Precision Twist Drill 5998162 Jobber Drill Bit 25/64

Product Description

The PRECISION TWIST DRILL 5998162 is a jobber-length twist drill bit designed for general-purpose drilling in a wide range of metalworking applications. Built from high-speed steel with a steam oxide coating, it measures 25/64 inches (0.3906 inches) in diameter with a 5.125-inch overall length. The 135-degree split point reduces walking on entry and lowers the thrust needed to start a hole. The web-thinned, tapered-web construction keeps the cutting edge efficient through the full flute depth. Licensed contractors, machinists, and maintenance technicians reach for this bit when working through ferrous and non-ferrous stock on the bench or in the field.

This drill bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The regular-spiral, two-flute design provides reliable chip evacuation in both light and heavy-duty production drilling. With a straight cylindrical shank measuring 25/64 inches in diameter and 1.375 inches in length, it fits standard drill chucks without adapters. The Series R10B design conforms to ANSI and NAS 907 standards, making it a drop-in fit for shops that specify to those tolerances.

Key Features

• High-speed steel construction with steam oxide finish for reduced friction and corrosion resistance
• 135-degree standard point angle minimizes bit walking and lowers drilling thrust
• Web-thinned, tapered-web design maintains cutting efficiency through the full flute length
• 3.75-inch flute length supports a maximum drilling depth of 3.75 inches
• Straight cylindrical shank fits standard drill chucks without a sleeve or adapter
• Conforms to ANSI and NAS 907 specifications for shops with controlled tooling standards

Compatibility

Compatible with steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium workpieces. Fits any standard drill chuck accepting a 25/64-inch straight cylindrical shank. Part of the R10B-R15B-R18B series.

Installation Notes

Install and remove only with the drill powered down and the chuck fully released. Secure the workpiece before drilling to prevent rotation or movement during the cut. Follow shop safety protocols and applicable ANSI machining standards when operating rotary cutting tools. Inspect the cutting edge for wear or chipping before each use and replace if the point is damaged.