Transport Binder Grade 70 Chains and Chain Binders
Grade 70 chains and chain binders are heavy duty tie down equipment , both chains and binders are made of carbon steel or alloy steel, compare to tie down straps, the chains and binders have higher working load limit , if we compare 5/16” grade 70 chain(typical WLL 4700lbs)to 2 inch tie down straps with WLL 3333lbs , 3/8” chain(WLL 6600lbs) to 4” tie downs(5400lbs) , 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 WLL of 5/16” grade 70 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 .
According to NACM recommendations, the carbon steel used in making grade 70 chains should meet following criteria: no more than 0.35% Carbon, 0.040% Phosphorous and 0.050% Sulfur . 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 chains 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.
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