Precision Twist Drill 5998788 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5998788 is a taper length drill bit in the R51FS series, designed for precision drilling in non-ferrous and soft metals. Built from high-speed steel with a bright, uncoated finish, this bit features a 118-degree standard point angle and a web-thinned, tapered web configuration that reduces thrust and improves chip evacuation. The spiral flute with a 6xD flute-to-diameter ratio provides efficient material removal. At 3/32 inch (0.0938 inch decimal) in diameter, with a 2.25-inch flute length and a 4.25-inch overall length, it fits standard cylindrical shank chucks and handles close-tolerance work where a jobber-length bit falls short.

This bit is suited for drilling aluminum, aluminum alloy, copper, magnesium, and magnesium alloy in both shop and field applications. The taper length body provides additional reach compared to standard jobber bits, making it useful for deeper hole applications in fabrication, HVAC sheet metal work, electrical enclosure drilling, and general mechanical trade work. Right-hand cut spiral flutes are compatible with standard drill presses, hand drills, and CNC drill setups. The bit meets ANSI standards and is rated as a general-purpose grade tool.

Key Features

• High-speed steel construction for durability in non-ferrous metal drilling
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Fast spiral, right-hand cut flute for efficient chip clearing
• Taper length body at 4.25 inches OAL provides extended reach over standard jobber bits
• Bright, uncoated finish for use across general-purpose drilling applications
• Meets ANSI standards; cylindrical shank fits standard chucks without adapters

Compatibility

Rated for use in aluminum, aluminum alloy, copper, magnesium, and magnesium alloy. Designed for use with standard cylindrical shank drill chucks in hand drills, drill presses, and CNC equipment. Part of the R51FS series by PRECISION TWIST DRILL.

Installation Notes

This drill bit is installed and operated by machinists, fabricators, electricians, HVAC technicians, and plumbers using standard drilling equipment. Secure the workpiece before drilling and select appropriate drill speed for the material being cut. Inspect the cutting edges before use and replace any bit showing chipping or wear to avoid workpiece damage. No special tooling or adapters are required for cylindrical shank chucks.