A mortise cylinder lock nut and locating washer are used in cylinder dogging and signal switch applications. They are available as part of the CD/SS Cylinder Mounting Kit (part number 107813) from Von Duprin. They are also available sold separately: 050490 (locating washer) and 050526 (cylinder lock nut).
Here is a drawing showing all three components in the 107813 kit.
Here is a drawing with an exploded view of these components in a cylinder dogging trim scenario.
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