An adjustable U-jack is a height-adjustable support fitting used to hold and level horizontal ledgers or transoms on uneven ground. It consists of a U-shaped cradle mounted on a threaded screw. The vertical tube of the scaffold rests in the U-shaped cradle, and the screw allows fine height adjustment to achieve a level working platform. Once set, it provides stable support for the scaffold structure and ensures even load distribution to the ground. Adjustable U-jacks are particularly useful in multi-level Cuplock scaffolding systems and formwork scaffolding, where precision leveling is required for safety and stability.