The ratchet straps are just the assemblies of ratchet buckle and tie down webbing, but if we use cam buckle in place of ratchet buckle in the assembly we have cam buckle tie down, it’s as simple as that. Cam buckle tie downs are only for light duty use, and 2” cam buckles are the biggest size we will see in the real world use, and it’s still light duty. Unlike cam buckle, ratchet buckle are much stronger, and 2”,3” and 4” ratchet buckles are used in industrial grade applications, such as heavy duty transportation, the typical working load limit for 2” tie downs is 3,333lbs, for 3” and 4” which is 5,400lbs, since these tie downs have design factor of 3:1, the minimum tensile strength is 10,000lbs and 16,200lbs.
Up until now what we described is the tie downs for flatbed or similar transportation vehicles, there are another category of ratchet straps for semi trailers, ratchet e track straps, these tie down equipment will be used with E Tracks installed inside the semi trailer. It is estimated that 80% trucks are box trucks, and the e track tie down system is just for box trucks , so e track straps are most popular tie down straps. And these straps are not as strong as the one we use on flatbed truck, the working load limit of typical e track straps is 1,000lbs, with minimum breaking strength of 3,000lbs. It’s understandable that e track straps have lower working load limit, because the box truck wall will provide strong support for the loads inside, and the truck wall will prevent the loads from falling off, rolling over, tilting and some other dangerous movements. Coupled with e track cargo bar, rope tie off, e track hardware(such as D ring with E fitting), shoring beam, e track tie downs can be used to secure any kind of loads, and secure them reliably, but you still have to pay close attention to the safety of your cargo, easy to secure is not an excuse for lousy tie down practice.
In first paragraph we talked about design factor of ratchet tie downs, which is 3:1, so the working load limit is 1/3 of maximum breaking strength for ratchet straps, for comparison purpose we know that the binder chain has a design factor of 4:1, which basically says that for the chains the working load limit will be 1/4 of their breaking strength, which indicates that tie down chains are designed for tougher environment than Tie Down Straps are in. Nylon and polyester webbing are used in making tie down webbing, for different applications people will choose different material accordingly. Polyester webbing is almost perfect for tying down logs while nylon webbing is for small and light cargo. Following watch list is essential for making tie down webbing, abrasion, elongation, breaking strength and use environment. There are mandated criteria for breaking strength and elongation of the tie down strap, while the abrasion and environment are mostly estimation and subjective sometimes, different area may have different requirements. Therefore the manufacturer may have to make these tie downs to different standards.
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