DIN 6319 Spherical Washers (Type C) and Conical Slot Washers (Type D)

Spherical washers (type C) as defined in the DIN 6319 standard published by the German Institute for Standardization (DIN), as well as tapered slot washers (type D), also known as spherical washer sets, self-aligning washers or compensating washers. Such washers can be used individually, but are often used as an assembly for applications where the clamping surfaces are not parallel to each other or on uneven surfaces. The washer assembly consists of a convex (male) upper half and a concave (female) lower half. While both have the same radius, the upper washer has a slightly narrower identity than the lower washer. This allows a bolt or screw to pass through both washers and automatically adjust or self-align to compensate for any angular misalignment between the clamping surfaces. The spherical washer sets are designed to allow a correction angle of approximately 3 degrees. Any slight angular deviation can be compensated for when used with the hexagonal nut defined in the DIN 6330 standard with ball adjustment. In this case, the male washer (type C) is unnecessary.

The requirements for spherical washers are included in the DIN 6319 standard under the following headings:

• Mechanical properties of stainless steel for spherical washers
• Chemical composition of stainless steel for spherical washers
• Mechanical properties of steel for spherical washers
• Chemical composition of steel for spherical washers

Spherical washers are used to center the load on a bolt when two bearing surfaces are angled. These washers consist of two parts in spherical contact that adjust themselves to allow for any deflection of the bolt in the horizontal or vertical direction. They are used at points and transitions on inclined surfaces.

Spherical washers are designed to form a full, parallel plane between the bolt head and the face of the nut. These washers automatically adjust and compensate for the angular deviation between planes and prevent the bolt from twisting.

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