What sort of nut do VANS intend should be used here?

[Steve Sampson]

What sort of nut do VANS intende should be used here? (middle of picture)
I am talking about the nut that retains the steel pin that stops the break assembly rotating on the axle. My RV4 plans indicate a 1/4-20 (coarse thread) , but my question is should it be a nylock or steel? I am concerned that under hard braking it might get quite warm and the nylock fail. Thoughts?

 

[Geico266]

My vote is for a nylock nut. It is not gonna get that hot on the end of the bolt. The brake cylinder o-rings would fail long before the nut falls off.

 

[Mel]

Nylock nuts are fine here.

 

[Steve Sampson]

Larry/Mel. thanks for your inputs. Nylock it is.

 

[plehrke]

AN363

Remember you can always use an AN363 self locking nut if you are concerned about elevated temps. They are good to 450 deg F.

 

[Doug]

BTW these are 1/4 UNC nuts. Vans recently supplied me replacements that were nylocs for my RV-6.

The original steel s/l nuts cracked and split while threading the nuts on these stud bolts (zero torque applied). I suspect the bolts have slightly oversize thread.

Doug Gray