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If I understand correctly, one of the star's teeth is bent into one of 4 nut's slots to secure the nut. What happens if none of the teeth align with the slots? Do you unscrew the nut a bit? Or it is somehow mathematically made that there will always be one slot that aligns properly?

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    $\begingroup$ A starlock washer is a specific thing, and it’s not what you’ve pictured! $\endgroup$ – Jonathan R Swift Dec 22 '19 at 8:40
  • $\begingroup$ There are many types, this is one of them $\endgroup$ – user1477107 Dec 22 '19 at 11:53

See https://www.skf.com/us/products/bearings-units-housings/bearing-accessories/lock-nuts/requiring-keyway/installation-removal/index.html for installation instructions.

As you noted, the spacing can be set so that things are always pretty close. There are 19 tabs on the washer and four slots on the nut. The slot in the tread shown in figure 3 is wide enough to allow the washer to rotate slightly to relative to the bearing race, and this means the washer can always have one tab bent over.

A Starlock washer is a different item entirely - the teeth are on the inside and serve to limit axial movement of the washer in one direction, when placed over a circular shaft.

  • $\begingroup$ Won't that allow the nut to unscrew a little bit, until the inner tab meets the edge of the slot in the thread? $\endgroup$ – user1477107 Dec 23 '19 at 1:28
  • $\begingroup$ Yes, a little bit, but this is within tolerance for the applications where these washers are specified. $\endgroup$ – Jonathan R Swift Dec 23 '19 at 9:27

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