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DIN 985

DIN 985 is a standard from the German Institute for Standardization (DIN) for self-locking hexagon nuts with a polyamide locking insert (also known as Nyloc nuts). This standard defines the dimensions, tolerances, and mechanical properties of these nuts, which are used in various mechanical and structural applications to prevent fastener loosening due to vibration.

Features and Dimensions

  • Available in various diameters, commonly ranging from M3 to M36

  • Hexagonal body with a polyamide locking ring that deforms during installation, creating a self-locking feature

  • The locking ring prevents unintentional loosening and ensures a reliable joint

Materials and Surface Treatments

  • Steel

  • Stainless steel (A2, A4)

  • Brass

  • Optional surface coatings include: zinc plating, black oxide, or chrome plating for increased corrosion resistance

Applications

  • Mechanical engineering: securing fasteners in machines and equipment

  • Automotive industry: fastening parts where vibration resistance is essential

  • Construction: securing structural connections in buildings and bridges

  • Household appliances: anchoring components in various appliances

Assembly and Use
When installing DIN 985 nuts, it's crucial to choose the correct size and material for optimal performance and durability. The polyamide insert must be intact upon first installation to maintain the self-locking property. Use a torque wrench to ensure proper pre-tensioning.

Conclusion
DIN 985 nuts are essential fastening components in many mechanical and structural applications. Their standardized dimensions and materials ensure a reliable, vibration-resistant connection that meets diverse application requirements.

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