This is a shackle pin nut used in the leaf spring suspension system of Series Land Rovers, securing the shackle pin that connects the leaf spring to the chassis or axle mounting point. The nut retains the shackle pin under constant load and movement, and using an incorrect thread type or worn nut can result in pin loosening, excessive shackle play, and compromised suspension geometry. This listing specifically covers the UNF (Unified National Fine) thread specification. Key Features UNF thread form - not interchangeable with UNS or metric variants used on other Series specifications Designed to secure the shackle pin through the spring eye and shackle plate assembly Correct OEM thread specification for UNF-equipped Series 2 and 2A suspension assemblies Inspect shackle pins, bushes, and spring eyes for wear when replacing - these components wear together Vehicle Fitment Fits Land Rover Series 2 and 2A (UNF specification only) and Series 3 vehicles, applicable to axle and suspension assemblies. Not sure about fitment? Feel free to get in touch at [email protected]