Precision Twist Drill 5997151 Jobber Drill Bit 21/32 in

Product Description

The PRECISION TWIST DRILL 5997151 is a jobber length drill bit designed for general-purpose drilling in metal and hard materials. Built from high speed steel with a bright uncoated finish, it features a 135-degree split point and a parabolic spiral flute that promotes efficient chip evacuation and reduced walking on entry. The straight cylindrical shank measures 21/32 inches in diameter, matching the drill body diameter for direct chuck mounting. This bit is sized at 21/32 inches (0.6563 inches decimal) with an overall length of 7.125 inches and a flute length of 5.1875 inches, making it well suited for production drilling and maintenance work in trade and industrial settings.

This drill bit is appropriate for use on steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It follows the ANSI standard jobber length format and belongs to the QC21P series, which is rated for heavy duty general purpose drilling applications. Typical install scenarios include metalworking shops, mechanical contractors, and field service technicians drilling through structural steel, pipe flanges, or equipment housings. The 8xD flute-to-diameter ratio supports deeper hole applications within the rated maximum drilling depth of 5.1875 inches.

Key Features

• 21/32 inch (0.6563 inch) diameter high speed steel construction for heavy duty use
• 135-degree split point reduces thrust and minimizes bit walk on hard surfaces
• Parabolic spiral flute with web thinning improves chip flow and reduces heat buildup
• Straight cylindrical shank with zero flats for secure chuck grip
• Right-hand cut with tapered web configuration suited for steel, stainless, cast iron, and superalloys
• ANSI-compliant QC21P series rated for general purpose heavy duty drilling

Compatibility

Designed as a general purpose jobber length drill bit compatible with standard 3-jaw drill chucks and machine spindles accepting a 21/32 inch straight cylindrical shank. Rated for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium per primary workpiece material codes P, M, K, N, and S.

Installation Notes

Installation is performed by machinists, mechanical contractors, or qualified maintenance technicians using a drill press, magnetic drill, or handheld electric drill with a compatible chuck. Always secure the workpiece and ensure the chuck is fully tightened on the shank before operation. Use appropriate cutting fluid when drilling stainless steel, superalloys, or other hard materials to extend bit life and manage heat. Inspect the cutting edges for wear before each use and replace if chipping or dulling is observed.