A container dolly is an articulated trolley with wheels (casters) attached to the bottom of the carrier that carries containers to be loaded onto an aircraft. Passenger baggage is stored in containers and transported between the airport and the aircraft. It has no power of its own and is usually used by linking several dollies together with a towing vehicle. In addition, in order to improve work efficiency, the upper part is equipped with a turntable with rollers for sliding the container, and it is designed to rotate every 90 degrees. Hardlock nuts are used to fix the support guide rollers of the turntable.

In the following cases, the supporting guide is subjected to vibration and shock due to the large load of the container, causing loosening.
・The towing vehicle moves in the airport.
・Loading and unloading containers.
・The turntable rotates.
・A container moves between dollies.

• Loosening of screws has been eliminated, and on-site maintenance work (retightening) has been greatly reduced.
• By extending the maintenance cycle, the operation rate of the container dolly improved dramatically.
• Frequent retightening in hard-to-reach places is eliminated, greatly reducing the physical burden on maintenance workers.