This is a 36 mm impact socket with a 3/4 inch square drive, designed to be used with pneumatic, battery or electric impact wrenches for the removal and installation of large hex fasteners under high torque. Its primary use is in heavy-duty applications where a conventional chrome-plated socket would not withstand repeated shock loading.

The socket is manufactured from chrome‑molybdenum (Cr‑Mo) alloy steel (commonly equivalent to SAE 4140), heat treated for toughness and resistance to fracture. The working profile is a 6‑point (hex) opening to engage the flats of hexagonal nuts and bolts, reducing the risk of rounding compared with 12‑point designs. The drive is a 3/4" (19.05 mm) female square recess with a spring‑ball retention hole for secure attachment to impact anvils and extensions. The external finish is a black phosphate / manganese phosphate coating typical for impact tools, providing oil retention and improved corrosion resistance compared with bare steel while avoiding the brittle chrome plating used on hand sockets. Dimensions and tolerances are produced to industry socket standards (DIN/ISO/BS dimensional conventions for drive and socket interfaces) so the socket is compatible with standard 3/4" impact tools and accessories.

Typical applications include heavy vehicle wheel and hub work, agricultural and construction machinery maintenance, plant and mechanical engineering, rail and dockside maintenance, and any site work requiring high torque for large fasteners. The 36 mm size is commonly used on commercial vehicle wheel nuts and large structural bolts.

Key benefits of this impact socket are its Cr‑Mo alloy construction for improved impact strength and fatigue resistance, the protective black phosphate finish that reduces corrosion and surface wear, and the 6‑point profile that gives better face contact and reduces fastener damage. Compatibility with standard 3/4" impact wrenches and secure spring‑ball retention make it suitable for rapid, safe use on-site.

Duchy Fasteners stocks this Draper Tools Group D impact socket (DR28777) individually and in trade packs, and carries a broad range of Draper impact sockets across 1/4", 3/8", 1/2" and 3/4" drive sizes to suit workshop and mobile toolkits.