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high strength polished steel lifting chain for load purpose ASTM A391 Standard Specification for G80 Alloy Steel Chain Name：ASTM A391 D NOMINAL SIZEWORKING LOAD LIMIT (MAX) PROOF TEST (MIN.)MINIMUM BREAKING FORCEMINIMUM WEIGHT PER 100FTL INSIDE LENGTH (MAX.)B INSIDE WIDTH RANGE MIN. TO MAX. INCHMMKGLBKNLBKNLBKGLB(min)MMINCHMMINCH 7/325.5970210019.0420038.084000.320.7117.60.697.14-08.2