Precision Twist Drill 5999886 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999886 is a reduced shank cobalt drill bit designed for drilling into ferrous metals, aluminum, and a range of non-ferrous and exotic materials. The bit measures 57/64 inch (0.8906 inch decimal) in diameter with a 1/2 inch straight-cylindrical shank, making it compatible with standard 1/2 inch drill chucks. Overall length is 6 inches with a 3 inch flute length. The 118-degree split point promotes accurate starting and reduces walking on entry. Cobalt construction provides heat resistance for demanding applications in production and maintenance environments.

This drill bit is suited for professional metalworking applications including fabrication shops, maintenance and repair operations, and industrial production environments. The reduced shank design allows a larger-diameter bit to be run in a 1/2 inch chuck, expanding the range of a standard drill press or handheld drill. Primary workpiece material is ferrous metal. Secondary workpiece materials include aluminum, copper, magnesium, nickel, titanium, cermet, and synthetics. The Series R56CO designation identifies it within the PRECISION TWIST DRILL cobalt reduced shank line.

Key Features

• Cobalt tool material for heat resistance and durability in hard and abrasive metals
• 118-degree split point for self-centering entry and reduced thrust
• Reduced shank (1/2 inch) allows use in standard 1/2 inch chucks for oversized hole drilling
• 3 inch flute length supports drilling depths up to 3 inches
• Bright/uncoated finish — no coating to chip or peel under heat
• Right-hand cut with regular spiral fluting for efficient chip evacuation
• Meets ANSI standards

Compatibility

Designed as a reduced shank replacement drill bit for use in 1/2 inch drill chucks on drill presses, magnetic drills, and handheld power drills. Compatible with ferrous metal, aluminum, copper, magnesium, nickel, titanium, cermet, and synthetic workpiece materials per Series R56CO specifications.

Installation Notes

Install and tighten securely in a 1/2 inch keyed or keyless chuck before operation. Ensure the workpiece is clamped or fixtured before drilling to prevent rotation. Use appropriate cutting fluid or lubricant when drilling ferrous metals to extend bit life, even though this bit is rated for dry use. Inspect the cutting edges before each use and replace if chipping or dulling is evident.