Precision Twist Drill 5999852 Reduced Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999852 is a reduced shank drill bit designed for drilling through ferrous metals and a wide range of secondary materials in trade and industrial settings. The bit measures 1.25 inches in diameter with a 0.5 inch straight-cylindrical shank, allowing it to chuck into standard 1/2 inch drill chucks despite its larger cutting diameter. Overall length is 6 inches with a 3 inch flute length. The 118-degree standard point angle and right-hand spiral flutes are ground from high speed steel, making this bit a reliable general-purpose tool for machinists, pipefitters, ironworkers, and maintenance technicians who need to drill oversize holes without a full-shank bit.

This bit fits applications where a 1.25 inch hole is required but the available drill press or hand drill accepts only a 1/2 inch shank. It is suited for ferrous metal fabrication, structural steel work, pipe and conduit layout, and general mechanical maintenance. Secondary workpiece materials include aluminum, copper, magnesium, nickel, titanium, synthetic composites, and cermet. The Series R56 designation places it within PRECISION TWIST DRILL's general-purpose reduced shank line, built to ANSI standards.

Key Features

• 1.25 inch cutting diameter with a 0.5 inch reduced shank for compatibility with standard 1/2 inch chucks
• 118-degree standard point angle for general-purpose drilling on ferrous and non-ferrous metals
• High speed steel construction provides heat resistance during extended drilling cycles
• 3 inch flute length supports a maximum drilling depth of 3 inches per pass
• Right-hand cut with regular spiral flutes for efficient chip evacuation
• Bright/uncoated finish — no coating buildup to affect dimensional tolerance

Compatibility

Designed as a general-purpose reduced shank drill bit suitable for use in any drill press or power drill equipped with a 1/2 inch chuck. Primary workpiece material is ferrous metal; rated for secondary use on aluminum, copper, magnesium, nickel, titanium, synthetic composites, and cermet. Built to ANSI standards per Series R56.

Installation Notes

Reduced shank drill bits are installed by trade professionals including machinists, millwrights, and pipefitters using standard drill presses or heavy-duty hand drills with a 1/2 inch keyed or keyless chuck. Secure the shank fully in the chuck and verify it is centered before drilling. Always clamp the workpiece — do not hand-hold metal stock during drilling. Follow applicable OSHA machine guarding requirements and use appropriate cutting fluid for extended cuts in hard ferrous materials, even though this bit is rated for dry use.