What best describes a through stay?

A through stay is best described as a rod threaded on both ends, connecting tube sheets. This type of stay plays a crucial role in maintaining the structural integrity of boilers, particularly in fire tube and water tube designs. By connecting the tube sheets, through stays help to distribute the pressure exerted by steam or water within the boiler, preventing deformation and ensuring proper functioning.

The function of a through stay is critical, as it provides stability and support to the boiler structure, especially in areas where high temperatures and pressures are prevalent. The design of the threaded rod allows it to be securely fastened, creating a strong connection that is essential for safety and efficiency in boiler operations.

Understanding the role of such components is significant in the study of stationary engineering, as it directly relates to how various parts of a boiler interact with each other under operational stresses.