Precision Twist Drill 5999950 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999950 is a reduced shank twist drill bit designed for general-purpose drilling in metal fabrication, maintenance, and industrial applications. The bit measures 15/16 inches (0.9375 inches) in diameter with a 1/2 inch straight-cylindrical shank, allowing use in standard 1/2 inch chuck equipment even when drilling larger holes. The 118-degree standard point angle delivers reliable entry on ferrous and non-ferrous metals alike. Constructed from high speed steel with a bright uncoated finish, this Series R56 bit offers consistent cutting performance. Licensed tradespeople and experienced machinists are the typical end users for bits in this size range.

This drill bit is suited for drilling ferrous metals including steel and iron, as well as aluminum, copper, magnesium, nickel, titanium, and synthetic materials. The reduced shank design makes it compatible with drill presses, milling machines, and hand-held power drills equipped with 1/2 inch chucks, extending the practical range of standard tooling without requiring a larger chuck. It is appropriate for both shop and field use where a larger-diameter hole is needed with standard 1/2 inch chuck capacity.

Key Features

• 15/16 inch cutting diameter with 1/2 inch reduced shank for use in standard 1/2 inch chucks
• 118-degree standard point angle for reliable starting and consistent hole geometry
• High speed steel construction for durability across ferrous and non-ferrous workpieces
• 3 inch flute length with regular spiral flute for efficient chip evacuation
• Right-hand cut, Series R56 design built to ANSI standards
• Bright uncoated finish — no coating to chip or flake during regrinding

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with any drill press, milling machine, or power drill fitted with a 1/2 inch capacity chuck. Suitable for ferrous metals, aluminum, copper, magnesium, nickel, titanium, and synthetic materials per Series R56 application guidelines.

Installation Notes

Secure the shank firmly in a properly sized 1/2 inch chuck before operation and verify the bit runs true before drilling. Always wear appropriate eye protection and secure the workpiece to prevent rotation. High speed steel bits generate heat during drilling — reduce feed pressure and use appropriate cutting fluid when drilling hard ferrous metals to extend tool life. Inspect the bit for wear or damage before each use and regrind or replace as needed.