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Old 07-07-2012, 06:16 PM
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Rule of thumb for minimum thread engagement is the diameter of a stud or bolt. If you have 3/8" studs, the minimum thread engagement is 3/8", 7/16" studs is 7/16" engagement and so on. In your case though, you need a minimum of 1/8" thread above the top of the nut to allow the locking part of the nut to be into the threads of the studs. The stock nuts are a "stover" lock nut which is nothing more than a slightly deformed nut and threads towards the top of the nut. This deformed area needs to be engaged on the threads of the studs to be effective.
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