Table of Contents
U-Head Jacks (also known as fork heads) are essential adjustable components in scaffolding and formwork systems. Designed to securely support timber beams, LVL beams, or aluminum beams during concrete slab pouring, they are installed at the top of scaffolding standards. The U head safely cradles the beam or joist, while the threaded structure allows for precise height adjustment to level the platform. During construction, U-Head Jacks are compatible with various support systems, including steel props, formwork systems, and scaffolding systems such as Ringlock, Cuplock, Kwikstage, and Frame scaffolding.
U-Head Jacks from EK Scaffolding
U-Head Jacks supplied by EK Scaffolding are typically manufactured from corrosion-resistant steel. They feature galvanized or painted finishes to withstand harsh environments and ensure long-term durability. Specifications are designed to match the dimensions of formwork beams (including primary and secondary beams). Production strictly adheres to comprehensive QA/QC systems and ISO certification standards, and the products are tested to EN 12810 standards. Our adjustable U-Head Jacks are fully compatible with major global scaffolding systems.
Types of U-Head Jacks
Solid U-Head Jack: Offers maximum load-bearing capacity.
Hollow U-Head Jack: Provides a lighter-weight option without significantly compromising load-bearing performance.
Quick-Adjust Type: Designed specifically for Ringlock systems; features larger, wider-pitch threads for rapid height adjustment.
Extended U-Head Jack: Features pin holes, allowing it to function as an inner tube that fits into larger-diameter scaffolding standards.
Features and Specifications
Adjustability: Typically equipped with a threaded rod (solid or hollow) ranging from 24 to 36 inches in length, enabling precise leveling and height adjustment.
U-Head Dimensions: The fork or U-shaped opening at the top typically measures 8″ × 8″ or 8″ × 9″ to accommodate single or double load-bearing beams.
Compatibility: Seamlessly integrates with mainstream scaffolding systems—such as Ringlock, Cuplock, and Kwikstage—as well as traditional heavy-duty shoring posts.
Safety and Standards: Equipped with a nut stop mechanism to ensure minimum safe thread engagement; complies with OSHA (Occupational Safety and Health Administration) and ANSI (American National Standards Institute) standards.
Difference Between U-Head Jacks and Base Jacks
Although they look similar and both offer adjustability, their application locations differ completely:
U-Head Jack: Installed at the top of the vertical standard to secure and support overhead beams.
Base Jack: Installed at the bottom of the vertical standard; typically features a flat steel base plate that rests directly on the ground, primarily used to level the scaffolding foundation.
Applications of U-Head Jacks
U-head jacks (often referred to as U-head scaffolding jacks) are installed at the top of scaffolding standards to:
Support timber, steel, or aluminum beams
Secure beams within the U-shaped cradle to prevent displacement
Fine-tune the height of the formwork or shoring system
Typical U-Head Jack Components Include:
Threaded rod (solid or hollow)
Adjustment nut
U-shaped cradle (built to specific dimensions)
Typical Use Case:
At the top position, the primary challenge is beam positioning rather than ground leveling. The U-shaped cradle holds the beam in place, while the adjustment nut allows workers to make precise height adjustments.
For more information on high-quality adjustable scaffolding jacks, please contact us to receive further details.