Chicago Hardware drop forged heat treated shackles
Size, working load limit, and trademark are permanently marked on all shackles. All shackles and pins are heat treated. Loads are based on a safety factor of 6 to 1. When tested all shackles are pulled at a uniform rate of speed in a direct tension. Shackles meet Performance Requirements of Federal Specifications RR-C-271D Type IVA*
CHH201155 5/16" 3/4 ton