Precision Twist Drill 5999900 Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999900 is an extra-length high-speed steel drill bit designed for deep-hole drilling applications where standard-length bits cannot reach. Measuring 18 inches overall with a 13-inch flute length and a 0.3438-inch diameter, this bit handles demanding production and maintenance drilling tasks. The 118-degree standard point with web thinning reduces entry force and centers the cut without a pilot hole. The bright, uncoated HSS construction is suited for a wide range of workpiece materials. This bit is used by machinists, maintenance technicians, and trade professionals working with metals, plastics, and composites.

The 5999900 fits applications where extended reach is required, such as drilling through deep structural members, fabrication fixtures, or equipment frames. Its spiral flute design with a regular helix promotes consistent chip evacuation over the full 13-inch flute length. Primary workpiece materials include aluminum, magnesium, copper, nickel, titanium, and synthetic materials. Secondary applications cover stainless steel, steel, malleable iron, nickel alloys, high-strength bronze, and reinforced plastics. The straight-cylindrical shank is compatible with standard drill chucks and collet holders across benchtop and floor-mount drill presses, magnetic drills, and CNC equipment.

Key Features

• 18-inch overall length with 13-inch flute length for deep-hole reach
• 0.3438-inch diameter, 118-degree standard point angle
• Web-thinned tapered web reduces thrust and improves self-centering
• High-speed steel construction, bright uncoated finish
• 2-flute spiral design with regular helix for consistent chip evacuation
• Right-hand cutting direction, ANSI-standard general purpose grade
• Series 1813 designation, 15xD flute-to-diameter ratio

Compatibility

Designed for use with standard drill chucks and collet systems accepting a 0.3437-inch straight-cylindrical shank. Compatible with primary workpiece materials including aluminum, magnesium, copper, nickel, synthetic, and titanium, as well as secondary materials such as stainless steel, steel, malleable iron, nickel alloys, high-strength bronze, magnesium alloys, and reinforced plastics.

Installation Notes

Secure the shank fully in a properly sized drill chuck or collet before operation and verify runout is within acceptable tolerance. Power down and de-energize or lock out the drilling equipment before changing bits. Use appropriate cutting fluid or lubricant for the workpiece material to extend tool life and maintain hole quality. Operator should follow applicable shop safety standards and wear appropriate PPE including eye protection.