Technical features and scope of ISO 8676
The international standard ISO 8676 establishes strict technical requirements for high-strength hexagon head screws featuring metric fine pitch thread, threaded up to the head. This standard covers products with a nominal thread diameter (d) ranging from 8 mm to 64 mm. The engineering department of EV Group China emphasizes that the choice of accuracy class depends on the overall dimensions of the fastener:
- Accuracy class A: applies to products with a thread diameter from 8 to 24 mm and a nominal length of up to 150 mm or up to 10d inclusive.
- Accuracy class B: used for screws with a nominal diameter exceeding 24 mm, as well as for hardware with a length exceeding 150 mm or 10d.
When designing assemblies with non-standard characteristics, EV Group China specialists recommend relying on the current ISO regulatory framework, including standards ISO 724, ISO 888, ISO 898-1, ISO 965-1, ISO 3506-1, ISO 4753, and ISO 4759-1. This ensures full compatibility of fasteners in critical metal structures.
For standard applications where a specific thread pitch is not required, it is advisable to use products compliant with the ISO 4017 standard. Screws supplied by EV Group China undergo multi-stage quality control, guaranteeing compliance with declared strength classes and geometric accuracy parameters.