Precision Twist Drill 5999685 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999685 is a reduced shank twist drill bit designed for general-purpose drilling in metal fabrication, maintenance, and industrial trade applications. It features a 57/64 inch (0.8906 inch decimal) cutting diameter with a 1/2 inch straight-cylindrical shank, allowing it to be chucked in standard 1/2 inch drill chucks. Manufactured from high speed steel with a bright, uncoated finish, the bit is built for right-hand cutting in a wide range of ferrous and non-ferrous materials. The 118-degree standard point angle provides a reliable, self-centering entry on most common workpiece materials.

This bit is suited for use in production shops, field maintenance, and fabrication environments where a reduced shank profile is needed to run a large-diameter bit through a standard 1/2 inch capacity drill or press. The Series R56 designation places this in PRECISION TWIST DRILL's general-purpose reduced shank line. Compatible workpiece materials include ferrous metals, aluminum, copper, magnesium, nickel, titanium, and certain synthetic materials, making it a practical choice for a broad range of drilling tasks without specialty tooling.

Key Features

• 57/64 inch cutting diameter (0.8906 inch decimal) with a 1/2 inch reduced shank for standard chuck compatibility
• 118-degree standard point angle for general-purpose drilling across ferrous and non-ferrous metals
• High speed steel construction provides durability in moderate-heat cutting applications
• Bright, uncoated finish — no coating to chip or delaminate under heavy use
• Right-hand spiral flute with regular helix for efficient chip evacuation
• 3 inch flute length supports drilling to a maximum depth of 3 inches

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with standard 1/2 inch keyed and keyless drill chucks and drill press spindles. Suitable for use on ferrous metals, aluminum, copper, magnesium, nickel, titanium, and synthetic materials per Series R56 specifications. Conforms to ANSI standards.

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or tradesperson familiar with drill press and hand drill operation. Always power down and lock out the drilling machine before inserting or removing the bit, and confirm the shank is fully seated and the chuck is tightened before operation. Wear appropriate eye protection and secure the workpiece with proper fixturing — never hold a workpiece by hand when drilling with large-diameter bits. Consult applicable shop safety standards and machine manufacturer guidelines for spindle speed and feed rate recommendations appropriate to the workpiece material.