Simply put, the UB Clevis is a connecting component. One end attaches to the cross-arm of a transmission tower, while the other connects to an insulator string. On power transmission lines, it serves the critical functions of transmitting mechanical loads, conducting electricity, and providing protective support. Though small in size, it plays a pivotal role.

Models and Specifications

The UB Clevis is available in several distinct models: UB-7, UB-10, UB-12, and UB-16. The higher the model number, the greater the tensile load capacity it can withstand.

For example:
Model: UB-7
Key Dimensions: 18mm × 16mm
Rated Ultimate Tensile Load: 70kN (approximately 7 tons of force)
Weight: 0.75kg (light enough to hold comfortably in one's hand)

Specifications vary for other models; the appropriate choice should be selected based on specific field requirements. For installations involving large spans or heavy-gauge conductors, a larger-capacity UB Clevis model should be selected. If you would like to learn more, please feel free to contact us at any time.

What does it look like? How is it installed?

The structure of the UB Clevis consists of two distinct sections: an upper end and a lower end:

Upper End: Features a long-shank bolt that inserts directly into the cross-arm for fixation. This bolt is designed for optimal load-bearing performance, utilizing a "double shear plane" configuration-meaning, simply put, that the bolt is supported by two contact surfaces, making it highly resistant to shearing failure.

Lower End: Features a slotted opening-available in both single-plate and double-plate configurations-designed to securely cradle the insulator string.

This design allows the upper end to pivot forward and backward, while the lower end pivots left and right, with the two axes of rotation positioned perpendicular to each other. What does this mean in practice? It ensures that no matter which direction the conductor swings, the clevis can move in tandem, preventing any rigid binding or mechanical stress on the assembly.

The UB Clevis is primarily utilized in conjunction with suspension clamps across various voltage levels, typically serving as the "first link" in the complete insulator hardware string assembly.

How does it differ from an Angle Clevis?

Angle Clevis: Designed to redirect the connection axis by a 90-degree angle.

UB Clevis: Designed to transmit force in a straight line, without any directional change.

Simply put: The Angle Clevis acts like a pipe elbow, whereas the UB Clevis acts like a straight-through coupler.

In practical application, the UB Clevis is commonly found in jumper assemblies, while the Angle Clevis is deployed in locations where a change in direction is required.