Precision Twist Drill 5998747 Taper Length Drill Bit 7/64 in

Product Description

The PRECISION TWIST DRILL 5998747 is a taper length drill bit in the R51FS series, designed for accurate hole-making in a range of non-ferrous and soft metals. Built from high-speed steel with a bright, uncoated finish, it features a 118-degree standard point angle and a spiral flute with a fast helix. The 7/64 inch diameter bit measures 2.5 inches in flute length with a 4.625 inch overall length. The cylindrical shank and right-hand cut make it a straightforward fit in standard drill chucks. It is manufactured to ANSI standards and suited for general-purpose drilling tasks in production and maintenance environments.

This bit is well matched for drilling aluminum, aluminum alloy, copper, magnesium, and magnesium alloy. Its tapered web configuration and web-thinned geometry reduce thrust when drilling these softer materials, which helps maintain hole quality and extends tool life. Typical install scenarios include sheet metal fabrication, HVAC equipment assembly, plumbing rough-in, and general maintenance work where precise pilot or clearance holes are needed in non-ferrous substrates.

Key Features

• 7/64 inch (0.1094 inch decimal) diameter with cylindrical shank of matching diameter
• 118-degree standard point for accurate self-starting on flat and curved surfaces
• High-speed steel construction with bright, uncoated finish suitable for non-ferrous materials
• Fast spiral flute with 6xD flute-to-diameter ratio for efficient chip evacuation
• Web-thinned, tapered web geometry reduces drilling thrust and improves penetration
• Right-hand cut, ANSI-compliant, no coolant-through requirement

Compatibility

Designed for general-purpose drilling in aluminum, aluminum alloy, copper, magnesium, and magnesium alloy. The cylindrical shank fits standard three-jaw drill chucks on both hand drills and drill presses.

Installation Notes

This bit is installed by a machinist, maintenance technician, or trade professional using a standard drill chuck. Secure the shank fully in the chuck before operation and verify the workpiece is clamped or fixtured to prevent movement. Use appropriate cutting fluid or lubricant when drilling copper to extend tool life. Inspect the cutting edges before each use and replace if chipping or dulling is observed.