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  #11  
Old 01-25-2019, 02:52 PM
steve murray's Avatar
steve murray steve murray is offline
 
Join Date: Jan 2005
Location: Flat Rock, North Carolina
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Default OD of 5/16-18 Stud (31C-16)

Anybody know the specs for the OD of 5/16-18 stud (31C-16) on the bigger side of the stud that goes into the engine block. (My basic understanding is the side going into the engine block is slightly larger to provide locking mechanism.


I just received some and they are very loose. Old ones I pulled out measured about .310 new ones are about .307. I don't think my old ones (on new engine) were oversized, I am thinking these I bought off internet are junk\counterfeit?

Would appreciate someone measuring one of theirs or pointing me to a spec.
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  #12  
Old 01-25-2019, 08:38 PM
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az_gila az_gila is offline
 
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To be more specific on the driving specs for studs, here is the Lycoming document defining it.



Note that the torques are pretty low...
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  #13  
Old 01-27-2019, 09:31 PM
Sue Sue is offline
 
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Default Studs

Above table, is that fine or coarse threads ?
And really what?s wrong with thread locker ?
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  #14  
Old 01-27-2019, 10:38 PM
Bicyclops Bicyclops is offline
 
Join Date: Oct 2012
Location: LA, California
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Quote:
Originally Posted by Sue View Post
Above table, is that fine or coarse threads ?
And really what?s wrong with thread locker ?
Table V, studs minimum driving force. As stated before, if you get to the correct depth without reaching minimum torque, an oversize stud must be used.

What's wrong with threadlocker is that you may not be able to remove the stud later without pulling out the threads.

Ed Holyoke
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