutting fluid when drilling stainless steel, superalloys, or titanium to manage heat and extend tool life. Dispose of worn bits per shop safety protocols — HSS bits retain sharp edges after failure.