Precision Twist Drill 5998026 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5998026 is a taper length drill bit engineered for heavy-duty material removal across a wide range of metals and alloys. Built from high speed steel with a bright/uncoated finish, it carries a No. 27 wire size designation, equal to 0.1440 inches in decimal. The 135-degree split point self-centers on contact, reducing the need for a center punch and preventing walking on hard or smooth surfaces. A parabolic flute geometry accelerates chip evacuation, keeping the cutting zone clear during deep-hole drilling. This bit is suited for machinists, maintenance technicians, and fabricators working on bench drills, drill presses, or CNC setups requiring taper length reach.

This drill bit is designed for general-purpose drilling in production and maintenance environments. The taper length body provides added reach beyond a jobber-length bit, making it useful for drilling in restricted clearance areas or through thicker workpieces. The straight shank fits standard three-jaw drill chucks. The parabolic flute with a 6xD flute-to-diameter ratio handles aggressive feed rates while maintaining chip flow. Applicable materials include alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, magnesium, magnesium alloy, malleable iron, nickel, stainless steel, steel, tempered steel, titanium, and titanium alloy.

Key Features

• No. 27 wire size with 0.1440-inch decimal diameter for precise hole sizing
• 135-degree split point for self-centering entry and reduced thrust
• Parabolic flute with tapered web construction promotes fast, reliable chip evacuation
• High speed steel construction handles a broad range of ferrous and non-ferrous materials
• Taper length body at 5.375 inches OAL provides extended reach over standard jobber bits
• Straight shank with 0.1440-inch diameter fits standard drill chucks without adapters
• Meets ANSI standards; heavy-duty grade for demanding production use

Compatibility

Designed as an OEM-style replacement or direct-use taper length drill bit compatible with any standard three-jaw drill chuck accepting a 0.1440-inch straight shank, for use on drill presses, hand drills, or CNC machinery requiring No. 27 wire size tooling.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or experienced tradespeople familiar with rotating tooling safety. Secure the straight shank fully in the drill chuck and verify chuck key is removed before powering the machine. Apply cutting fluid or lubricant when drilling ferrous metals and hardened steel to extend tool life and maintain hole quality. Never exceed the spindle speed rating for the workpiece material and bit diameter per standard machining reference tables.