S-506 Duplex sleeves are recommended for use with 6 x 19 or 6 x 37, IPS
or XIP (EIP), RRL, FC or IWRC wire rope.
Before using any National Swage fitting with any other type lay, construction
or grade of wire rope, it is recommended that the termination be destructive
tested and documented to prove the adequacy of the assembly to be manufactured.