Century Drill 73308 No. 8 Spiral Flute Screw Extractor

Product Description

The CENTURY DRILL TOOL CO INC 73308 is a No. 8 spiral flute screw extractor designed to remove broken bolts and screws that have snapped off flush or below the surface of a fastening hole. The extractor handles bolt and screw sizes from 1-1/8 inches to 1-3/8 inches and can also remove 3/4-inch pipe. The required pilot drill bit size is 13/16 inches, and the manufacturer recommends using left-hand cobalt drill bits for best results. This tool is sold as a package of 2 units and weighs 1.74 pounds. It is used by mechanics, machinists, plumbers, and general trade professionals who encounter seized or snapped fasteners during service and repair work.

This extractor is suited for industrial, commercial, and residential applications where fasteners have broken off inside threaded holes, pipe fittings, or structural connections. Typical scenarios include engine repair, pipe fitting removal, and structural disassembly where conventional removal methods are not viable. The spiral flute design bites aggressively into the broken fastener as reverse torque is applied, making it effective on corroded or heavily damaged hardware.

Key Features

• Removes broken bolts and screws sized 1-1/8 inches to 1-3/8 inches
• Removes broken 3/4-inch pipe
• Spiral flute geometry applies aggressive grip under reverse torque
• Requires 13/16-inch pilot drill bit; compatible with left-hand cobalt drill bits
• Sold as a 2-piece package

Compatibility

Designed as an OEM-style replacement-grade extractor for use with any standard drill press, hand drill, or tap wrench capable of accepting the appropriate drive shank, when removing broken fasteners in the 1-1/8-inch to 1-3/8-inch bolt and screw range or 3/4-inch pipe applications.

Installation Notes

A licensed mechanic, machinist, or plumber typically performs broken fastener extraction as part of service or repair work. Before beginning, ensure the workpiece is secured and all system pressure or power is relieved. Drill the pilot hole to the recommended 13/16-inch diameter using a left-hand cobalt drill bit, then insert the extractor and apply steady counterclockwise torque. Do not apply excessive side load or hammer the extractor, as this can cause fracture inside the bore.