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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. |
To be more specific on the driving specs for studs, here is the Lycoming document defining it.
![]() Note that the torques are pretty low...:) |
Studs
Above table, is that fine or coarse threads ?
And really what?s wrong with thread locker ? |
Quote:
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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