This is a 14 mm internal hex key socket with a 3/4 inch (19.05 mm) square drive, designed to fit on 3/4" drive ratchets, breaker bars and torque wrenches for access to 14 mm hex (Allen) fasteners. Its primary use is to apply higher torque to recessed hexagon socket head bolts and set screws where a standard Allen key cannot deliver sufficient leverage or where machine access requires a socket-mounted hex bit.

The socket is manufactured from chrome vanadium steel (Cr‑V), heat treated for toughness and long life. The external surface is chrome plated to provide corrosion resistance and to aid cleaning after use. The working end is a 6‑point internal hexagon (14 mm nominal) formed to standard dimensional tolerances for hexagon sockets. The drive is a 3/4" square recess to accept standard 3/4" drive tools; as a socket it has no threaded connection. The product conforms to commonly applied DIN/ISO/BS dimensional standards for 6‑point sockets and square drives, ensuring compatibility with industry‑standard ratchets and torque tools.

Typical applications include heavy vehicle and commercial plant maintenance, agricultural machinery, construction plant servicing, industrial maintenance and fabrication where large hexagon socket fasteners are used. The 3/4" drive size and robust Cr‑V construction make this socket well suited to workshops and maintenance engineers who need to apply high torque safely and reliably to recessed hex bolts.

Key practical benefits include the improved corrosion resistance from chrome plating, the strength and fatigue resistance provided by heat‑treated chrome vanadium steel, and compatibility with 3/4" drive torque tools for controlled tightening. The 6‑point hex profile reduces the risk of rounding compared with poorly fitting tools, and the socket form enables access to recessed fasteners in confined areas where a conventional key or Allen wrench cannot be used effectively.

Duchy Fasteners stocks this item (DR15551) in single pieces and as part of 3/4" drive socket sets, and we carry a broad range of metric hex key sockets in multiple sizes to suit workshop and industrial requirements. Please contact us for available size ranges and pack quantities.