Non locking nuts on shear bolts? - Snowblower Forum : Snow Blower Forums
 
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post #1 of 6 Old 01-23-2017, 11:54 PM Thread Starter
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Non locking nuts on shear bolts?

My son does a lot of snowblower repair and asked me this. I didn't have an answer.
Quote:
"Why do so many shear pins (shear bolts) come with plain non-locking nuts?"
He always use a nylock he has on hand instead of the one that comes with the bolt. If someone is just picking up parts he checks the package to see what kind of nuts they are packaged with. He has replaced or sold hundreds of shearpins and said plain nuts are way more common than you would expect.
He knows they are only supposed to be tight enough that you can still spin the tightened fastener by hand, so he whats to know what keeps a plain nut from rattling loose and falling out. Stuff with clips or cotter pins or whatever...not an issue.
I had no clue but told him I'd ask my friends at SBF if they had any thoughts on this.
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post #2 of 6 Old 01-24-2017, 12:53 AM
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Its not regular nut, or its not a regular bolt. They do not spin on, I have to put mine on with a socket. Never had one loosen.
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post #3 of 6 Old 01-24-2017, 01:08 AM Thread Starter
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Ah. While it may look like a plain nut, it may have distorted threads or be slightly oval shaped.

Last edited by dbert; 01-24-2017 at 01:11 AM.
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post #4 of 6 Old 01-24-2017, 03:39 AM
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In my experience with shear pins like the one in the picture although at firts sight it looks like a regular nut, it is actually not. I've seen 3 cases. Where the nut is a bit oval shaped, where one end of the nut is slightly compressed in a few areas and like the ones in the picture where the nut is slightly compressed in the center. If you zoom the posted picture you can see that at least one of the nuts show a small dimple on one of the hex sides. On every single new shear pins that I've installed I've had to use wrenches due to the lock nuts.
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post #5 of 6 Old 01-24-2017, 04:25 AM
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Quote:
Originally Posted by hsblowersfan View Post
In my experience with shear pins like the one in the picture although at firts sight it looks like a regular nut, it is actually not. I've seen 3 cases. Where the nut is a bit oval shaped, where one end of the nut is slightly compressed in a few areas and like the ones in the picture where the nut is slightly compressed in the center. If you zoom the posted picture you can see that at least one of the nuts show a small dimple on one of the hex sides. On every single new shear pins that I've installed I've had to use wrenches due to the lock nuts.
Correct. Used this type for more than 20 yrs. Never had one come off . Even put the same nut back on sometimes after greasing the shaft. Never any problems.
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post #6 of 6 Old 01-24-2017, 06:29 AM
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Sometimes one of the sides of the nut will have a square/rectangle indentation, making it a friction locking nut.


-efisher-
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