The grade directly indicates the breaking strength of the chain, serving as a safety criterion for selection. · Numeric grades (American/Universal standard): Such as G80, G100; the number represents the tensile stress at break (in N/mm² divided by 10). For example, G80 corresponds to 800 N/mm², while G100 corresponds to 1000 N/mm². Currently, G80 is the default choice for lifting operations. · Letter grades (European/ISO standard): High-precision chains are commonly denoted by M(4), P(5), S(6), T(8), V(10); the number following the letter has the same meaning. Chains with lower precision are simply indicated by numbers. · Important note: G30, G43, and G70 are carbon steel chains that must not be used for lifting operations above head level; they are only suitable for pulling or tying purposes.