Precision Twist Drill 5997229 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997229 is a taper length drill bit from the QC91P series, designed for heavy-duty drilling in a wide range of metallic and non-metallic materials. It measures 21/64 inches (0.3281 inches) in diameter with a 6.5-inch overall length and a 4.125-inch flute length. The 135-degree split point promotes self-centering on contact, reducing the need for a center punch and minimizing walking on hard or smooth surfaces. Machinists, tool-and-die workers, and maintenance technicians routinely select this bit for demanding production and repair applications where standard-length bits lack the reach.

This bit is suited for use in drill presses, CNC machining centers, and handheld power drills where taper-length reach is required. The parabolic flute geometry promotes fast chip evacuation, making it effective in deeper holes and in materials that produce stringy chips. Compatible material applications include alloy steel, carbon steel, stainless steel, cast iron, malleable iron, hardened steel, tempered steel, aluminum, aluminum alloy, brass, bronze, copper, titanium, titanium alloy, magnesium, magnesium alloy, nickel, and graphite. The straight cylindrical shank fits standard drill chucks without adapters.

Key Features

• 135-degree split point for self-centering entry without a center punch
• Parabolic flute geometry accelerates chip evacuation in deep holes
• Tapered web configuration adds rigidity and reduces deflection
• Web-thinned tip lowers thrust force requirements during drilling
• Bright/uncoated high speed steel finish for general-purpose use across a broad material range
• Right-hand cut with straight cylindrical shank for compatibility with standard chucks

Compatibility

Designed as a general-purpose taper length drill bit compatible with standard drill chucks accepting a 0.3281-inch straight shank. Meets ANSI standards for taper length drill bit geometry and tolerances.

Installation Notes

Installation and use should be performed by machinists or qualified trade personnel familiar with cutting tool setup and machine operation. Secure the shank fully in the chuck and verify runout before cutting. Always power down and lock out the machine before changing bits. Use appropriate cutting fluid or coolant for the material being drilled to extend tool life, noting that this bit does not support coolant-through delivery.