Precision Twist Drill 5999093 Drill Bit Letter D Hss

Product Description

The PRECISION TWIST DRILL 5999093 is a jobber-length drill bit sized to letter D (0.2460 inches decimal equivalent), manufactured from high speed steel with a steam oxide coating. It features a 118-degree standard point angle, a right-hand spiral flute configuration, and a straight-cylindrical shank. The overall length is 4 inches with a flute length of 2.75 inches, providing a maximum drilling depth of 2.75 inches. This is a general-purpose bit suited for production drilling and maintenance work across a wide range of materials. It is installed and used by machinists, pipefitters, HVAC technicians, and general trade professionals who require consistent hole sizing in metal fabrication and field service applications.

This drill bit is designed for use in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It is appropriate for both hand-held drill applications and drill press or CNC operations where a straight-cylindrical shank is compatible. The Series R10-R15-R18 designation covers general-purpose jobber-length geometry conforming to ANSI standards. The steam oxide finish reduces friction and helps extend tool life in ferrous and hard material applications. It ships as a single unit and is sold individually.

Key Features

• Letter D sizing at 0.2460 inches decimal equivalent for precise hole tolerances
• High speed steel construction with steam oxide coating for reduced friction in ferrous materials
• 118-degree standard point angle with web-thinned, tapered web geometry for easier starting
• Right-hand, regular spiral flute with 2-flute configuration for efficient chip evacuation
• 4-inch overall length with 2.75-inch flute length supporting deep drilling up to 2.75 inches
• ANSI-conforming Series R10-R15-R18 jobber-length geometry for broad machine compatibility

Compatibility

Designed as an OEM-style general-purpose jobber-length drill bit compatible with any drill press, hand drill, or CNC spindle accepting a straight-cylindrical shank of 0.2460 inches diameter. Rated for use in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium workpieces per ANSI specification.

Installation Notes

Install this bit in a properly sized chuck or collet, ensuring the straight-cylindrical shank is fully seated and secured before operation. Apply appropriate cutting fluid or coolant when drilling stainless steel, superalloys, or titanium to manage heat buildup, as this bit does not support coolant-through delivery. Inspect the cutting edges for wear before each use and replace the bit if chipping or dulling is observed to maintain hole accuracy. Follow shop safety standards and applicable ANSI machining guidelines when operating drill equipment.