Precision Twist Drill 5998154 Jobber Drill Bit 23/64

Product Description

The PRECISION TWIST DRILL 5998154 is a jobber-length drill bit designed for general-purpose drilling in metal and hard materials. It is machined from high speed steel with a steam oxide coating to reduce friction and provide basic corrosion resistance during operation. The bit features a 135-degree split point for reduced walking on entry, a two-flute regular spiral configuration, and a web-thinned tapered web for improved chip evacuation. At 4.875 inches overall length with a 3.5-inch flute length, it fits standard drill chucks via its straight cylindrical shank. Machinists, maintenance technicians, and metalworking trades install this bit for production and repair drilling applications.

This bit is built for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It conforms to NAS 907 and ANSI standards, placing it in the Series R10B-R15B-R18B lineup from Precision Twist Drill. Typical use cases include hole-making in structural steel, sheet metal fabrication, maintenance repair operations, and production drilling where a heavy-duty HSS bit is specified. The 23/64 inch diameter makes it a common size for bolt clearance holes and tapping prep work across industrial and field environments.

Key Features

• 23/64 inch (0.3594 inch) diameter with matching straight cylindrical shank for secure chuck engagement
• 135-degree standard point angle with web-thinned tapered web for reduced thrust and cleaner entry
• Steam oxide coating reduces friction and provides light corrosion protection during use
• Two-flute regular spiral at 10xD flute-to-diameter ratio for efficient chip removal in deep holes
• Compatible with steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium workpieces
• Meets NAS 907 and ANSI standards; heavy-duty grade construction for demanding drilling cycles

Compatibility

Designed as a general-purpose jobber-length drill bit suitable for use in standard 3-jaw drill chucks, drill presses, CNC machining centers, and handheld power drills accepting straight cylindrical shanks in the 23/64 inch size range. Rated for workpiece material codes P, M, K, N, and S per ISO classification.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill chuck rated for the shank diameter. Ensure the drill press or power tool is powered down and secured before loading or removing the bit. Secure the workpiece firmly before drilling to prevent movement and bit deflection. Use appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to extend bit life; note this bit does not support through-coolant delivery.