Precision Twist Drill 5995725 Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5995725 is a high-speed steel extra length drill bit designed for deep-hole drilling in a wide range of materials. It measures 0.25 inches in diameter with an 8-inch overall length and a 6-inch parabolic flute, giving it a 10xD flute-to-diameter ratio suited for deeper reaches than standard-length bits. The 135-degree split point is web-thinned for self-centering entry without a center punch, reducing walking on hard or smooth surfaces. Machinists, maintenance mechanics, and tool-and-die professionals install this bit in drill presses, CNC machines, and hand-held drilling equipment.

This bit is built for high-performance applications across a broad spectrum of workpiece materials. The parabolic flute geometry improves chip evacuation during deep cuts, reducing heat buildup and the need for frequent pecking cycles. The straight-cylindrical shank at 0.25 inches diameter fits standard three-jaw chucks and collet systems without modification. Common applications include through-hole drilling in structural steel, aluminum fabrication, stainless steel components, cast iron housings, brass fittings, copper sheet, and reinforced plastics. The uncoated HSS construction allows for straightforward resharpening on conventional bench grinders or drill-point grinders when the cutting edge dulls.

Key Features

• 135-degree split point with web thinning for self-centering, no center punch required
• Parabolic flute design promotes aggressive chip evacuation in deep-hole applications
• Extra length at 8 inches OAL with 6-inch flute reaches depths inaccessible to jobber-length bits
• Uncoated high-speed steel allows easy resharpening and suits a wide material range
• Straight-cylindrical shank fits standard chucks and collets without adapters
• ANSI-standard dimensions for consistent fitment across drill-press and CNC setups

Compatibility

Compatible workpiece materials listed in the product data include aluminum, aluminum alloy, brass, bronze, carbon steel, cast iron, copper, graphite, hardened steel, high-strength bronze, magnesium, magnesium alloy, malleable iron, nickel, nickel alloy, reinforced plastic materials, stainless steel, steel, cermet, and tempered materials. Fits any drill press, mill, or hand drill accepting a 0.25-inch straight-cylindrical shank. Part of the PRECISION TWIST DRILL Series QC0860P.

Installation Notes

This bit is installed by machinists and maintenance technicians in machine shop or field drilling operations. Secure the shank fully in the chuck and verify runout before beginning a cut. For deep-hole operations, use a compatible cutting fluid or coolant to manage heat, and employ a pecking cycle to clear chips and prevent flute packing. Inspect the cutting edges before each use and regrind or replace if the point shows visible wear.