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Cleat nut size?

Impelled

Jetboaters Lieutenant
Messages
118
Reaction score
94
Points
172
Location
Columbus, Ohio
Boat Make
Yamaha
Year
2006
Boat Model
SX
Boat Length
23
Okay, I’m confused....
The service manual says the nuts on my cleats are 5/16 X 18. I know the outside size is 1 1/4.
When doing a search I’m reading the inside diameter is 7/8 X 18 according to several threads.
Which is it? 5/16 doesn’t even seem close for the strength needed on a cleat. Even the manual gives the lock washer & washer as a 5/16....
I’m missing a nut & washers off a rear cleat and need to get a replacement.
TIA-
 
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