HEX HEAD SCREW PARTIAL THREAD M5 X 30 - CLASS 8.8

Hexagon head screw M5 x 30 mm - Standard DIN 931, Class 8.8

The M5 x 30 mm hexagon head screw is an essential element in the mechanical assembly and fastening of metal parts or other resistant materials. Its partial threading and robust design ensure optimum tightening, guaranteeing excellent resistance over time.

M5 x 30 mm screw technical specifications

• Nominal diameter: 5 mm
• Length under head: 30 mm
• Head type: Hexagonal
• Standard: DIN 931
• Grade: 8.8
• Material: High-strength alloy steel
• Coating: Depending on the application, the screw can be ungalvanized, zinc-plated, dichromate-plated or stainless steel

DIN 931: a benchmark for hexagon screws

DIN 931 defines the characteristics of partially threaded hexagon head screws. It is widely used in industrial applications, structural steelwork, general mechanical engineering and automotive construction.

The main specifications of this standard include :

• A hexagonal head conforming to standardized dimensions to ensure compatibility with standard wrenches and sockets.
• Standardized metric threads to ensure precise, reliable assembly.
• A length under the head defined according to DIN standards to guarantee universal compatibility with the corresponding nuts and washers.

DIN 931 is widely used in the industry, as it guarantees the interchangeability of screws between different manufacturers and ensures that assemblies comply with quality and safety requirements.

Class 8.8: high mechanical resistance

Class 8.8 screws are manufactured from heat-treated alloy steel to provide high mechanical strength. The 8.8 classification refers to the mechanical properties of the steel used:

• The first number (8) indicates the screw's minimum tensile strength, i.e. 800 MPa (Megapascals).
• The second number (.8) indicates that the yield strength is 80% of the tensile strength, i.e. 640 MPa.

These characteristics give Class 8.8 screws a high capacity to withstand mechanical loads, making them ideal for applications requiring robust, long-lasting fastening. They are used in particular in :

• Steel construction
• Automotive engineering
• Manufacturing industry
• Assembly of structures requiring resistance to vibration and high mechanical stress

Conclusion

The M5 x 30 mm hexagon-head screw , DIN 931, class 8.8 is a reliable, hard-wearing fastener used in a wide range of industrial and mechanical applications. Thanks to its compliance with DIN 931 and its 8.8 classification, it offers optimum strength and guarantees safe, long-lasting assemblies.