Precision Twist Drill 5999927 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999927 is a reduced shank drill bit designed for general-purpose drilling in ferrous metals and a wide range of secondary materials. It features a 1-7/32 inch (1.2188 inch decimal) cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to chuck into standard 1/2 inch drill chucks despite the larger bit diameter. The 118-degree standard point angle provides a reliable entry geometry for common shop and field applications. Built from high speed steel with a bright, uncoated finish, this bit delivers consistent performance across production and maintenance drilling tasks.

This bit is suited for metalworking applications in both shop and field environments, including fabrication, maintenance, and mechanical assembly work. Primary workpiece material is ferrous metal. Secondary compatible materials include aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic materials. The reduced shank design makes it practical when a larger-diameter hole is needed but only a standard 1/2 inch chuck is available. It is part of the Series R56 lineup, built to ANSI standards.

Key Features

• 1-7/32 inch cutting diameter with a reduced 1/2 inch straight-cylindrical shank for standard chuck compatibility
• 118-degree standard point angle for general-purpose entry and centering
• High speed steel construction for durability across ferrous and non-ferrous materials
• 3 inch flute length supports a maximum drilling depth of 3 inches
• Right-hand cut with regular spiral flutes for efficient chip evacuation
• Bright, uncoated finish — no coating degradation concerns during regrinding

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with standard 1/2 inch drill chucks and drilling equipment. Primary workpiece material is ferrous metal; secondary compatible materials include aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic materials as specified by the manufacturer.

Installation Notes

Installation is performed by machinists, maintenance technicians, or qualified tradespeople using a drill press, magnetic drill, or hand drill with a 1/2 inch or larger chuck capacity. Secure the shank fully in the chuck and verify concentricity before drilling. Always wear appropriate eye and hand protection when operating. Do not exceed the rated flute length as a guide for maximum single-pass drilling depth.