50 tons of disc towing hook
1.The surface of part must be finishing, can't have burr ,shot mark ,sharp corner ,split and the other macroscopic irregularity.
2.The forcing parts must be normalizing treatment before doing machine work.
3.All exteriority of part coat anticorrosive paint and all friction face of parts coat lube oil after acceptable test.
4.The test weight is 100t after disk hauling hook is finished . the time of testing isn't less than 5 minutes . all parts didn't have permanent deformation ,split and the other macula . you can change substandard parts for new parts ,then test again.