Precision Twist Drill 5999858 Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999858 is a 3/8-inch diameter extra length drill bit designed for deep-hole drilling applications where standard length bits cannot reach. Built from high-speed steel (HSS) with a bright uncoated finish, it features a 118-degree standard point angle and a web-thinned, tapered web configuration that reduces thrust and improves chip evacuation at entry. The spiral flute design runs 11 inches in length, giving a 15-inch overall length with a straight cylindrical shank. This bit is suited for machinists, maintenance technicians, pipefitters, and HVAC service pros who need extended reach in metal fabrication, equipment maintenance, and installation work.

This extra length drill bit is intended for use in both manual and machine drilling setups where a 15-inch overall reach is required. The 2-flute right-hand spiral geometry handles aluminum, magnesium, copper, nickel, titanium, and synthetic materials as primary workpiece targets. Secondary applications include stainless steel, nickel alloy, malleable iron, hardened steel, high-strength bronze, and reinforced plastics. The Series 1511 designation identifies this as a general-purpose grade bit built to ANSI standards, making it a practical choice for job-site drilling, panel penetrations, and equipment installations common in HVAC, plumbing, and electrical trades.

Key Features

• 3/8-inch diameter with a matching 3/8-inch straight cylindrical shank diameter for standard chuck compatibility
• 15-inch overall length with an 11-inch flute length for extended reach in deep-hole drilling
• 118-degree standard point angle with web thinning for reduced entry thrust and cleaner starts
• High-speed steel construction with bright uncoated finish — suitable for a wide range of ferrous and non-ferrous materials
• 2-flute right-hand spiral configuration promotes efficient chip removal during drilling
• Meets ANSI standards; Series 1511 general-purpose grade

Compatibility

Designed as a general-purpose extra length drill bit compatible with any 3/8-inch or larger drill chuck, including portable electric drills, drill presses, and machining centers. Suitable for drilling aluminum, magnesium, copper, nickel, titanium, stainless steel, malleable iron, hardened steel, high-strength bronze, nickel alloy, and reinforced plastic materials.

Installation Notes

This bit is installed and operated by machinists, maintenance technicians, and trade professionals using standard drill equipment. Always secure the bit fully in the chuck and verify the workpiece is clamped or fixtured before starting. Wear appropriate eye protection and follow shop or job-site safety protocols. Reduce feed rate when breaking through the back side of the workpiece to prevent bit grab or material tear-out.