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Posted by John2005 on July 24, 2008, 8:44 pm
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Hi everyone,
I'm hoping someone having experience with self locking nuts can help
me with the following.
At mcmaster.com I found four types of self locking nuts I can use on a
1/4-28 thread bolt. I just want to snug the nut down on the bolt to
take up any linear or axial play, but I'm not going to really torque
the nut down with any significant force. I could use loc-tite to keep
the nut from backing off but I want to try a self locking nut.
I have listed my choices from www.mcmaster.com below. I need to know
which nut will provide the most resistance to removal with a wrench.
There are no vibrations or anything in the application, I just need to
know which self locking method will provide the most resistance to
removal with a standard wrench. The nut will never be removed or
reused after it's snugged down.
If you could also list them in order of most resistance to least
resistance that would be great. If you are aware of any information or
online reference for actual forces required to loosen the nuts, that
would also be very helpful.
90566A210 (Nylon insert type Lock nut)
94830A515 (Expanding type lock nut)
91837A250 (Distorted thread type lock nut, top-lock style)
90040A120 (Distorted thread type lock nut, center-lock style)
I would appreciate any feedback or experiences with self locking nuts.
Thanks
John
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Posted by Bob AZ on July 25, 2008, 1:57 am
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> I would appreciate any feedback or experiences with self locking nuts.
>
> Thanks
> John
John
Even simpler. Get two jam nuts from your friendly hardware store and
jam them together. Maybe a washer between them if you like.
Bob AZ
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Posted by Stealth Pilot on July 25, 2008, 8:07 am
Please log in for more thread options On Thu, 24 Jul 2008 17:44:24 -0700 (PDT), John2005
>Hi everyone,
>
>I'm hoping someone having experience with self locking nuts can help
>me with the following.
>
>At mcmaster.com I found four types of self locking nuts I can use on a
>1/4-28 thread bolt. I just want to snug the nut down on the bolt to
>take up any linear or axial play, but I'm not going to really torque
>the nut down with any significant force. I could use loc-tite to keep
>the nut from backing off but I want to try a self locking nut.
>
>I have listed my choices from www.mcmaster.com below. I need to know
>which nut will provide the most resistance to removal with a wrench.
>There are no vibrations or anything in the application, I just need to
>know which self locking method will provide the most resistance to
>removal with a standard wrench. The nut will never be removed or
>reused after it's snugged down.
>
> If you could also list them in order of most resistance to least
>resistance that would be great. If you are aware of any information or
>online reference for actual forces required to loosen the nuts, that
>would also be very helpful.
>
>90566A210 (Nylon insert type Lock nut)
>94830A515 (Expanding type lock nut)
>91837A250 (Distorted thread type lock nut, top-lock style)
>90040A120 (Distorted thread type lock nut, center-lock style)
>
>I would appreciate any feedback or experiences with self locking nuts.
>
>Thanks
>John
in aviation we use the first and third types.
I find that the third type has a stronger hold than a nylock.
look up 'Nord-Lock' on google. this is a little double washer that
sits under the nut. it has stepped faces that make the release force
of the nut higher than the forced used to snug down the nut.
it may be a way of achieveing what you want. you could use plain nuts
or nylocks with them.
Stealth Pilot
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Posted by Bob AZ on July 25, 2008, 12:16 pm
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> in aviation we use the first and third types.
> I find that the third type has a stronger hold than a nylock.
> Stealth Pilot- Hide quoted text -
>
> - Show quoted text -
Speaking of aviation. Where does one find the nuts that can be "wire
nutted" to the bolt. A shop where I do work needs some.
Bob AZ
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Posted by John2005 on July 26, 2008, 2:02 am
Please log in for more thread options If I use a regular non hardened hex nut (maybe a grade 2 or a brass
nut) could I tap a hole through the side (through one of the nut flats
to the center of the nut) that would allow me to use a cone point set
screw to lock the nut in place after it's snugged down, or would
tapping the nut in this way mess up the nut threads so that it would
not thread onto the bolt ?
If it could work, tapping the nut would be easy and set screws are
cheap. Plus I would save time cleaning the bolts, applying primer, and
waiting for the loc-tite to dry.
Once the cone point set screw digs in, I don't think it would go
anywhere. It's just a matter of whether it can be done without messing
up the nut threads.
Do you think it would likely work ?
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>
> Thanks
> John