Precision Twist Drill 5999770 31/64 in Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5999770 is a taper length, straight-shank drill bit designed for general-purpose metal drilling across a wide range of workpiece materials. Ground from high speed steel (HSS) 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 clearance on entry. The 31/64-inch (0.4844 inches) diameter bit runs a right-hand spiral flute and is sized to the Series R51 standard. Licensed HVAC technicians, plumbers, electricians, and general contractors routinely stock taper length bits for applications where a jobber-length bit cannot reach the drilling depth required.

This bit is suited for production and maintenance drilling in alloy steel, carbon steel, stainless steel, cast iron, malleable iron, aluminum, aluminum alloy, brass, bronze, high-strength bronze, copper, magnesium, magnesium alloy, nickel, nickel alloy, reinforced plastic materials, cermet, and graphite. The extended flute length relative to diameter (6xD ratio) accommodates deeper holes without a stub or extended-reach specialty bit. Typical applications include drilling clearance holes, pilot holes, and through-holes in structural and mechanical assemblies where standard jobber-length bits fall short.

Key Features

• 31/64-inch (0.4844 inches) diameter, Series R51 taper length configuration
• High speed steel construction rated for general-purpose drilling across ferrous and non-ferrous materials
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Right-hand, regular spiral flute with 4.75-inch flute length for efficient chip evacuation
• Bright/uncoated finish — compatible with cutting fluid use across all listed materials
• Straight shank, non-threaded, fits standard drill chucks without adapters

Compatibility

Designed as a general-purpose OEM-style replacement or stock drill bit for use in standard drill chucks accepting a straight shank in the 31/64-inch diameter range, conforming to ANSI standards.

Installation Notes

Installation is performed by machinists, maintenance technicians, electricians, and trade professionals using standard keyed or keyless drill chucks rated for the shank diameter. Secure the shank fully in the chuck before operation and verify chuck runout is within tolerance to avoid premature bit wear. Apply appropriate cutting fluid for the workpiece material, particularly when drilling stainless steel, nickel alloys, or hardened steel. Inspect the cutting edges and web before each use and replace if chipping or dulling is observed.