The assembly of ratchet buckle and nylon or polyester webbing is the ratchet straps. The straps part of the assemblies can be made of nylon or polyester webbing , the safe load limit should be a few hundred pounds to thousands of pounds , the strap width can be 1 inch to 4 inches , both ends can be a loop, endless, double J hook , flat hook, spring e fitting, snap hook, chain extension,or the ends can have different set up.
The material people use to make ratchet buckle is steel, specifically carbon steel, but the ratchet handle can be aluminum or plastic coated, or just the steel, there is one kind of buckle called one piece ratchet buckle, which is all steel made.
Both nylon and polyester webbing are used to make the straps, but they have different characteristics, for shock absorption, we need nylon webbing and for tie down bulk loads we need polyester webbing straps, nylon webbing has better elongation than polyester while polyester webbing are stronger than nylon ones, in real world applications we need varieties, that is to say we need both nylon and polyester webbing straps for different needs .
Coated with suitable material, we can change the desirable characteristics , we can make more abrasion resistant, seal the straps to prevent corrosion, increase ultra-violet light resistance, increase or decrease coefficient of friction and more .
Of course the quality of the straps is the critical characteristic, to use these straps properly and safely is a must . Now we need to find low price yet high quality straps. Usually your local dealer will have quite some varieties of straps, and the quality probably is OK but the price will be somewhat high . Actually there is a better way to acquire these straps, you guessed it, online stores are probably the best place to find wonderful deals, not most of the time but you will always find what you need, and the overall experience will be pretty good if you do your home work before you go out to pick up a few tie down straps randomly.