Precision Twist Drill 5999986 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999986 is a reduced shank twist drill bit designed for general-purpose drilling in metal and other common materials. It features a 35/64 inch (0.5469 inch decimal) cutting diameter with a 1/2 inch straight-cylindrical reduced shank, allowing it to be used in standard 1/2 inch drill chucks. The 118-degree standard point angle provides reliable starting and consistent hole geometry. Built from high-speed steel with a bright, uncoated finish, it is suited for everyday production and maintenance drilling tasks performed by machinists, maintenance technicians, and fabricators.

This bit is intended for drilling ferrous metals as its primary application, and is also rated for use in aluminum, copper, magnesium, nickel, titanium, synthetic materials, and cermet. The reduced shank design makes a larger-diameter bit accessible to setups limited to 1/2 inch chuck capacity. With a 3 inch flute length and 6 inch overall length, it provides sufficient depth capacity for through-holes in moderate stock thickness. It is well suited for use in drill presses, milling machines, and hand-held power drills in shop and field environments.

Key Features

• 35/64 inch cutting diameter (0.5469 inch decimal) with 1/2 inch reduced straight-cylindrical shank
• 118-degree standard point angle for reliable self-starting on ferrous and non-ferrous materials
• High-speed steel construction for durability across a wide range of workpiece materials
• Bright, uncoated finish suitable for general-purpose use without specialized coolant requirements
• Right-hand cut with regular spiral flute geometry for efficient chip evacuation
• Conforms to ANSI standards; Series R56

Compatibility

Designed as an OEM-style general-purpose reduced shank drill bit compatible with 1/2 inch drill chucks; rated for ferrous metals as the primary workpiece material and also suitable for aluminum, copper, magnesium, nickel, titanium, synthetic materials, and cermet per Series R56 specifications.

Installation Notes

Installation is performed by machinists or maintenance technicians using a drill press, milling machine, or power drill equipped with a 1/2 inch or larger chuck. Secure the reduced shank fully in the chuck jaws before operation to prevent slippage. Ensure the workpiece is clamped or fixtured before drilling. No coolant is required per spec, but cutting fluid may be applied at the operator's discretion for extended tool life on hard ferrous stock.