Precision Twist Drill 5999911 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999911 is a reduced shank twist drill bit designed for general-purpose hole-making in a wide range of materials. The bit measures 1-5/16 inches (1.3125 inches) in diameter with a 1/2-inch straight-cylindrical shank, allowing it to be chucked in standard 1/2-inch drill presses and portable drills despite its large cutting diameter. Constructed from high speed steel (HSS) with a bright, uncoated finish, the 5999911 delivers reliable performance in ferrous metals, aluminum, copper, and similar workpiece materials. The 118-degree standard point angle suits everyday drilling applications without requiring special point geometry.

This bit is suited for metalworking shops, maintenance and repair operations, fabrication environments, and trade professionals who drill large-diameter holes in steel, pipe, plate, or structural members. The reduced shank design is the key feature here: it extends the usable range of a standard 1/2-inch chuck to cut holes well beyond what a full-shank bit of equivalent diameter would require. The 3-inch flute length supports drilling depths up to 3 inches, and the 6-inch overall length provides clearance for most drill press setups and hand-drill applications.

Key Features

• 1-5/16-inch (1.3125-inch) cutting diameter with 1/2-inch reduced shank for use in standard chucks
• High speed steel construction for durability across ferrous and non-ferrous workpiece materials
• 118-degree standard point angle with right-hand spiral flutes for general-purpose cutting
• 3-inch flute length with maximum drilling depth of 3 inches
• 6-inch overall length; bright, uncoated finish
• Series R56; meets ANSI standards

Compatibility

Designed for use in any drill press or hand drill equipped with a 1/2-inch chuck. Compatible workpiece materials include ferrous metals, aluminum, cermet, copper, magnesium, nickel, synthetic materials, and titanium. No coolant system required.

Installation Notes

Secure the 1/2-inch shank firmly in a properly sized chuck before operation and verify the bit runs true before engaging the workpiece. Power down and de-energize the drill press or tool before changing bits. Clamp workpieces securely to prevent rotation during large-diameter drilling. Follow applicable shop safety protocols and use appropriate eye and hand protection when drilling metal.