Precision Twist Drill 5995482 Jobber Drill Bit 29/64 Hss

Product Description

The PRECISION TWIST DRILL 5995482 is a jobber-length, left-hand-cut drill bit designed for general-purpose drilling in steel and cast iron. Built from high-speed steel (HSS) with a bright, uncoated finish, it features a 118-degree standard point angle and a web-thinned, tapered web configuration that aids in chip clearing and reduces thrust at entry. The straight shank measures 29/64 inches (0.4531 inches) in diameter, matching the cutting diameter for direct chuck mounting. This bit is part of the Series L10 line and conforms to ANSI standards. It is sized at 29/64 inches diameter with a 5.625-inch overall length, making it well suited for production and maintenance drilling tasks performed by machinists, HVAC fabricators, plumbers, and electricians working with ferrous materials.

This drill bit is intended for use in ferrous workpiece materials, primarily steel and cast iron. It is a solid choice for drilling through structural steel, pipe fittings, sheet metal brackets, equipment housings, and similar trade applications. The left-hand cutting direction makes it especially useful for removing broken fasteners and studs, since the bit rotation tends to back out stuck hardware while drilling. The 9xD flute-to-diameter ratio provides adequate chip evacuation for the jobber-length format in typical hand-held or drill-press applications.

Key Features

• Left-hand cutting direction — assists in broken-fastener extraction during drilling
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• HSS construction with bright, uncoated finish suitable for general ferrous material drilling
• Straight shank at 0.4531 inches for direct, secure chuck mounting
• Regular spiral flute with 4.1875-inch flute length for effective chip evacuation
• Conforms to ANSI standards; Series L10 general-purpose grade

Compatibility

Designed for general-purpose drilling in steel and cast iron workpieces. Compatible with standard drill presses, hand drills, and magnetic drill units equipped with a chuck sized to accept a 0.4531-inch straight shank.

Installation Notes

Left-hand drill bits require a drill or drill press capable of reverse rotation — confirm the equipment direction before use. Secure the workpiece firmly before drilling to prevent movement, and use appropriate cutting fluid when drilling through thicker steel sections to extend tool life. Machining operations involving rotating tooling should follow standard shop safety practices, including eye protection and proper chuck tightening procedure. Always verify chuck capacity accommodates the full shank diameter before mounting.