Grade 70 chains and ratchet chain binders are tough tie down equipment , both chains and binders are made of carbon steel, their working load limits are higher than their straps counterparts , say we compare grade 70 size 5/16” binder chain(which has 4700lbs WLL) to 2” tie downs(typical WLL 3333lbs) , 6600lbs 3/8” transport chains vs. 5400lbs 4” tie down straps , 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 . When the material meets NACM recommendation, the manufacturing process are under strict quality control, and the final products meet or exceed DOT requirements, you can put the chains and binders on your 18 wheeler and haul away.
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.
As we stated above, transport 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 grade 70 chains.
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