有下述缺陷時,應報廢更換:
(1)表面有裂紋、破口或發裂者,應報廢;
(2)危險斷面磨損量超過原尺寸的10%,應報廢;
(3)危險斷面及鉤頸部產生塑性變形,應報廢;
(4)開口度比原尺寸增加15%,應報廢;
(5)吊鉤尖部扭轉變形超過10°以上,應報廢;
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