Precision Twist Drill 5995781 Extra Length Drill Bit

Product Description

The PRECISION TWIST DRILL 5995781 is a high-performance extra length drill bit designed for professionals who need extended reach in deep-hole drilling applications. Built from high-speed steel with a bright uncoated finish, it features a 3/16 inch diameter and an 8 inch overall length, giving it a flute-to-diameter ratio of 10xD for deep-hole work. The 135-degree split point is web-thinned and self-centering, reducing walking on entry and lowering the thrust force needed to start a hole. The parabolic flute geometry improves chip evacuation, keeping the cutting edge clear during extended cuts. Licensed tradespeople in metalworking, fabrication, and mechanical service will find this bit suited to production and repair drilling tasks.

This drill bit is suited for a wide range of materials including alloy steel, carbon steel, stainless steel, cast iron, malleable iron, aluminum alloy, brass, bronze, high strength bronze, copper, magnesium, magnesium alloy, nickel, nickel alloy, hardened steel, cermet, graphite, and reinforced plastic materials. Its extra length makes it a practical choice when standard-length bits cannot reach the target depth, such as drilling through thick stock, structural members, or deep flanged components. It is equally applicable in shop environments and on-site service work.

Key Features

• 135-degree split point with web thinning for self-centering starts and reduced thrust
• Parabolic flute geometry promotes efficient chip evacuation in deep holes
• High-speed steel construction for durability across a broad range of workpiece materials
• 8 inch overall length with 6 inch flute length for extended reach applications
• Straight-cylindrical shank compatible with standard drill chucks
• Right-hand cutting direction; ANSI standards compliant

Compatibility

Designed as an OEM-style replacement and production drill bit in the PRECISION TWIST DRILL QC0860P series, compatible with standard 3/16 inch straight-shank drill chucks used in handheld drills, drill presses, and milling machines.

Installation Notes

This bit is installed and used by machinists, fabricators, pipefitters, and mechanical contractors. Secure the straight-cylindrical shank firmly in the chuck before use and verify the chuck key is removed prior to starting the machine. Use appropriate cutting fluid or lubricant for ferrous materials to extend bit life and improve hole quality. Inspect the cutting edge for wear before each use; a dull or chipped split point will increase heat and reduce hole accuracy.