ISO 8674 is an international standard that specifies the requirements for high hexagon nuts (type 2) with a fine thread. This standard establishes precise dimensions, shapes, materials, and other characteristics that nuts must meet to ensure their interchangeability and reliability in various connections.
Technical Characteristics of ISO 8674
- Dimensions: The standard details the nominal diameter, height of the nut, thread pitch, and other critical dimensions.
- Manufacturing Tolerance: Allowable deviations from the nominal dimensions are defined to ensure the correct functioning of the nut in the connection.
- Materials: ISO 8674 specifies the primary materials used for manufacturing nuts, such as carbon steel, stainless steel, and other alloyed steels.
- Strength Grades: The standard classifies nuts according to their strength, which is determined by the yield strength of the material. The most common strength grades are 8.8, 10.9, and 12.9.
- Coatings: For corrosion protection and improved appearance, nuts can have various types of coatings, such as zinc plating, cadmium plating, or passivation.
Strength Grade of ISO 8674
The strength grade of a nut indicates its ability to withstand loads without deformation. For example, a grade 8.8 nut has higher strength than a grade 5.6 nut.
Fastener Group
ISO 8674 nuts are typically part of a fastener group that also includes bolts with corresponding threads. This ensures the compatibility of nuts and bolts from different manufacturers.
Manufacturing Materials
The primary materials for manufacturing ISO 8674 nuts are carbon steel and stainless steel. The choice of material depends on the operating conditions of the connection (temperature, aggressive environment, etc.).
Application
ISO 8674 nuts are widely used in various industries:
- Mechanical engineering: For fastening parts of machines and mechanisms that require high strength and reliable connections.
- Construction: For connecting metal structures, especially in conditions with increased strength requirements.
- Automotive industry: For fastening vehicle parts that are subjected to significant loads.
Advantages of Using ISO 8674 Nuts
- High strength: Due to their design and materials, the nuts provide a reliable connection even under significant loads.
- Interchangeability: Can be used with bolts from different manufacturers.
- Wide range: Available in various sizes and strength grades.
- Vibration resistance: Due to the high height of the nut, the connection is more resistant to vibrations.
