The grade refers to the tensile strength of the chain.
Grade 70 vs grade 43 chain.
It should not be used for overhead lifting.
Grade 70 chain typically has a 20 higher working load limit than high test chain or grade 43 chain.
Therefore grade 70 chain is not intended for overhead lifting.
This is expressed in newtons per square millimeter a newton is approximately 0 224805 lbs.
Grade 70 chain or g70 is constructed of high strength heat treated carbon steel.
The higher the grade number the more steel alloying elements it contains and the more resistant it is to the variety of loads a chain encounters especially.
4 thoughts on chain grades.
G70 binder chains are also referred to as tow chains or transport chains spectrum 7 or system7.
Industrial chain is rated by grades.
The thing you have to watch with h f.
The grade 70 is 5 16 and is rated at 4700 lbs the grade 43 is 3 8 and is rated at 5400 lbs.
The increased strength of grade 70 chain allows for easier handling and the reduced number of chains required by the north american standard for.
Shop grade 70 chain.
Grade 30 aka proof coil has less carbon and is good service duty chain.
This chain will elongate before breaking but does not have the properties needed for overhead lifting.
April 24 2018 at 1 39 pm.
Grade 80 and grade 100 are specifically designed for safety and approved by osha and other governing agencies for overhead lifting.
We hope this is helpful let us know if you have any other questions.
Carbon grade 70 chain is a heat treated carbon steel chain that has no alloying elements added to the steel.
Comparing grade 30 grade 43 grade 70 grade 80 grade 100 and grade 120 chain paul hepworth says.
Grade 70 chain is not approved for overhead lifting.
Grade 43 aka grade 40 has higher tensile strength and abrasion resistance and comes with a higher price tag.
G70 chain is rated at 700 newton square millimeter or 101 526 pound force per square inch.
Another problem some have with chain is they buy big heavy duty chain and hook it to the rub rail or some other weak point on the trailer.
Grade 70 chain was specifically designed for the transportation industry.
Grade 70 chain is a heat treated carbon steel which is not as strong as a grade 80 or grade 100 which are an alloy heat treated steel.
It is used by truckers loggers and highway crews for load securement towing lashing and as trawler chain.
