Precision Twist Drill 5997232 Taper Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5997232 is a taper length drill bit designed for heavy-duty metal drilling applications across a wide range of materials. Built from high speed steel (HSS) with a bright/uncoated finish, this bit measures 25/64 inch (0.3906 inches) in diameter with a 7-inch overall length and a 4-3/8-inch parabolic flute. The 135-degree split point promotes self-centering entry without a center punch, reducing walking and improving hole accuracy. A tapered web configuration and web-thinned geometry reduce cutting resistance and help clear chips efficiently during through-hole operations.

This drill bit is suited for production and maintenance machining environments where general-purpose metal drilling is required. The parabolic flute profile — rated at a 6xD flute-to-diameter ratio — supports efficient chip evacuation in deeper drilling passes. Applicable materials include alloy steel, carbon steel, stainless steel, hardened steel, tempered steel, cast iron, malleable iron, aluminum, aluminum alloy, brass, bronze, copper, graphite, magnesium, magnesium alloy, nickel, titanium, and titanium alloy. It is used in manual drill presses, CNC drill cycles, and handheld drilling operations where a straight shank bit is appropriate.

Key Features

• 25/64 inch (0.3906 inches) diameter, straight shank — no chuck adapter required
• 135-degree split point for self-centering, walk-free starts on metal surfaces
• Parabolic flute geometry at 6xD ratio for deep-hole chip clearance
• High speed steel construction rated for heavy-duty grade performance
• Web-thinned, tapered web configuration reduces thrust and cutting load
• Bright/uncoated finish — compatible with cutting fluid application
• Right-hand cut; no coolant-through capability

Compatibility

Designed as an OEM-style replacement or direct-use taper length drill bit for straight-shank drill chucks accepting 25/64 inch shanks. Conforms to ANSI standards. Part of the PRECISION TWIST DRILL QC91P series for general-purpose heavy-duty drilling.

Installation Notes

Installation and use should be performed by a qualified machinist or trained technician. Secure the straight shank firmly in a keyed or keyless drill chuck rated for the intended RPM and feed rate. De-energize and lock out the machine before changing or inspecting the bit. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish; this bit does not support coolant-through delivery.