CROSBY S-409 STOP SWAGE BUTTON Swage Button terminations have an efficiency rating of 98% based on the catalog strength of wire rope. Special processed, low carbon steel. COLD TUFF for better swageability. Stamp for identification after swaging without concern for fractures (as per directions in National Swaging Brochure). S-409 Buttons 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.