A325 Tension Control Bolts

A tension control bolt, often referred to as a TC bolt, is a type of fastener designed for specific applications that require controlled and consistent tension or preload in the bolted joint. These bolts are used primarily in structural and construction projects where reliable and predictable clamping force is essential for the safety and integrity of the structure. Key features of tension control bolts include: Shear Groove: Tension control bolts have a unique design with a shear groove located just below the bolt head. This groove is engineered to shear off at a predetermined torque level during installation, ensuring that the desired tension is achieved. Squirter Nozzle: TC bolts typically come with a squatter nozzle, which facilitates the lubrication of the threads during installation. Lubrication is crucial for achieving consistent tension and preventing galling. Controlled Preload: The design of tension control bolts allows for the precise control of the clamping force or preload, which is important for ensuring the structural stability of the assembly. Washer: Tension control bolts are often used in conjunction with a specific type of washer that helps in achieving the desired tension and also prevents over-tightening. High-Strength Materials: These bolts are typically made from high-strength materials like medium carbon steel or alloy steel to meet the demanding requirements of structural applications. Tension control bolts are commonly used in the construction of bridges, buildings, and other critical structures where consistent and controlled tension is crucial for the safety and performance of the assembly. They are installed using specialized equipment designed to shear the shear groove at the appropriate torque, ensuring the desired preload is achieved.