DIN 137
DIN 137 is a standard from the German Institute for Standardization (DIN) for spring washers, also known as locking washers. This standard defines the dimensions, tolerances, and mechanical characteristics of spring washers used to secure screw connections. Spring washers according to DIN 137 are available in various sizes and materials to satisfy different demands.
Properties and Dimensions
DIN 137 spring washers are classified into two main types:
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Type A: Domed spring washers
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Type B: Wave washers
These washers are available in different diameters, commonly from M2 to M36. Their shape produces a spring-like effect that secures the bolted connection and prevents loosening due to vibration.
Materials and Surface Treatments
DIN 137 spring washers are made from various materials to meet strength and corrosion resistance requirements. Common materials include:
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Spring steel
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Stainless steel
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Brass
They can also feature surface treatments such as galvanizing, blackening (bluing), or phosphating to enhance corrosion resistance.
Areas of Application
DIN 137 spring washers are used in many fields, including:
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Mechanical engineering: Securing bolted connections in machinery and equipment.
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Automotive industry: Securing screw connections in vehicles.
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Electrical engineering: Securing connections in electrical devices and enclosures.
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Construction industry: Securing structural connections in buildings and bridges.
Assembly and Use
When installing DIN 137 spring washers, it is important to select the correct size and material to ensure optimal performance and durability. The washers should be placed between the bolt head or nut and the contact surface to provide even pressure distribution and prevent loosening.
Conclusion:
DIN 137 spring washers are essential fastening elements in many mechanical and structural applications. Their standardized dimensions and materials ensure reliable and secure bolted connections across various use cases.