Precision Twist Drill 5997989 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997989 is a taper length drill bit designed for demanding drilling applications across a wide range of materials. Built from high speed steel with a bright/uncoated finish, it features a 135-degree split point that reduces walking and minimizes the need for a center punch. The parabolic flute geometry promotes fast chip evacuation and cooler cutting, making it well suited for deeper holes where chip buildup is a concern. At 0.1660 inches in diameter with a 6xD flute-to-diameter ratio, this is a heavy-duty general purpose bit intended for use by machinists, tool-and-die workers, and trade professionals who need consistent performance in production environments.

This bit belongs to PRECISION TWIST DRILL Series QC91P and is rated for use in alloy steel, carbon steel, stainless steel, cast iron, malleable iron, hardened steel, tempered steel, aluminum, aluminum alloy, brass, bronze, copper, titanium, titanium alloy, magnesium, magnesium alloy, nickel, and graphite. The straight shank fits standard drill chucks without adapters, and the taper length body provides additional reach compared to a jobber-length bit without sacrificing rigidity. Wire gauge size #19 makes it easy to cross-reference with standard wire gauge drill charts used in machining and fabrication shops.

Key Features

• 135-degree split point reduces drill walking and eliminates the need for center punching in most applications
• Parabolic flute design accelerates chip evacuation and reduces heat buildup in deep-hole drilling
• High speed steel construction provides durability across a broad range of workpiece materials
• Web-thinned, tapered web configuration improves cutting efficiency and reduces thrust force
• Straight shank with 0.1660-inch shank diameter fits standard three-jaw drill chucks directly
• ANSI-standard dimensions ensure dimensional consistency and interchangeability

Compatibility

Designed as a taper length replacement drill bit for use in standard drill chucks accepting a 0.1660-inch straight shank, suitable for drill presses, CNC machining centers, and handheld drilling equipment capable of accepting the bit geometry.

Installation Notes

This bit is installed by a machinist or qualified trade professional using a standard three-jaw drill chuck. Ensure the drill press or machine is fully de-energized and the chuck is tightened securely before beginning any drilling operation. Use appropriate cutting fluid or coolant for the workpiece material to extend bit life, even though the flute geometry supports dry cutting in many applications. Follow shop safety protocols and applicable ANSI machining standards when setting spindle speed and feed rate for the material being drilled.