Grade 70 chains and load binders are heavy duty tie down equipment , both chains and binders are made of carbon steel, compare to tie down straps, the chains and binders have higher working load limit , say we compare grade 70 size 5/16” binder chain(which has 4700lbs WLL) to 2 inch tie down straps with WLL 3333lbs , 6600lbs 3/8” transport chains vs. 5400lbs 4” tie down straps , 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. 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.
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 , 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.
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 grade 70 chains and binders.
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