A ratchet buckle, also commonly referred to as a ratchet strap or a cargo strap, is a type of hardware used for securing and tightening straps, ropes, or chains around cargo to prevent movement during transportation. It consists of a mechanism that allows the strap to be tightened by pulling on the end that feeds through the ratchet, but does not allow the strap to loosen once it has been tightened. This mechanism ensures that the load remains securely fastened and reduces the risk of damage or loss during transit.

Ratchet buckles are widely used in various industries, including logistics, shipping, and construction, for securing loads on trucks, trailers, and other vehicles. They are also popular in recreational activities, such as securing items on a roof rack or trailer. The design of ratchet buckles can vary, but they generally feature a durable metal or plastic construction to withstand the forces exerted during tightening and the stresses of transportation.