1, the purchase of buye crane hooks should have the manufacturer's certificate and other technical documents can be used; important departments to purchase lifting hooks such as: railways, ports, etc., hook factory to be strict inspection (testing).
2, the crane hook shall not affect the safety performance of the defects; hook defects shall not be welded; crane hook surface should be smooth, no cracks, folding, acute angle, burr, stripping, burning and other defects.
3, the shortest distance in the hook can be selected at two appropriate locations to print the mark is not easy to wear, measure the distance of the mark, as the use of detection of whether the change in the opening of the basis.
4, lifting hook material can be used 20 high-quality carbon steel or crane hook special materials DG20Mn, DG34CrMo made of forging, is strictly prohibited to use casting crane hook. The material of the crane hook is generally used A3, C3 ordinary carbon steel, or 16Mn low alloy steel
5, homemade lifting hook technical conditions should be consistent with GB 10051.1-88 ~ GB 10051.5-88 requirements (new standards: GB10051.1-2010 ~ GB 10051.5-2010)
6, the crane hook the vertical axis, must be located in the rolling direction of the steel plate, and the hook does not allow splicing.
7, the crane hook application capping rivet riveting, and in the crane hook and lifting material hanging point of contact with high stress bending parts shall not be connected with rivets.
8, plate crane hook laminations are not allowed to fully enclosed welding, only allow intermittent welding.
9, has been carried out over the load test crane hook should be used for scrapping.