Precision Twist Drill 5999647 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999647 is a reduced shank twist drill bit designed for general-purpose drilling in metal and other industrial materials. It features a 21/32 inch (0.6562 inch) cutting diameter paired with a 1/2 inch Weldon flat shank, allowing use in standard 1/2 inch chucks and holders without requiring a full-size chuck capacity. The drill is manufactured from high-speed steel with a bright, uncoated finish and ground to a 118-degree standard point angle. Overall length is 6 inches with a 3 inch flute length. Right-hand spiral flutes clear chips efficiently during through-hole and blind-hole drilling operations. This bit is suited for machinists, maintenance technicians, and fabricators working with ferrous and non-ferrous materials.

The 5999647 belongs to PRECISION TWIST DRILL Series R57, a line of general-purpose reduced shank bits built to ANSI standards. The reduced shank design is a practical solution when the required hole diameter exceeds the capacity of available tooling or when using a 1/2 inch capacity drill press, milling machine, or hand-held drill. Typical applications include drilling ferrous metals, aluminum, copper, nickel alloys, magnesium, titanium, and synthetic materials in production, fabrication, and maintenance settings. The Weldon flat shank provides positive drive and minimizes bit slippage under load.

Key Features

• 21/32 inch cutting diameter with 1/2 inch reduced Weldon flat shank for use in standard 1/2 inch holders
• 118-degree standard point angle for general-purpose drilling across a wide range of materials
• High-speed steel construction provides durability in ferrous and non-ferrous metal drilling
• 3-inch flute length with regular spiral supports chip evacuation during drilling
• Bright, uncoated finish — no coating buildup to affect tolerances in precision applications
• Right-hand cut, 3-flat Weldon shank for positive torque transfer and reduced slippage

Compatibility

Designed for use in 1/2 inch drill chucks, milling machine spindles, and Weldon-style tool holders. Compatible with ferrous metals, aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic workpiece materials per Series R57 application guidelines.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling technician familiar with drill press, milling machine, or power drill operation. Ensure the machine spindle and Weldon holder are fully de-energized and locked out before inserting or removing the bit. Secure all Weldon flat set screws firmly before beginning any drilling operation to prevent bit pullout under load. Verify workpiece is securely clamped and that feed rate and spindle speed are appropriate for the workpiece material and drill diameter before starting the cut.