Tie down chains and ratchet binders are heavy duty tie down equipment, these grade 70 chains and binders are made of carbon steel, the working load limit of the chains and binders are higher than most tie down straps , for instance, 5/16” transport chain(breaking strength 18,800lbs) vs. 2 inch tie down straps with breaking strength 10,000lbs , WLL 6600lbs 3/8” transport chains vs. WLL 5400lbs 4” tie down straps , you will see that compare to tie down webbing, 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 .
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. 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 , the most popular chain size for these kind of load are 3/8”, for some light equipment which is still too heavy and hard for straps 5/16” will be ideal chain size. 1/2” and up are mostly for really heavy stuff, for example, military applications, say to tie down battle tanks, you will definitely need 1/2” even 5/8” grade 70 chains to tie those bad boys down.
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.