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Table – Working Load Limits (WLL) for Chain Chain Size in millimeters (inches) Unmarked Chain Grade 30 proof coil Grade 43 high test Grade 70 transport Grade 80 alloy Grade 100 alloy Chain Marking None 3, 30, 300 4, 43, 430 7, 70, 700 8, 80, 800 10, 100, 1000 7mm (1/4in) 580kg (1,300lb) 580kg (1,300lb) 1,180kg (2,600lb) 1,430kg (3,150lb)
For the purpose of acceptance testing of chain, a lot shall consist of 3,000 ft. (1,000 m) or fraction thereof of the same grade and size of chain. If a continuous length of chain exceeds 3,000 ft. (1,000 m), it is also considered a lot. At least one sample from each lot shall be tensile tested.
An improvement over High Test chain, Grade 70 Transport chain meets stringent Department of Transportation (DOT) regulations with a smaller, easier to handle chain. Identified with "L7" or similar grade marking. Supplied in yellow (gold) chromate finish for easy identification and rust prevention.
Welded Grade 70 transport chain allows a greater strength-to-weight ratio meaning lower costs and a lighter chain, for easier storage and handling. Significantly higher tensile strength for all load binding and tie-down applications, which permits you to hold a given load with the next smaller size chain than High Test.
Grade 70 welded assemblies have a load rating around 20% higher than Grade 43 assemblies, so a smaller size assembly can be used for many jobs.
A chain of Grade 70 is preferred for securing loads, but any grade can be used for tying downs or tensioning. It is imperative that you know your tensions in order to choose the correct chain. Additionally, PEER Chains offers chains that comply with API (American Petroleum Institute) standards.
The grade 70 chains are extremely strong for their light weight and are mostly used for loading on platform trucks in the transportation field. They are also widely used on farms, for wood transportation, towing and construction.
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