The commonly used national standards for nuts include GB41 Type I Hexagon Nuts - Grade C, GB6170 Type I Hexagon Nuts - Grade A, B, GB6171 Type I Hexagon Nuts - Fine Teeth - Grade A, B, GB6172 Hexagon Thin Nuts - Grade A, B - Chamfer, GB6173 Hexagon Thin Nuts - Fine Teeth - Grade A, B;
GB6174 Hexagon Thin Nuts - Grade B - No Chamfer, GB6175 Type II Hexagon Nuts - Grades A and B, GB6176 Type II Hexagon Nuts - Fine Thread - Grades A and B, GB6177 Hexagon Flange Nuts - Grade A, GB55 Hexagon Thick Nuts, GB56 Hexagon Extra Thick Nuts, GB1229 Large Hexagon Nuts (High Strength for Steel Structures).
The brittle fracture of national standard nuts due to hydrogen embrittlement is very sudden and unexpected, so the consequences caused by this situation are often very serious. Especially when safety is required, it is necessary to reduce the probability of hydrogen embrittlement. Therefore, it is a very important work to remove hydrogen embrittlement from electroplated nuts. The above is our manufacturer's introduction.