What steps should be followed when utilizing Torque-to-Yield fasteners?

When dealing with Torque-to-Yield fasteners, the correct approach involves initially applying torque to a defined specification followed by rotating the fastener a specified number of degrees beyond that initial torque. This process is essential because Torque-to-Yield fasteners are designed to stretch when installed, ensuring a tighter and more secure fit as they settle into place.

Starting with the specified torque establishes a base level of clamping force, while the subsequent degree of rotation ensures that the fastener deforms slightly beyond its elastic limit, effectively creating a "yield" condition. This method helps to achieve the necessary preload that maintains joint integrity under varying conditions.

Other options, while they may include relevant actions, do not follow the correct sequence or may omit essential steps in the utilization of these special fasteners. For instance, simply lubricating threads and torqueing or just rotating without the initial torque measurement might not provide the necessary fastening characteristics, potentially leading to failure in the joint. Hence, following the procedure of torquing and then rotating ensures that the Torque-to-Yield fasteners perform as intended, thereby maintaining safety and reliability in the assembly.