Precision Twist Drill 5999562 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999562 is a reduced shank twist drill bit designed for general-purpose drilling in ferrous metals and a wide range of secondary materials. Built from high-speed steel (HSS) with a bright, uncoated finish, it measures 1.2031 inches in diameter with a 1/2-inch Weldon flat shank that locks securely in compatible chucks and holders. The 118-degree standard point angle suits most production and maintenance drilling applications. At 6 inches overall length with a 3-inch flute length, this bit is suited for setups where a reduced shank allows a larger-diameter bit to run in a standard 1/2-inch chuck. Licensed tradespeople and machinists working in metal fabrication, HVAC equipment manufacturing, and mechanical contracting will find this a practical, workhorse tool.

The 5999562 is rated for right-hand cutting with a regular spiral flute configuration. Primary workpiece material is ferrous metal. Secondary compatible materials include aluminum, copper, magnesium, nickel, titanium, cermet, and synthetics. The Weldon flat shank with three flats resists rotation under torque, making it well-suited for drill presses, milling machines, and magnetic-base drills where slip is a concern. Maximum drilling depth reaches 3 inches, consistent with the flute-to-diameter ratio of 4xD. This bit conforms to ANSI standards and carries UNSPSC code 23241635.

Key Features

• 1.2031-inch (1-13/64) drill diameter with reduced 1/2-inch Weldon flat shank for use in standard chucks
• High-speed steel construction with bright, uncoated finish for general-purpose ferrous and non-ferrous drilling
• 118-degree standard point angle for broad material compatibility without special grinding
• Three-flat Weldon shank design resists rotational slippage under high-torque conditions
• 3-inch flute length with regular spiral for efficient chip evacuation up to 3 inches depth
• ANSI-compliant Series R57 for consistent dimensional tolerances

Compatibility

Designed for use with 1/2-inch Weldon flat chuck holders and compatible drill presses, milling machines, or magnetic-base drills. Suitable as an OEM-style replacement or shop addition in any setup requiring a reduced shank bit at the 1-13/64-inch diameter in the R57 series.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with rotating cutting tools. Ensure the machine spindle is fully stopped and power is locked out before inserting or removing the bit. Confirm the Weldon flat is properly seated against the set screw in the holder to prevent slippage. Refer to machine manufacturer guidelines and applicable ANSI safety standards for appropriate speeds, feeds, and coolant practices for your specific workpiece material.