Aluminum Track Tiedown Fitting 6,500 lb Capacity - Tiedowns 12-Pack - No Ring This listing is for twelve (12) triple stud fittings with a RATED CAPACITY* of 6,500 lbs. The W.L.L.** (working load limit) is a 2,166 lb. capacity. This fitting fits all aluminum track that is similar to the track shown in the secondary image above. We refer to the track as aluminum load track. It is also commonly referred to as airplane track, seat or simply S track. *RATED CAPACITY: Also known as assembly capacity or break strength is the minimum load a complete assembly can withstand before failure in a laboratory pull test when the product is new. **W.L.L. The maximum load weight a tie-down should be subjected to during normal use. To assist in making the proper tie-down choice the Federal D.O.T. requires the W.L.L. to be 1/3 of the Rated Capacity. The fitting is SPRING LOADED to permit simple attach and detach operation. To detach, simply pull up on the spring loaded mechanism and then slide forward or back and the fitting releases. To attach, rest the fitting in the load track, then push down on the base and push forward. Triple stud refers to the number of "fingers" that it captures when attached to the aluminum track. Base measures 2-1/2" long x 7/8" wide. Opening or eye is large enough to receive TWO standard tiedown hooks. The steel fittings is zinc plated to inhibit corrosion.