Precision Twist Drill 5999971 Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999971 is a high speed steel extra length drill bit designed for deep-hole drilling in a wide range of materials. It measures 0.2188 inches in diameter with a 12-inch overall length and a 9-inch flute length, making it well suited for applications where standard-length bits cannot reach. The 118-degree point angle and web-thinned, tapered web configuration reduce entry force and improve chip evacuation. Right-hand spiral flutes with a regular helix promote consistent cutting action. Licensed machinists, maintenance technicians, and fabricators are the primary installers of this tool.

This drill bit is built for general-purpose drilling in non-ferrous metals, plastics, and ferrous materials. Primary workpiece materials include aluminum, magnesium, copper, nickel, synthetic materials, and titanium. Secondary applications cover stainless steel, hardened steel, nickel alloy, malleable iron, high strength bronze, magnesium alloy, and reinforced plastics. The Series 1290 designation places it within a family of extended-length bits engineered for reach-critical setups in production and maintenance environments. The straight cylindrical shank seats in standard drill chucks without requiring special toolholding.

Key Features

• 0.2188-inch diameter with 12-inch overall length for deep-reach drilling
• 9-inch flute length provides extended chip clearance in deep bores
• 118-degree standard point angle suits a broad range of workpiece materials
• Web-thinned, tapered web reduces thrust and improves penetration
• High speed steel construction, uncoated, for general-purpose use
• Right-hand cut with regular spiral and two flutes for clean chip evacuation
• Meets ANSI standards for dimensional consistency

Compatibility

Designed as a general-purpose extra length drill bit compatible with standard drill chucks and toolholding equipment that accept a 0.2188-inch straight cylindrical shank. Suitable for use in drill presses, CNC machining centers, and handheld power tools configured for that shank diameter.

Installation Notes

Install this bit in a properly sized chuck or collet, ensuring the shank is fully seated and securely clamped before operation. Secure the workpiece firmly to prevent movement during drilling. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve hole quality. Inspect the cutting edges for wear before each use and replace the bit if the point shows chipping or excessive dullness.