Precision Twist Drill 5999915 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999915 is a reduced shank twist drill bit designed for general-purpose drilling in a wide range of materials. The bit measures 1-5/32 inches (1.1562 inches decimal) in diameter with a 1/2-inch straight-cylindrical shank, allowing it to seat in standard 1/2-inch drill chucks despite the larger cutting diameter. Manufactured from high speed steel with a bright uncoated finish, it features a 118-degree standard point angle and right-hand spiral flutes for efficient chip evacuation. Overall length is 6 inches with a 3-inch flute length, giving a maximum drilling depth of 3 inches.

This bit is suited for drilling ferrous metals, aluminum, copper, magnesium, nickel, titanium, and synthetic materials in industrial, commercial, and job-site applications. The reduced shank design makes it compatible with 1/2-inch capacity drill chucks and machines that could not otherwise accommodate a 1-5/32-inch full-shank bit. It belongs to the PRECISION TWIST DRILL Series R56 line, which is oriented toward general-purpose production and maintenance drilling tasks performed by machinists, pipefitters, ironworkers, and general contractors.

Key Features

• 1-5/32 inch (1.1562 inch) cutting diameter with a 1/2-inch reduced straight-cylindrical shank
• 118-degree standard point angle for general-purpose drilling without requiring spot drilling on most surfaces
• High speed steel construction provides durability across ferrous and non-ferrous workpiece materials
• Bright uncoated finish allows easy visual inspection for wear and regrinding
• Right-hand regular spiral flutes promote steady chip clearance during through-hole and blind-hole drilling
• ANSI-standard geometry; Series R56 construction

Compatibility

Designed for use in any 1/2-inch capacity drill chuck or machine spindle. Compatible workpiece materials include ferrous metal, aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic materials as specified by the manufacturer.

Installation Notes

Install this bit into a properly rated 1/2-inch drill chuck and verify the shank is fully seated and securely tightened before operation. Disconnect or de-energize the drill press, magnetic drill, or handheld drill before bit changes. Use appropriate cutting fluid or coolant based on workpiece material and cutting speed requirements, noting that this bit carries no internal coolant channel. Always wear appropriate eye and hand protection and follow applicable ANSI and workplace safety standards when drilling.