Hooks – Quenched & Tempered. Shank, Swivel, & Eye Hook. Eyehook Design Factor: 5/1. (Except alloy 30 ton and larger are 4-1/2 to 1) Shank and Swivel Design Factor: 4-1/2 to 1. Nominal Size (in.) Diameter of Bow. Carbon Maximum Worit Load (Tons) de. Alloy Maximum Worit Load (Tons)