Grade 70 transport chain and ratchet chain binder are heavy duty tie down equipment , all these tie downs are made from steel, the WLL of the chains and binders are higher than most comparable tie down straps , let’s look at 5/16” transport chain(WLL 4700lbs) vs. 2” tie downs(typical WLL 3333lbs) , 3/8” chain(WLL around 6600lbs) to 4” tie downs(5400lbs max.) , you will see that compare to tie down straps, binder chains are much stronger, and chain binders are even stronger than same size chains, for instance, 5/16”-3/8” binder has WLL 5400lbs which is stronger than 4700lbs working load limit of 5/16” system 7 chain . Another reason chains and binders are considered heavy duty, is their design factor is 4:1 while webbing tie downs have 3:1 typical design factor, see “Design Factor” for reference .
These chains and binders are mostly used to haul big, heavy equipment, such as backhoe, bulldozer, these things are hard on straps, only carbon steel chains can sustain that kind of abuse , when we talk about backhoe, forklift, we need at least 3/8” system 7 chains and binders to secure them, for something which has less weight we consider 5/16” chains are good fit, of course we still have 1/2” and up chains and binders, these chains will most likely be used to tie down something out of ordinary, such as battle tanks, or some other applications require super heavy duty chains.
As we stated above, grade 70 chains , or say binder chains are used on a lot things except for overhead lifting. There are people who use these chains to tear trees, to tow mobile loading docks, a lot of forestry services use large quantity of these system 7 steel chains and binders .