Precision Twist Drill 5999580 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999580 is a reduced shank twist drill bit designed for drilling through ferrous metals and a range of non-ferrous materials. It features a 1.0469-inch cutting diameter paired with a 1/2-inch Weldon flat shank, making it compatible with standard 1/2-inch drill chucks and milling-style holders without requiring a full-size chuck bore. The 118-degree standard point angle is suited for general-purpose metal drilling. Constructed from high-speed steel with a bright uncoated finish, this bit is built for production and maintenance drilling where consistent hole quality is required. Licensed HVAC, plumbing, and mechanical tradespeople will recognize this as a reliable general-purpose tool for structural and equipment work.

This drill bit is well suited for ferrous metal fabrication and general maintenance applications in residential and commercial settings. Secondary workpiece materials include aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic materials. The Weldon flat shank with three flats provides positive drive and prevents slippage under load. The 3-inch flute length accommodates drilling depths up to 3 inches, and the 6-inch overall length gives sufficient clearance for most benchtop drill press and hand-drill setups. Series R57 identifies this as part of PRECISION TWIST DRILL's reduced shank line conforming to ANSI standards.

Key Features

• 1.0469-inch (1-3/64 inch) cutting diameter with a reduced 1/2-inch Weldon flat shank for use in standard chucks
• 118-degree standard point angle for general-purpose drilling in ferrous and non-ferrous metals
• High-speed steel construction with bright uncoated finish for broad material compatibility
• Three Weldon flats on the shank provide positive torque transfer and resist bit pullout
• 3-inch flute length supports drilling depths up to 3 inches; 6-inch overall length
• Right-hand spiral flute with regular spiral type; conforms to ANSI standards

Compatibility

Designed for general-purpose drilling in ferrous metal as the primary workpiece material. Also rated for secondary materials including aluminum, cermet, copper, magnesium, nickel, synthetic materials, and titanium. The 1/2-inch Weldon flat shank fits standard 1/2-inch drill chucks and compatible toolholders.

Installation Notes

Installation of reduced shank drill bits should be performed by a qualified machinist or tradesperson using a drill press, magnetic drill, or hand drill with a properly rated 1/2-inch chuck. Secure the Weldon flat shank fully into the chuck or holder before applying power to prevent slippage under torque. Always wear appropriate personal protective equipment including safety glasses when drilling metal. Follow applicable ANSI and shop safety protocols for rotating cutting tools.