Precision Twist Drill 5999657 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999657 is a taper length, high speed steel drill bit designed for general-purpose drilling across a wide range of materials. It features a 0.5000-inch diameter with a matching straight shank, a standard 118-degree point angle, and a spiral flute configuration. The web is thinned and tapered to reduce thrust and improve chip evacuation. With an overall length of 7.75 inches and a flute length of 4.75 inches, this bit provides greater reach than a jobber-length drill while maintaining rigidity. It is installed and used by machinists, pipefitters, ironworkers, and general maintenance trades.

This drill bit is suited for production and maintenance drilling in both shop and field environments. The bright uncoated finish makes it a cost-effective option for drilling alloy steel, carbon steel, stainless steel, cast iron, aluminum, brass, bronze, copper, magnesium, nickel alloys, reinforced plastics, and similar materials. The right-hand cut and regular spiral geometry are appropriate for standard drill press, hand drill, and milling machine applications where a taper length reach is required.

Key Features

• 0.5000-inch diameter with matching 0.5000-inch straight shank for secure chuck grip
• 118-degree standard point angle for general-purpose entry into a broad range of workpiece materials
• 4.75-inch flute length with a 6xD flute-to-diameter ratio for deeper hole access than standard jobber bits
• Web-thinned, tapered web configuration reduces drilling thrust and improves chip clearing
• High speed steel construction provides toughness and heat resistance for uncoated general-purpose use
• Right-hand cut spiral flute; compatible with standard chucks and drill presses
• Meets ANSI standards for dimensional accuracy and performance

Compatibility

Designed as a general-purpose taper length replacement drill bit in the PRECISION TWIST DRILL Series R51, compatible with any 1/2-inch chuck or collet system. 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.

Installation Notes

This bit is installed by machinists, maintenance technicians, and trade professionals using standard drill presses, hand drills, or milling machines equipped with a 1/2-inch chuck or collet. Secure the shank fully in the chuck before operation and verify runout before drilling into hardened or abrasive materials. Always power down and de-energize the machine before changing bits. Follow applicable shop safety standards and wear appropriate eye protection during all drilling operations.