Hydrogen crisp of test main is to test since attack screws is residues hydrogen in screws arrangements in the and the is will makes since attack screws attack crisp of, (General crisp broken not while on attack, and must Shi to must of stress only will appeared out) plating or put covered of screws should loaded into as table 3 by rules of test iron and steel business of flat China Division in the, outstanding head type screws head Xia bearing surface using specification of flat China Division, buried type screws using a phase tie of has pour angle distance steel tablets. Mounted on bearing surface of flat washers or the thickness of the distance pieces should be able to fit a maximum number of invalid length of screws. About half a tooth long screws, its stems can use a longer distance of cold-rolled steel sheet or flat washer support, to ensure the knot part thoroughly in a mergers and maintaining test plate thickness. Breaking torque of screws should be locked to a maximum of 80%, breaking torque to lock 5 screws to break with its average resolution, remain locked for 24 hours, then unscrew screws then spin to the original locking torque screws should be no significant loss.
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