Precision Twist Drill 5999034 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999034 is a taper length high speed steel drill bit designed for general-purpose metal drilling in professional trade and industrial applications. Part of the R51FS series, it features a 118-degree standard point angle and a fast spiral flute geometry that promotes efficient chip evacuation. The 27/64 inch (0.4219 inch decimal) diameter straight cylindrical shank fits standard drill chucks without adapters. A bright, uncoated finish makes it well suited for drilling aluminum, aluminum alloys, copper, magnesium, and magnesium alloys where coating buildup or heat transfer concerns are a factor. The taper length body provides additional reach over jobber-length bits while maintaining rigidity.

This drill bit is intended for use by machinists, maintenance technicians, pipefitters, HVAC installers, and electricians who need extended reach for drilling through thicker stock or into confined structural cavities. The R51FS series is built to ANSI standards, making it a reliable choice for shop environments, field service work, and production drilling in light metals. Typical applications include drilling clearance holes, pilot holes, and through-holes in aluminum sheet, copper pipe flange stock, and magnesium castings where a standard jobber-length bit cannot reach the work surface.

Key Features

• 27/64 inch diameter with 0.4219 inch decimal equivalent for precision sizing
• 118-degree standard point angle for general-purpose drilling in non-ferrous metals
• Fast spiral flute type with 6xD flute-to-diameter ratio promotes rapid chip removal
• 4-5/8 inch flute length and 7-1/4 inch overall length provide extended reach over jobber bits
• Web-thinned, tapered web configuration reduces thrust and cutting resistance
• Right-hand cut with straight cylindrical shank fits standard 3-jaw drill chucks
• Bright/uncoated HSS finish compatible with aluminum, copper, magnesium, and their alloys

Compatibility

Rated for drilling aluminum, aluminum alloy, copper, magnesium, and magnesium alloy workpieces. Designed as an ANSI-compliant general-purpose taper length drill bit for use in standard drill chucks accepting a 27/64 inch cylindrical shank.

Installation Notes

Install the shank fully into a drill chuck and tighten securely before operation. Power down or unplug the drill press or hand drill before changing bits. Use appropriate cutting fluid or lubricant when drilling copper or aluminum to extend bit life and improve hole finish. Follow applicable shop safety codes and wear eye protection during all drilling operations.