Precision Twist Drill 5999995 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999995 is a reduced shank twist drill bit designed for general-purpose drilling in a wide range of materials. It features a 41/64 inch cutting diameter with a 1/2 inch straight-cylindrical shank, allowing larger-diameter bits to be chucked in standard 1/2 inch drill chucks without requiring a larger machine. Manufactured from high-speed steel with a bright, uncoated finish, it delivers solid performance in ferrous metal, aluminum, copper, nickel, titanium, magnesium, and synthetic materials. The 118-degree standard point angle suits common production and maintenance drilling tasks across trade and industrial settings.

This bit is suited for machinists, pipefitters, electricians, and HVAC technicians who need to drill larger holes using equipment with 1/2 inch chuck capacity. The Series R56 designation places it in a well-established line of general-purpose jobber-style bits. Typical applications include drilling pilot holes, conduit knockouts, and structural holes in ferrous and non-ferrous materials where a full-size shank chuck is not available. The right-hand cut spiral flute clears chips efficiently during through-hole drilling operations.

Key Features

• 41/64 inch cutting diameter (0.6406 inch decimal) with a reduced 1/2 inch shank for compatibility with standard drill chucks
• High-speed steel construction for durability across ferrous and non-ferrous workpieces
• 118-degree standard point angle for general-purpose drilling without specialized grinding
• Bright, uncoated finish — no coating to chip or delaminate during regrinding
• Right-hand cut spiral flute with regular spiral geometry for consistent chip evacuation
• 6 inch overall length with 3 inch flute length supports drilling up to 3 inches deep

Compatibility

Designed as a general-purpose reduced shank drill bit compatible with any 1/2 inch chuck capacity drill press, hand drill, or milling machine. Suitable for use on ferrous metal, aluminum, copper, magnesium, nickel, synthetic, and titanium workpieces per ANSI standards.

Installation Notes

Installation is performed by machinists, maintenance technicians, and trade professionals using drill presses or power hand drills equipped with a 1/2 inch chuck. Ensure the machine is fully powered down and the chuck is secured before bit changes. Secure the workpiece firmly before drilling to prevent movement. Follow applicable shop safety and ANSI guidelines for rotating tool use.