Precision Twist Drill 5998987 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5998987 is a taper length drill bit designed for general-purpose drilling in a wide range of metalworking and fabrication applications. Built from high speed steel with a bright/uncoated finish, it measures 1.125 inches in diameter with a 118-degree standard point angle and a right-hand spiral flute. The straight shank and web-thinned, tapered web configuration support clean entry and reduced thrust in demanding materials. With an overall length of 11.75 inches and a flute length of 7.125 inches, this bit delivers the reach needed for deeper-than-standard hole applications. It is installed by machinists, tool and die trades, and general metalworking shops.

This Series R51 bit is suited for use in vertical mills, drill presses, and CNC setups where taper length reach is required. The 6xD flute-length-to-diameter ratio supports chip evacuation in deeper bores. Compatible material applications include alloy steel, aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, high strength bronze, magnesium, magnesium alloy, malleable iron, nickel, nickel alloy, reinforced plastic materials, and stainless steel.

Key Features

• 1.125-inch diameter with 118-degree standard point angle for general-purpose entry
• High speed steel construction with bright/uncoated finish
• Right-hand cut with regular spiral flute and 6xD flute-to-diameter ratio for effective chip removal
• Web-thinned, tapered web configuration reduces drilling thrust
• Straight shank at 1.125 inches diameter for standard chuck compatibility
• Overall length of 11.75 inches with 7.125-inch flute length for extended reach applications

Compatibility

Designed as an OEM-style Series R51 taper length drill bit meeting ANSI standards, suitable for use with standard straight-shank drill chucks and collets accepting a 1.125-inch shank diameter.

Installation Notes

Installation is performed by machinists or qualified metalworking tradespeople. Secure the straight shank firmly in a properly rated drill chuck or collet before operation. Verify spindle speed and feed rate are appropriate for the workpiece material before engaging the cut. Inspect the cutting edges and web for wear or chipping before each use and replace if geometry is compromised.