What is this metal ring for?


Old 06-16-16, 10:18 PM
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What is this metal ring for?

I have replaced a bunch of door locks in my properties and I have always thrown this part out. What is the purpose of this metal ring?

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Old 06-17-16, 04:08 AM
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Some door installations, like mobile homes, don't use mortised plates for the lockset. This ring keeps the plunger centered in the hole. For the most part they aren't used.
Old 06-20-16, 06:30 PM
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This is an adapter to convert to a "drive-in" latch, where, as Chandler indicated, the door edge is not pre-mortised for a latch-plate. It's a time/cost saving gimmick that usually results in a less secure installation.

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