The Expert 38 mm 3/4" square drive impact socket is a heavy-duty tool designed to transfer high torque from 3/4" square-drive impact wrenches and torque tools to 38 mm hex fasteners. Its primary use is for loosening and tightening large nuts and bolts in applications where pneumatic, hydraulic or battery impact tools are used rather than hand ratchets.

Manufactured from chrome‑molybdenum (Cr‑Mo) alloy steel and heat‑treated for strength and toughness, this socket is built to resist the repeated shock loading imposed by impact tools. The socket is supplied with a matt black phosphate / shot‑peened finish to provide corrosion resistance while avoiding the brittle chrome plating used on hand sockets. The internal profile is a 6‑point (hex) configuration designed to engage fastener flats securely and reduce the risk of rounding. The drive recess accepts a 3/4" (19.05 mm) square drive and is compatible with industry standard 3/4" impact guns, breakers and extensions; the socket is supplied to the dimensional and performance conventions called for by relevant DIN, ISO and BS socket standards for interchangeability and impact use.

Typical applications include heavy vehicle and truck maintenance, agricultural machinery repair, plant and industrial maintenance, construction equipment servicing and rail or marine work where large fasteners are common. The 38 mm size is frequently used on wheel nuts, suspension components and large structural bolting, making this socket a staple in workshops that service commercial vehicles and heavy plant.

Key benefits include the toughness and fatigue resistance of Cr‑Mo steel suited to impact duty, corrosion protection from the phosphate finish, and the 6‑point geometry which delivers better torque transfer and reduces fastener damage compared with 12‑point designs. Compatibility with standard 3/4" drives and common impact accessories means this socket integrates easily into existing tool sets.

Duchy Fasteners stocks the Expert range across common sizes and pack options; the 38 mm 3/4" drive impact socket (Draper code DR05069) is available individually and in assorted sets—please contact us for current sizes, stock levels and pack quantities.