Prop shaft nuts

Thanks. I haven't seen that type of self-locking fastener before. This is the type I'm more familiar with, though I don't know if they are used on prop shafts:

 

Yah , the nylock is popular. The pellited locking nut for double nutting is a bit harder to find.

I normally have the machine shop custom pellit ss nuts. for mast rigging. They bore and thread a small...4mm ..hole into a nut, drive a threaded nylon screw into it, then cut off the head

They look like this


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One consideration about "bore and thread a small...4mm ..hole into a nut, drive a threaded nylon screw into it, then cut off the head" should be reduction in strength of the nut. The hole causes a stress concentration which could result in the nut splitting at a lower load. Whether it should be a concern would be application specific.

 

Sure...but remember a double locking nut is under very little load .

The primary nut is the one torqued

Exactly why engineers specify different types of fastenings is a mystery to me.

I simply duplicate the engineering supplied when performing service or repair.

.why are whitworth threads common on hydraulics ?

A mystery to me...

 

if you tighten a 2nd jamming nut on top of the main nut the the force will move the main nut along the thread and the locker holds all the load
nice article on that in proboat a while back

 

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So thin nut first

http://www.boltscience.com/pages/twonuts.htm

 

I always lap the prop and triple check the key has clearance and touch wood never lost one.

 

I lost a hydromar bow thruster prop one year. I fitted it. Embarrassing.


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