FYI: thats not a castellated nut, rather a self-locking nut. And as mentioned, depends on the direction of rotation, what is actually turning, and the direction of the threads. However, they do use castle nuts/cotter pins on a number of rotating items with zero issues. For example, half the hardware on helicopters uses self-locking, castellated nuts with cotters pins to secure things.
That’s just because any nut that would go on a helicopter needs extra help.
Ha. But it does make you wonder why any nut that goes on an airplane needs that same extra help?
Depending on the rotation, using left handed threads can cause things to tend to tighten rather than backing out.
I’ve never made sense of that…the torque on the left pedal bolt is clockwise when you ride.Depending on the rotation, using left handed threads can cause things to tend to tighten rather than backing out.
It is common for one bicycle pedal to have left-handed threads for just this reason.
How to fit & remove pedals — 10 easy steps to pedal happiness
Learn the best way to fit your pedals so they'll be secure but easy to removeroad.cc
Helicopters are specialHa. But it does make you wonder why any nut that goes on an airplane needs that same extra help?
Depending on the rotation, using left handed threads can cause things to tend to tighten rather than backing out.
It is common for one bicycle pedal to have left-handed threads for just this reason.
How to fit & remove pedals — 10 easy steps to pedal happiness
Learn the best way to fit your pedals so they'll be secure but easy to remove
Its not based on torque, but some kind of eccentric loading from the force perpendicular to the threads. That's the high level hand wavey explanation and about as good as I am going to do
As mentioned it only has to do with the direction of rotation in relation to the thread pitch direction. If both were in opposite directions and not torqued properly the spinning portion could loosen the nut with no other safety device. Years ago vehicles had L/H threads on the driver side wheel studs for the same reason. However, with multiple studs rotating around a center point vs a single nut stud it became moot and was discontinued in the 60s-70s.
Only to the unanointed.
I resemble that remark.If you are unlucky, you will from time to time find LH threads on motorhomes well after that time period...changed a few tires for my family business in the 90s and you can do a lot of jumping on a breaker bar the wrong direction
