Precision Twist Drill 5999624 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999624 is a reduced shank twist drill bit machined from high-speed steel (HSS) for general-purpose drilling in ferrous metals, aluminum, copper, titanium, and a range of other materials. The bit measures 11/16 inch (0.6875 inch) in diameter with a 1/2 inch Weldon flat shank, allowing it to seat securely in compatible chucks without slipping under torque. The 118-degree standard point angle is the conventional choice for most metal-drilling applications. Overall length is 6 inches with a 3-inch flute length, giving a maximum drilling depth of 3 inches. Finish is bright/uncoated. This is a right-hand cut bit from the Series R57 line.

This drill bit is suited for machine-shop, maintenance, and fabrication environments where a reduced shank is needed to fit a 1/2 inch chuck while drilling a larger 11/16 inch hole. The Weldon flat shank with three flats prevents rotation in the chuck during high-torque operations. Typical applications include drilling through structural steel, plate stock, aluminum stock, copper, magnesium, nickel alloys, and synthetic materials. It is used in drill presses, milling machines, and hand-held power drills equipped with a 1/2 inch chuck. General-purpose tool performance makes it appropriate for production runs and one-off repair work alike.

Key Features

• 11/16 inch (0.6875 inch) cutting diameter with 1/2 inch reduced Weldon flat shank — three flats prevent chuck slip
• 118-degree standard point angle for conventional metal-drilling entry
• 3-inch flute length, 6-inch overall length, 3-inch maximum drilling depth
• High-speed steel construction — suitable for ferrous metals, aluminum, copper, titanium, nickel, magnesium, and synthetics
• Bright/uncoated finish — compatible with cutting fluids as needed
• Right-hand spiral flute, regular spiral type — Series R57, ANSI standard

Compatibility

Designed for use in any drill press, milling machine, or 1/2 inch chuck power drill requiring an 11/16 inch reduced shank drill bit with a Weldon flat drive. Conforms to ANSI standards for reduced shank twist drills.

Installation Notes

Installation is performed by machinists or maintenance technicians. De-energize and lock out the machine before inserting or removing the bit. Seat the Weldon flat shank fully into the chuck and tighten all set screws against the flats before beginning any drilling operation. Use appropriate cutting fluid or coolant for the workpiece material when required; this bit ships without coolant-through capability.