Precision Twist Drill 5999598 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999598 is a reduced shank drill bit engineered for demanding metal-cutting applications. The bit features a 1.0781-inch cutting diameter paired with a 1/2-inch Weldon flat shank, allowing it to seat securely in standard 1/2-inch chucks and holders without slippage. The 118-degree standard point angle is ground from high-speed steel with a bright, uncoated finish. At 6 inches overall length with a 3-inch flute length and 3-inch maximum drilling depth, this Series R57 bit is suited for through-hole and blind-hole work on a wide range of workpiece materials.

This bit is designed for use in machine shop, fabrication, and maintenance environments where drill presses, CNC machining centers, or mill-drill setups are common. The right-hand spiral flute geometry clears chips efficiently during drilling operations. The Weldon flat shank with three flats resists rotation under the cutting loads generated when drilling large-diameter holes. Typical installers and operators include machinists, tool-and-die technicians, and industrial maintenance professionals working with ferrous and non-ferrous stock.

Key Features

• 1.0781-inch (1-5/64 inch) cutting diameter with a reduced 1/2-inch Weldon flat shank for use in standard holders
• Three-flat Weldon shank design prevents bit rotation under heavy cutting loads
• 118-degree standard point angle for general-purpose drilling across a broad material range
• High-speed steel construction with bright, uncoated finish
• Right-hand cut with regular spiral fluting for consistent chip evacuation
• ANSI-standard geometry; Series R57 designation

Compatibility

Designed for use in machine tool spindles and drill press chucks accepting a 1/2-inch Weldon flat shank. Suitable for drilling alloy steel, carbon steel, cast iron, aluminum, aluminum alloy, brass, bronze, copper, magnesium, magnesium alloy, hardened steel, high-strength bronze, austenitic and ferritic materials, alloyed titanium, case carburising steel, cermet, and lamellar graphite workpieces.

Installation Notes

Install and remove this bit with the machine fully powered down and the spindle at a complete stop. Secure the Weldon flat shank firmly in the holder set screws, engaging all three flats as designed to prevent slippage. Use cutting fluid or coolant appropriate to the workpiece material when the machining setup allows, as this bit does not carry an internal coolant channel. Follow applicable shop safety standards and machine manufacturer guidelines for large-diameter drilling operations.