Grade 70 chain and chain binder are heavy duty tie down devices , both chains and binders are made of carbon steel, the WLL of the chains and binders are higher than most comparable tie down straps , say we compare grade 70 size 5/16” binder chain(which has 4700lbs WLL) to WLL 3333lbs 2” ratchet tie down straps , 3/8” chain(WLL 6600lbs) to 4” tie downs(5400lbs) , you can see that the chains are much stronger, and the load binders are even stronger than same size chains, 5/16”-3/8” load binder(lever or ratchet type) has WLL of 5400lbs and 3/8”-1/2” binder has WLL 9200lbs . If we examine the design factor of chains and tie down straps, we will see that chains and binders have 4:1 design factor while tie down straps have design factor 3:1, that’s another reason we consider chains and binders are heavy duty tie downs .
The material recommended by National Association of Chain Manufacturer to make grade 70 chains is carbon steel, the criteria for base steel is Carbon 0.35% max; Phosphorous 0.040% max and Sulfur 0.050% max. As long as the choice made by chain manufacturers meets the recommended criteria and the final products meet or exceeds DOT requirements(or CHP, California Highway Patrol, or some other mandated requirements), we can use these products for transportation purpose and don’t have to worry about inspections.
We use these heavy duty chains and binders to haul heavy equipment, for instance, backhoe, bulldozer, forklift, these big rigs are tough or straps, we have to use steel chains to tie them down , when we talk about backhoe, forklift, we need at least 3/8” grade 70 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.
Grade 70 tie down chain, also called transport chain, can be used on anything but overhead lifting, you need at least grade 80 alloy chains for overhead lifting. We see people use transport chains to drag the trees, tow the docks, and to tie down the logs out of the the trees, you can go around to find more creative uses of these chains and binders.