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Tractor Talk Discussion Forum

stop vs lock nut

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FarmerDave

08-04-2004 18:17:05




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Our bestess feed store has two nuts. The one with the plastic insert they call a stop nut. The one with deformed thread near the end of the nut they call a lock nut. The stop nuts are much cheaper. Do they have different applications or is the plastic one just for the thrifty in a throw away society?




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Mac

08-05-2004 02:32:20




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 Re: stop vs lock nut in reply to FarmerDave, 08-04-2004 18:17:05  
I re-use nylocs with loctite 242(blue )no problems. You can tell when insert is worn out. I guess if I'm that concerned with nut loosening, I drag out the torque wrench. Like somebody said, wouldn't use them on exhaust etc. There are also re-usable castlelated lock nuts that you can sqeeze in vice if they get too easy. They're a little spendy though.



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TimFL

08-04-2004 20:08:57




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 Re: stop vs lock nut in reply to FarmerDave, 08-04-2004 18:17:05  
I agree with Tom. The only other consideration is the operating environment. Nylon will not hold up in hot applications like in an engine compartment. I consider either one single use for the most part as nylon conforms to the thread and the "deformed" type ususlly end up wiping out the thread. The use of either mainly depends on application. May be better to try liquid thread lock.



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big fred

08-04-2004 20:07:50




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 Re: stop vs lock nut in reply to FarmerDave, 08-04-2004 18:17:05  
The deformed thread locknut can be used in high temperature applications where a stopnut can't be used. We use both, at least in smaller sizes, in commercial and military aircraft design, and I've seen both survive full military vibration qualification tests, which are the equivalent of a 15 to 30 year service life.



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VaTom

08-04-2004 20:02:36




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 Re: stop vs lock nut in reply to FarmerDave, 08-04-2004 18:17:05  
Dave,

Large difference in application. The deformed steel nut will hold when pretty much nothing else will. I have dozens of them on my non-standard truck. Plastic or nylon inserts are light duty applications. Both are intended for single use.



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TomTX

08-04-2004 18:38:21




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 Re: stop vs lock nut in reply to FarmerDave, 08-04-2004 18:17:05  
Dave, I call them both "lock nuts" and I usually prefer the one with plastic insert because I have found that the deformed steel kind do lots of damage to the threads. The plastic insert kind seem to hold good for me and do not distort the threads on the bolt. I have been told that lock nuts are only designed for one-time use, like lock washers; but like most people, I sometimes re-use them if they seem to be OK.

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