1. Bolt (stud) requirements of the plasticity index, the higher the performance level, only a high level of material can be achieved. Low-grade materials only by reducing the tempering temperature to achieve strength requirements, but can not meet the plasticity, toughness requirements. Fastener testing, brittle fracture are judged as unqualified (even if the tensile strength to meet the requirements.) Steel structural bolts also provides the maximum tensile strength, is to ensure the plastic toughness of the bolt.
2. Nut mechanical properties depends on the nut hardness and nut height, nut wall thickness, so the material requirements are not high.Of course, the toughness of the nut requirements, should also be a higher level of material, such as Chemical fasteners nuts on toughness requirements on the provisions of a more advanced materials.
Post time: Sep-13-2022