Precision Twist Drill 5999004 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999004 is a taper length drill bit designed for general-purpose drilling across a wide range of materials. Built from high speed steel with a bright, uncoated finish, it measures 1.1875 inches in diameter and 12 inches in overall length. The spiral flute geometry and web-thinned, tapered web configuration help clear chips efficiently while reducing thrust during entry. The 118-degree standard point angle suits a broad spectrum of workpiece materials, making this bit a reliable choice for machinists, fabricators, and industrial maintenance technicians who need a longer reach than a jobber-length bit provides without moving to a full extended-length tool.

This drill bit is suited for use in machine shops, fabrication facilities, and maintenance environments where taper length reach is required. It is appropriate for use in drill presses, lathes, and CNC drilling operations. The straight shank fits standard drill chucks without adapters. Its general-purpose grade and ANSI-compliant construction make it compatible with production and repair drilling operations across metals and select non-metallic materials. The 6xD flute-length-to-diameter ratio supports deeper hole applications compared to standard jobber-length bits while maintaining adequate flute volume for chip evacuation.

Key Features

• 1.1875-inch diameter with 12-inch overall length for extended reach drilling
• High speed steel construction for durability across a wide material range
• 118-degree standard point angle for general-purpose entry and centering
• Web-thinned, tapered web design reduces cutting thrust and improves chip flow
• Right-hand spiral flute cut with 7.375-inch flute length
• ANSI-compliant Series R51 construction

Compatibility

Suitable for drilling alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, cermet, copper, graphite, hardened steel, high strength bronze, magnesium, magnesium alloy, malleable iron, nickel, nickel alloy, reinforced plastic materials, and stainless steel. Fits any standard drill chuck accepting a 1.1875-inch straight shank.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or tool operators familiar with proper speeds and feeds for the target material. Secure the straight shank firmly in a drill chuck before operation and verify chuck runout is within acceptable limits for the hole tolerance required. Always wear appropriate eye protection and follow applicable shop safety procedures when operating rotary cutting tools. Do not exceed the recommended feed rate for the workpiece material, as excessive force can cause bit deflection or breakage at this diameter.