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nuts with nylon inserts versus lock washers and jamb nuts

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nuts with nylon inserts versus lock washers and jamb nuts mm 05-01-2008
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Posted by Jeff on May 2, 2008, 11:09 am
Nylon lock nuts came from the aircraft industry to solve the problem of nuts
loosening due to prop engine vibrations. Always used them when I made model
airplanes. Painting the threads after the nut is tight with finger nail
polish is a good idea as a backup as well or use a product such as locktite.

>I bought one of those little kit trailers, what you can get for about
> 350 dollars, with a 4x8' bed, for a one time use, and some little uses
> aftewrads. From Harbor Freight that carries 990 pounds they say. I
> only need to carry less than 100.
>
> Assembling it today, I noticed that they depend on nuts with nylon
> inserts to keep the nuts from coming all the way off. They depend on
> tightening them tighlly to keep them from coming loose.
>
> Is that enough or should I put split ring lock washers under each nut.
>
> Or would it be better, just as good, to put jamb nuts on the bolts
> that are long enough.
>
> IIRC the instructions say in one place to check that the nuts are
> tight after 100 miles, which seems like a good idea, but in another
> place I think it said every 100 miles!!!!!
>
> Thanks



Posted by SteveB on May 2, 2008, 2:06 pm
>>I bought one of those little kit trailers, what you can get for about
>> 350 dollars, with a 4x8' bed, for a one time use, and some little uses
>> aftewrads. From Harbor Freight that carries 990 pounds they say. I
>> only need to carry less than 100.
>>
>> Assembling it today, I noticed that they depend on nuts with nylon
>> inserts to keep the nuts from coming all the way off. They depend on
>> tightening them tighlly to keep them from coming loose.
>>
>> Is that enough or should I put split ring lock washers under each nut.
>>
>> Or would it be better, just as good, to put jamb nuts on the bolts
>> that are long enough.
>>
>> IIRC the instructions say in one place to check that the nuts are
>> tight after 100 miles, which seems like a good idea, but in another
>> place I think it said every 100 miles!!!!!
>>
>> Thanks

My experience with Nylocks is this:

They are good for some applications. They are not good for others. They
are a one time use thing, as once they are run on and off one time, the
holding power is diminished a lot. I know they make them in all sizes up to
double jumbo, but for something I really want to know is going to stay put,
I'd prefer personally to use lock washers or even double nutting with a jam
nut. I have yet to have a jammed jam nut come loose. OTOH, like you, I
have had new Nylocks loosen up soon after installation. IIRC, there is a
nut called a castle nut that has a small crimp in it, and fits tight tight
tight on installation and is dependable not to work loose, and if it does
not loosen, it won't just vibrate off once it gets just so loose. The
crimps keeps a grip on the bolt, and cannot be taken off without a wrench.

Just my two pennies, your mileage may and probably does vary.

Steve



Posted by Pete C. on May 2, 2008, 12:32 pm

SteveB wrote:
>
> >>I bought one of those little kit trailers, what you can get for about
> >> 350 dollars, with a 4x8' bed, for a one time use, and some little uses
> >> aftewrads. From Harbor Freight that carries 990 pounds they say. I
> >> only need to carry less than 100.
> >>
> >> Assembling it today, I noticed that they depend on nuts with nylon
> >> inserts to keep the nuts from coming all the way off. They depend on
> >> tightening them tighlly to keep them from coming loose.
> >>
> >> Is that enough or should I put split ring lock washers under each nut.
> >>
> >> Or would it be better, just as good, to put jamb nuts on the bolts
> >> that are long enough.
> >>
> >> IIRC the instructions say in one place to check that the nuts are
> >> tight after 100 miles, which seems like a good idea, but in another
> >> place I think it said every 100 miles!!!!!
> >>
> >> Thanks
>
> My experience with Nylocks is this:
>
> They are good for some applications. They are not good for others. They
> are a one time use thing, as once they are run on and off one time, the
> holding power is diminished a lot. I know they make them in all sizes up to
> double jumbo, but for something I really want to know is going to stay put,
> I'd prefer personally to use lock washers or even double nutting with a jam
> nut. I have yet to have a jammed jam nut come loose. OTOH, like you, I
> have had new Nylocks loosen up soon after installation. IIRC, there is a
> nut called a castle nut that has a small crimp in it, and fits tight tight
> tight on installation and is dependable not to work loose, and if it does
> not loosen, it won't just vibrate off once it gets just so loose. The
> crimps keeps a grip on the bolt, and cannot be taken off without a wrench.
>
> Just my two pennies, your mileage may and probably does vary.
>
> Steve

