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. Compare to cam buckle the ratchets are stronger and more widely used, the available sizes of ratchets are 1”,2”,3” and 4”, and the ratchet buckle generally has higher working load limit than the cam buckle, with 3,333LBS, 5,400LBS working load and a design factor of 3:1, these ratchets have 10,000LBS and 16,2000LBS breaking strength respectively, which are pretty strong for most tie down applications.
Of course what we discussed above is mainly for flatbed trucks and some other kind of vehicles, we will see there are other kind of trucks, the typical one is box truck, and most of them have E Tracks installed inside the truck, for these rigs we use e track straps. By estimation, there are almost 80% trucks on the road are box trucks, so these e track straps are supposed to the most popular ones by volume. With 1,000lbs safe load limit and 3,000lbs minimum breaking strength, e track straps are not as strong as flatbed tie down straps, 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.
As we described in the first paragraph, the design factor of ratchet straps is 3:1, that means the working load limit is 1/3 of the minimum breaking strength, in the mean time the design factor of grade 70 tie down chains is 4:1, so the chains can support heavier load, and are more resistance to abuse, such as high/low temperature, moisture, while tie down straps usually only work well under normal condition. 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 straps, 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.
Tags: e track straps, e tracks, ratchet straps, tie down straps, tie down webbing
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