Precision Twist Drill 5997472 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997472 is a taper length, high-speed steel drill bit in the QC91P series, sized at 3/32 inch (0.0938 inch decimal). It features a 135-degree split point that reduces walking and allows self-centering entry without a center punch. The parabolic flute geometry promotes faster chip evacuation and reduced heat buildup during deeper drilling operations. With an overall length of 4.25 inches and a flute length of 2.25 inches, this bit is designed for applications that require reach beyond what a jobber-length bit provides. It is suited for use by machinists, maintenance technicians, sheet metal workers, and trade professionals working in demanding production or field environments.

This bit is rated for general-purpose heavy-duty drilling across a broad range of materials, including alloy steel, carbon steel, stainless steel, hardened steel, tempered steel, cast iron, malleable iron, aluminum, aluminum alloy, brass, bronze, copper, nickel, titanium, titanium alloy, magnesium, magnesium alloy, and graphite. The taper length body suits work where standard jobber bits lack sufficient reach, such as drilling through structural members, deep flanges, or stacked material. The straight cylindrical shank fits standard drill chucks without adapters.

Key Features

• 135-degree split point for self-centering entry and reduced thrust force
• Parabolic flute profile with web thinning for fast chip evacuation in deep holes
• Tapered web configuration adds rigidity while maintaining cutting efficiency
• Bright/uncoated HSS finish compatible with cutting oils and standard coolants
• 6xD flute-length-to-diameter ratio provides extended reach versus jobber-length bits
• Meets ANSI standards for dimensional accuracy and geometry

Compatibility

Designed as an OEM-style replacement or direct-use taper length drill bit for standard 3-jaw drill chucks accepting a 3/32 inch straight cylindrical shank, suitable for benchtop drill presses, handheld drills, and milling machine setups across general metalworking applications.

Installation Notes

Install this bit into a properly sized drill chuck and tighten securely with a chuck key before operation. Ensure the workpiece is clamped or fixtured to prevent rotation during drilling. Apply cutting fluid when drilling ferrous metals, stainless steel, or titanium to extend bit life and control heat. Inspect the cutting edges for wear or chipping before each use and replace the bit if the split point or flute geometry is compromised.