This is an 18mm impact socket designed for use with 1/2" (12.7mm) square drive impact wrenches and rachet handles. Its primary use is to apply and remove 18mm hex fasteners under high torque and repeated impact conditions typical of workshop, garage and site maintenance work.

The socket is manufactured from chrome‑molybdenum (Cr‑Mo) alloy steel and is heat‑treated to provide the toughness required for impact applications. The exterior is finished in black phosphate to offer corrosion resistance and to distinguish it from chrome‑plated hand sockets. The socket features a 6‑point hex profile to reduce the risk of fastener rounding and to give secure contact with bolt heads. The drive connection is a 1/2" square recess with a spring ball detent to retain the socket on the anvil of the wrench. Dimensions and drive interface conform to common DIN/ISO socket dimensional standards (e.g. ISO/DIN 1/2" square drive socket equivalents) and are compatible with BS and ISO rated 1/2" impact tools.

Typical applications include automotive repair and tyre fitting, commercial vehicle and plant maintenance, agricultural machinery servicing, construction equipment work and general industrial assembly or disassembly where impact tools are used. The 6‑point geometry is particularly suitable for hexagon bolt heads and cap screws, while the Cr‑Mo construction resists cracking under repeated shocks from pneumatic or electric impacts.

Key benefits of this 18mm impact socket are its enhanced toughness compared with non‑impact sockets, solid compatibility with 1/2" drive impact wrenches and improved corrosion protection from the black phosphate finish. The socket’s 6‑point design reduces fastener damage compared with thinner 12‑point profiles and its detent groove ensures safe retention on the tool anvil during use.

Duchy Fasteners stocks this item in single pieces and bulk packs; our metric impact socket range covers common sizes from small to large (for example 8mm up to 32mm) and is available in assorted or single‑size packs to suit trade and workshop requirements. If you need a different size or pack quantity, contact our sales team for current availability.