Castle nuts have notches in them and are used with cotter pins. You're
thinking of an interference nut which is deformed by several crimps and
produces a tight fit. These don't work any better or worse than the
nylocks, both will have reduced friction with repeated
installation-removal cycles, and both resist continued loosening if they
do come loose since they have friction. Conventional nuts and
lockwashers have no friction once they loosen past the point of
compressing the lockwasher and will continue to loosen until they fall
off. For positive locking use the castle nuts and cotter pins.

Posted by Pete C. on May 2, 2008, 11:13 am

mm wrote:
>
> I bought one of those little kit trailers, what you can get for about
> 350 dollars, with a 4x8' bed, for a one time use, and some little uses
> aftewrads. From Harbor Freight that carries 990 pounds they say. I
> only need to carry less than 100.
>
> Assembling it today, I noticed that they depend on nuts with nylon
> inserts to keep the nuts from coming all the way off. They depend on
> tightening them tighlly to keep them from coming loose.
>
> Is that enough or should I put split ring lock washers under each nut.
>
> Or would it be better, just as good, to put jamb nuts on the bolts
> that are long enough.
>
> IIRC the instructions say in one place to check that the nuts are
> tight after 100 miles, which seems like a good idea, but in another
> place I think it said every 100 miles!!!!!
>
> Thanks

The key difference between the nylock nuts and a conventional nut with a
lockwasher is that while either one may work loose from the tight state,
after that point, the nylock will stay put on the bolt, while the
conventional nut and lockwasher have no retention after the compression
of the lockwasher is lost and will continue to turn with vibration until
the nut completely falls off.

Posted by DerbyDad03 on May 2, 2008, 2:12 pm
> mm wrote:
>
> > I bought one of those little kit trailers, what you can get for about
> > 350 dollars, with a 4x8' bed, for a one time use, and some little uses
> > aftewrads. =A0From Harbor Freight that carries 990 pounds they say. =A0I=

> > only need to carry less than 100.
>
> > Assembling it today, I noticed that they depend on nuts with nylon
> > inserts to keep the nuts from coming all the way off. They depend on
> > tightening them tighlly to keep them from coming loose.
>
> > Is that enough or should I put split ring lock washers under each nut.
>
> > Or would it be better, just as good, to put jamb nuts on the bolts
> > that are long enough.
>
> > IIRC the instructions say in one place to check that the nuts are
> > tight after 100 miles, which seems like a good idea, but in another
> > place I think it said every 100 miles!!!!!
>
> > Thanks
>
> The key difference between the nylock nuts and a conventional nut with a
> lockwasher is that while either one may work loose from the tight state,
> after that point, the nylock will stay put on the bolt, while the
> conventional nut and lockwasher have no retention after the compression
> of the lockwasher is lost and will continue to turn with vibration until
> the nut completely falls off.- Hide quoted text -
>
> - Show quoted text -

Another key application for nylock nuts is that they can be left
slightly loose for those instances where you want to allow for
movement such as at pivot points. You can obtain a snug fit so things
aren't flopping around, but you can still move the parts.

All steering assemblies and some brake assemblies on official All
American Soap Box Derby cars use nylock nuts for this very purpose. In
fact, by rule, the steering assemblies require *two* nylock nuts on
the same bolt. Talk about overkill!




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