DIN6797A External Tooth Lock Washers

DIN 6797A External Tooth Lock Washers feature teeth around the outside edge of the washer, creating multiple points of contact when compressed between the fastener and mating surface. The external teeth increase surface grip and help resist relative movement within the joint, while the flat washer body distributes the clamping pressure around the fastening area.

The compact design makes DIN 6797A washers suitable for applications where space is limited and a separate locking element is required. They can be used with bolts, screws, and nuts in a wide range of mechanical assemblies, with different materials and surface finishes available for different load and environmental conditions. Carbon steel, spring steel, and stainless steel options can be supplied according to the application. Zinc-plated or other protective finishes can be used for carbon steel versions, while stainless steel provides better corrosion resistance for demanding environments.

Specification:

DIN 6797A External Tooth Lock Washers are made from spring steel with a hardness of 350–425 HV (approximately HRC 36–43). This hardness range provides the washer with the resilience needed for the external teeth to maintain contact with the mating surfaces after tightening.

The washers are manufactured to the dimensional requirements of DIN 6797A, covering the inside diameter, outside diameter, thickness, and tooth configuration. The dimensional tolerance is size-dependent; for example, the inside diameter and outside diameter have specified minimum and maximum values rather than a single nominal tolerance. Carbon/spring steel versions can be supplied with plain, oiled, zinc-plated, or other protective finishes, while stainless steel options are available for applications requiring higher corrosion resistance.

Dimension Chart of DIN6797A External Tooth Lock Washers:

For each DIN 6797A size, the washer geometry changes with the matching thread diameter. The chart covers the inside diameter, outside diameter, material thickness, and number of external teeth, allowing the washer to be checked against the available fastening space and mating components. The dimensional limits are size-specific rather than based on one general tolerance. For example, the standard data gives different thickness tolerances for different sizes, while the number of teeth also increases as the washer diameter becomes larger.