Chain Because of its flexibility and ability to follow contours readily, chain is a versatile medium for lifting, towing, pulling and securing, or for any application where a force is to be exerted. Its ability ot elongate prior to breaking gives the user adequate warning to remove it from service before bodily injury or property damage occurs. Welded graded chain is an industrial grade chain used extensively in rigging. All chains, and chain assemblies, sold by Acme Rigging are manufacturered in accordance with the NACM Specification for chain, ASTM standard A931 and ASTM Standard A413. The standardized grade designations are 30, 43 and 70 for carbon steel chain, and 80 and 100 for alloy steel chain. The grade number relates to the strength of the chain, with the grade number increasing as the strength of the chain increases. Only alloy chain, such as grade 80 or 100, is designed for overhead lifting. Other grade designated chains, not made from alloy steel, should not be used for lifting. • Grade 30 • Grade 43 • Grade 70 • Grade 80 • Grade 100 Chain Support • Care, use and inspection