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Bolt and Nut Anchor/Chain Shackles provide the most secure pin arrangement and will resist axial loading and torsional loading, but should only be used in applications where shackle is infrequently or never removed. All shackles meet or exceed Federal Specification RRC-271D. Working Load Limit and traceability codes shown as permanent marking on body and pin. Available in painted, galvanized and self-colored finishes. All shackles have alloy quenched and tempered pins. Shackles made from technically advanced micro alloy material. Load break tests consistently show micro alloy outperforms quenched and tempered carbon material. Shock load testing of assemblies at -30ºF consistently demonstrate micro alloy outperforms quenched and tempered carbon material. Shackles exhibit extreme deformation before failure. Special testing and certification including magnetic particle, proof load, and fatigue test available upon request at time of order. Special products engineering available to fit your special lifting, tie down, and pulling needs. Design factor 6:1.