This is an 18 mm, 12‑point hand socket with a 3/8" square drive, designed for removing and tightening metric fasteners in confined spaces where repeated engagement and rapid rotation are required. The 12‑point profile allows the socket to engage a bolt head or nut on either the flats or the points, permitting use at smaller swing angles than a 6‑point design and making it suitable for cramped or awkward access.

The socket is manufactured from chrome‑vanadium (Cr‑V) steel and is heat treated to provide the toughness and wear resistance expected of workshop hand tools. It is finished with a polished chrome plating to resist corrosion and to aid cleaning after use. The tool conforms to common dimensional and performance expectations for hand sockets, produced to meet recognised DIN/ISO/BS metric socket standards so it interfaces correctly with standard 3/8" (9.5 mm) drive ratchets and torque wrenches. This item is intended for hand use only and is not rated for impact tools.

Typical applications include automotive maintenance and repair, light engineering and assembly work, plant and machinery servicing, HVAC and plumbing installations, and general industrial maintenance. The 18 mm size is widely used on engine components, suspension and brake assemblies, and many M‑series metric fastenings found across manufacturing and agricultural equipment. The 12‑point geometry also works well with fine‑pitch and shallow‑head fasteners where multiple engagement angles are advantageous.

Key benefits of this socket include good corrosion resistance from the chrome finish, the strength and fatigue resistance of heat‑treated Cr‑V steel, and broad compatibility with 3/8" drive toolsets and torque tools (within hand‑tool torque limits). Its 12‑point design reduces the need for repositioning in limited clearance situations and helps speed up routine fastening tasks.

Duchy Fasteners stocks this 18 mm 12‑point 3/8" drive socket in single pieces and bulk packs, and carries a full metric socket range across various drives and lengths to suit workshop and trades use. Please contact us for pack sizes and availability.