Precision Twist Drill 5999957 Extra Length Drill Bit Hss

Product Description

The PRECISION TWIST DRILL 5999957 is a high speed steel (HSS) extra length drill bit designed for deep-hole drilling applications requiring extended reach beyond standard bit lengths. The bit measures 0.3906 inches in diameter with an 18-inch overall length and a 13-inch spiral flute, providing the clearance and chip evacuation needed when boring into thick stock or deep cavities. The 118-degree standard point and web-thinned geometry reduce entry force and improve centering on the workpiece. With a bright, uncoated finish and a straight-cylindrical shank, this bit seats securely in conventional drill chucks and spindles. It is used by machinists, pipefitters, and maintenance mechanics who need a reliable general-purpose bit for production or field work.

The 5999957 is suited for drilling into aluminum, magnesium, copper, nickel, synthetic materials, and titanium as primary workpiece materials. Secondary materials include stainless steel, hardened steel, high strength bronze, nickel alloys, malleable iron, reinforced plastics, and steel. The 15xD flute-to-diameter ratio and tapered web configuration support consistent chip flow in deeper cuts. Right-hand cutting direction is standard. This bit is appropriate for use in drill presses, milling machines, and hand-held power tools where a straight-shank extra-length bit is required.

Key Features

• 18-inch overall length and 13-inch flute length for deep-reach drilling applications
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust and improved starts
• High speed steel construction for durability across a broad range of workpiece materials
• Bright uncoated finish compatible with cutting fluids and oils
• Straight-cylindrical shank fits standard drill chucks without adapters
• Two-flute spiral design with regular spiral type for efficient chip evacuation
• ANSI standard compliance for dimensional consistency

Compatibility

Designed as a general-purpose extra length drill bit compatible with standard drill chucks and spindles accepting a 0.3906-inch straight-cylindrical shank. Primary workpiece materials include aluminum, magnesium, copper, nickel, synthetic, and titanium. Secondary workpiece materials include stainless steel, hardened steel, high strength bronze, nickel alloys, malleable iron, reinforced plastics, and steel.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or mechanics familiar with drill press and rotary tool operation. Secure the straight-cylindrical shank fully into the chuck before operation and verify runout before beginning the cut. Apply appropriate cutting fluid for the workpiece material to extend tool life and maintain dimensional accuracy. Inspect the cutting edges for wear or chipping before each use, and never force a dull bit through material.