Metric thread screws

Frequently asked questions — Metric thread screws

• How do I choose between a partially threaded hexagon head screw and a fully threaded screw?

  The choice depends on the configuration of your assembly and the mechanical constraints applied. For partially threaded screws, we apply the ISO 4014 standard. Conversely, for fully threaded models, the specifications are based on the ISO 4017 standard or the DIN 933 standard. This distinction guarantees the dimensional compliance of the fastening according to the tensile or shear forces experienced by your industrial assembly.
• Which strength class should be chosen for highly stressed applications?

  For industrial applications subject to significant constraints, the mechanical characteristics of the steels must meet the classes defined by ISO 898. We offer screws in classes 8.8, 10.9 and 12.9. It is essential to select the class in line with the tensile or shear forces anticipated in your environment, in order to ensure the durability and integrity of your mechanical assemblies.
• Which accessories are recommended to optimise the tightening of metric thread screws?

  To guarantee an optimal distribution of tightening pressure, the use of complementary elements is recommended. It is advisable to use hexagon nuts conforming to ISO 4032 or DIN 934. In addition, the use of plain washers complying with ISO 7089 helps ensure the stability of the fastening. Strict compatibility of thread pitch between the screw and the nut remains a decisive criterion for the integrity of the assembly.
• Why is it crucial to check thread pitch compatibility before assembly?

  The compatibility between the screw thread pitch and that of the nut is a decisive criterion to guarantee the integrity of the fastening. A mismatch may compromise the mechanical performance of the assembly under the constraints encountered. When making your selection at MecaIndus, ensure that the elements, from specialised manufacturers such as FISCH, correspond precisely to the specifications of your application to avoid any defect during assembly.