On May 3, 11:48*am, "SteveB" toquerville,utah@zionvistas wrote:
"BobR" wrote in message

...
On May 2, 6:14 pm, dpb wrote:





BobR wrote:

dpb wrote:
BobR wrote:
...
Let me put it this way...I am building an airplane and using the nylon
insert nuts for most applications with a few critical exceptions where
only a castle nut and cotter pin is acceptable. I don't use and
wouldn't even consider using lock washers on anything. ...
I don't know airframe rules, but if you mean "anything" within the
ordinary English meaning, that's simply silly...

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When building a plane, if the screw or bolt is important enough to
have any lock washer it is important to make sure you use one that
won't come loose. If you consider that silly, do your wife and all of
us on the ground a favor and don't build yourself an airplane.

You obviously didn't _read_ or at least comprehend what I wrote...

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I read it, understood it completely and really considered you rather
silly for having written it. *You had nothing useful to add so you
wasted everyones time.

WOW. *From now on when I go on a plane, I'm going to look to see what kind
of system they use. *I really don't think I've seen a lock washer yet. *Most
of the stuff I see has plastic push fasteners. *I must be dense as a rock.
I thought they would use all sorts of fasteners depending on the
application. *Now to find out they use only a few. *Oh, dopey me.

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Well maybe you should look at what is used on aircraft instead making
assumptions. While there are mil-spec lock washers that were used on
some aircraft, they are never used in an area where safety could be
compromised by them coming loose. In safety critical areas, either
castle nuts and cotter pins are used or safety wire is used. Nylon
insert nuts are now the preferred choice in all instances where castle
nuts and/or safety wired is not required. My own feeling is that if
it is important enough to need a lock washer, it is important enough
to use a high quality nylon locking nut.

If however you are talking about holding pieces of plastic together
for cosmetic panels, you can use all the plastic push fastners you
want.

On another post you commented on the "single" use of the nylon insert
nuts and this may be correct if you are using the common cheap Home-
Depot made in China hardware. I have found that aircraft grade nylon
insert nuts will still provide a firm tight hold after two or three
cycles. I wouldn't recommend them for more than that though.