Precision Twist Drill 5997548 Jobber Drill Bit 25/64 in

Product Description

The PRECISION TWIST DRILL 5997548 is a jobber-length twist drill bit designed for general-purpose drilling in metal and hard materials. It measures 25/64 inch (0.3906 inch) in diameter with a 5.125-inch overall length and a standard 118-degree split-point angle. The bit is manufactured from high-speed steel with a steam oxide coating that reduces friction and provides light corrosion resistance during storage and use. The straight-cylindrical shank fits standard three-jaw chucks. This is a shop-floor tool installed and used by machinists, maintenance technicians, pipefitters, and general trades requiring precision hole drilling in production or field environments.

The 5997548 is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It performs in both handheld and machine-mounted applications including drill presses, CNC machines, and power hand drills. The regular spiral flute and 10xD flute-by-diameter ratio support chip evacuation in through-hole and blind-hole drilling scenarios. The web-thinned, tapered web configuration reduces cutting resistance at entry, making it effective on harder workpiece materials where standard non-thinned webs tend to walk or chatter.

Key Features

• 25/64 inch (0.3906 inch) diameter with matching straight-cylindrical shank
• 118-degree standard point angle with web-thinned, tapered web for reduced entry force
• High-speed steel construction rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Steam oxide coating reduces friction and provides light corrosion protection
• 3.75-inch flute length supports maximum drilling depth of 3.75 inches
• Regular right-hand spiral flute promotes consistent chip evacuation
• Meets ANSI standards and NAS 907 specification

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit compatible with any standard three-jaw chuck accepting a 0.3906-inch straight-cylindrical shank. Part of the R10A-R15A-R18A series.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with rotating cutting tools. Secure the shank fully in the chuck and verify runout before drilling. Always wear appropriate eye protection and secure the workpiece before engaging the spindle. Follow applicable shop safety standards and machine manufacturer guidelines for spindle speed and feed rate selection based on workpiece material.