Greatly improves the durability of wire rope slings. The increase in shackle bow radius provides a 58 % gain in the sling bearing surface and eliminates the need for a thimble. Increases the usable sling strength 15 %. Forged alloy steel from 75 through 300 metric tons, and cast alloy steel from 400 through 1,000 metric tons.
大大提高了钢丝绳吊索的耐久性。吊环弓半径的增加使吊索支承面增加了58%,并消除了对顶针的需求。增加可用吊索强度15%。锻造合金钢从75吨到300吨,铸造合金钢从400吨到1000吨。