Precision Twist Drill 5999178 Wire 72 Drill Bit Hss

Product Description

The PRECISION TWIST DRILL 5999178 is a wire gauge size 72 jobber length drill bit designed for general-purpose drilling in metal and hard materials. The bit is machined from high speed steel and finished with a steam oxide coating that reduces friction and helps resist heat buildup during operation. It cuts in a right-hand direction with a standard 118-degree point angle, a regular spiral flute, and a web-thinned tip that reduces thrust at entry. Overall length is 1.125 inches with a straight-cylindrical shank diameter of 0.0250 inches. Licensed tradespeople and precision machinists reach for this size when drilling tight-tolerance holes in steel, cast iron, and non-ferrous alloys.

This bit fits applications where a 0.0250-inch diameter hole is required, including pilot holes, jig work, and fine metalwork in both shop and field environments. Its compact jobber length and 5/16-inch flute length make it practical for benchtop drill presses, CNC equipment, and hand-held drill drivers when clearance is limited. Compatible workpiece materials include steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium, covering ISO material codes P, M, K, N, and S. The R18 series designation indicates this bit meets ANSI standards for dimensional consistency across production runs.

Key Features

• Wire gauge size 72, decimal equivalent 0.0250 inches
• 118-degree standard point angle with web-thinned tip for reduced entry thrust
• High speed steel construction with steam oxide coating for heat and friction resistance
• Regular spiral, 2-flute design with a 5/16-inch maximum drilling depth
• Straight-cylindrical shank for universal chuck compatibility
• Meets ANSI standards; Series R10-R15-R18 designation

Compatibility

Designed as a general-purpose jobber length replacement or production drill bit for use in any standard drill chuck or collet accepting a 0.0250-inch straight-cylindrical shank. Rated for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium.

Installation Notes

Installation is performed by machinists, tool and die technicians, and experienced metalworkers using a drill press, milling machine, or hand drill with a chuck rated for the shank diameter. Secure the shank fully in the chuck before operation and confirm the cutting speed is appropriate for the workpiece material and bit diameter. At this small diameter, use light feed pressure to prevent bit deflection or breakage. Always wear appropriate eye protection and follow applicable shop safety procedures.