Will standard deadbolts and doorknobs work on a 7/8" thick security door?


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Old 05-17-23, 02:25 PM
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Will standard deadbolts and doorknobs work on a 7/8" thick security door?

Please help. I'm a DIY newbie. So this will be my first time replacing deadbolts and doorknobs, and I want to make sure I get the right size.

I've attached pics. Thanks in advance.



This is the distance between the deadbolt and doorknob on the security door.

This is the distance between the edge of the security door and the center of the deadbolt.

This is the thickness of the security door.
 
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Old 05-17-23, 04:19 PM
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No they will not work on that thickness.
 
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Old 05-17-23, 04:40 PM
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Do you know what size is needed based on those measurements?
 
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Old 05-17-23, 05:25 PM
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In addition to door thickness, you need to know the backset of the locks: the distance from the edge of the door to the center of the lock (the keyway is in the center of the lock). If it isn't 2 3/8", your choices will be extremely limited.

Knowing the size(s) of the holes in the will also be helpful. The knob hole should be 2 1/8". I'd guess your deadbolt hole is 1 1/2" or 1 5/8". You might find imports that will fit.
 
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Old 05-17-23, 06:09 PM
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@ThisOldMan: Thanks for the info. I appreciate all the help I can get.
 
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Old 05-19-23, 05:38 AM
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Thanks for the info. I appreciate all the help I can get.
I hate to tell you, but I think you're going to need it. That Weiser deadbolt was discontinued probably 40 years ago and finding something that will fit is not going to be easy, if possible.
 
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Old 05-19-23, 12:17 PM
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Can't tell by the pic, but these locks may have spacer rings installed to allow for that thickness. Standard locks can be used down to about 1-1/4" without spacers or "goof" rings. Here's where a locksmith can be helpful, as they carry selections of spacer rings for various branded locks to allow for narrow doors. By knowing the door thickness in advance, they can pre-assemble a lock on the bench, using spacers as necessary, to see what will work. And as ThisOldMan said, confirm your backset is 2-3/8" (residential standard) and the crossbore hole size being 2" or 2-1/8" for the knobset and the deadbolt size can vary from 1-1/2" to 2-1/8". Not all spacer rings work well for all deadbolt hole sizes.
 
 

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