Threaded rods & bolts

Frequently asked questions — Threaded rods & bolts

• How do I choose the appropriate strength class for my steel bolts?

  The choice of strength class depends on the mechanical constraints applied to the assembly. In accordance with the ISO 898 standard, steel parts are classified as 8.8, 10.9 or 12.9. It is necessary to evaluate the load borne by the structure in order to select the appropriate class. A rigorous selection ensures the mechanical integrity of the assembly under the anticipated industrial operating conditions.
• What is the difference between an ISO 4014 and an ISO 4017 hexagon head screw?

  The main distinction between these two references concerns the threading. The ISO 4014 standard applies to hexagon head screws with partial threading. Conversely, the ISO 4017 or DIN 933 standard defines the specifications for hexagon head screws with full threading. The choice between these two types depends on the thread length required by your specific industrial assembly configuration.
• Why combine ISO 4032 nuts with ISO 7089 flat washers?

  Pairing hexagon nuts conforming to the ISO 4032 standard with flat washers compliant with the ISO 7089 standard is recommended to optimise tightening. Flat washers ensure even distribution of the forces exerted on the substrate during tightening. This combined assembly promotes effective preload retention within the joint, thereby preventing premature loosening of the components within fastening systems.
• What are the criteria for selecting a fastener within the MecaIndus range?

  The selection of a fastener must meet three fundamental technical requirements: mechanical constraints, the nature of the substrate and environmental conditions. The MecaIndus range offers a variety of typologies, including metric pitch screws, hexagon head screws, nuts and washers. It is essential to analyse these parameters in order to choose between products from the brands VISWOOD, MUSTAD, REISSER, SCELL IT, SPAX, GENERIQUE, INDEX FIXING or VISSAL.