Precision Twist Drill 5998732 Drill Bit Letter B Hss

Product Description

The PRECISION TWIST DRILL 5998732 is a jobber-length twist drill bit sized to Letter B, equivalent to 0.2380 inches in diameter. It is manufactured from high speed steel with a steam oxide coating to reduce friction and extend tool life during drilling operations. The bit features a 118-degree standard point angle, a regular spiral flute, and a web-thinned, tapered web configuration that reduces thrust when starting a hole. With an overall length of 4 inches and a 2.75-inch flute length, this bit is suited for general-purpose through-hole and blind-hole drilling performed by machinists, maintenance technicians, and fabricators.

This drill bit is intended for use in a wide range of drilling applications on ferrous and non-ferrous materials. Primary workpiece materials include steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. The straight-cylindrical shank with a diameter of 0.2380 inches accepts standard drill chucks on benchtop drill presses, hand drills, and CNC machining centers. It is built to ANSI standards and falls within the Series R10-R15-R18 product family from Precision Twist Drill.

Key Features

• Letter B size: 0.2380 inches diameter for precise hole sizing
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Steam oxide coating reduces friction and provides light corrosion resistance during storage
• Regular spiral, 2-flute design with a 12xD flute-to-diameter ratio for efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets ANSI specification standards for jobber-length drill bits

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard drill chuck accepting a 0.2380-inch straight-cylindrical shank, including benchtop drill presses, portable hand drills, and CNC machining centers.

Installation Notes

This bit is installed by a machinist or maintenance technician into a keyed or keyless drill chuck. Secure the workpiece firmly before drilling to prevent movement and ensure accurate hole placement. Inspect the cutting edges for wear or chipping before each use, and replace the bit if the point shows signs of dulling. Appropriate personal protective equipment including eye protection should be worn during all drilling operations.