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braxtron
Aug 23, 2007, 7:07 PM
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Registered: Apr 9, 2003
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Does anyone use a locking nut or washer on their bolts? If so which one(s)? If you're anti-locking nut/washer, why? I know Loc-tite is also a good option, but it's not what my ADD mind is curious about at the moment.
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sky7high
Aug 23, 2007, 7:21 PM
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Registered: Feb 15, 2006
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I have never seen locking nuts or washers, it's just much better to deform the threads in some way as to prevent unscrewing. For example, you can scratch the threads using a file or something hard.
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billcoe_
Aug 23, 2007, 7:28 PM
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Registered: Jun 30, 2002
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Yeah, I do sometimes. Works great. If it's a wedge anchor, use stainless steel anchors and stainless steel Esna nuts. I recommend type 316 stainless if you can get it (match the nut and anchor material, do not mix em).
First, crank the std nut down to the correct torque setting, take it off and put on an esna (Nylon Insert Locknut).
Works great, scratching the threads is a poor substitute at best IMO. If you want the hanger to stay on permanent like and be difficult to just steal, use something like Loctite red - #271 or 272 or Permabond 131.
http://www.amazon.com/...187897207&sr=1-4
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reg
Aug 23, 2007, 7:30 PM
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Registered: Nov 10, 2004
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when installed properly - the nut will try to pull the bolt out but it can't and a friction or tension will develope at the thread to thread contact point of nut and bolt. this coefficent of friction is what holds the nut in place - you probably know what i'm talkin about and others can explain it better - point is you don't need lockers or glue if the placement is right and the nut is cranked down. i suppose it wouldn't hurt.
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coastal_climber
Aug 23, 2007, 7:32 PM
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Registered: Nov 17, 2006
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I put a washer and a nut on the bolts at the crags. Some places put a tar on the nut(s) so they can tell if it's been tampered with.
>Cam
(This post was edited by coastal_climber on Aug 23, 2007, 7:34 PM)
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majid_sabet
Aug 23, 2007, 7:38 PM
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Registered: Dec 13, 2002
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The hanger itself serves as washer so you need no additional washer however, it is good to use a class III SST nut or self locking nut (Has a nylon ring near the top of the nut). Class III means, you can not turn the nut by hands that easily.
You also need to have minimum of 3 threads shown above the nut.
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dynosore
Aug 23, 2007, 8:15 PM
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Registered: Jul 29, 2004
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Mcmaster.com has SS nuts w/nylon inserts for locking. Seems like overkill, but it's your $$
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erick
Aug 24, 2007, 3:52 AM
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Registered: Aug 12, 2005
Posts: 191
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totally makes sense how the nut shouldn't be able to back off when it's well torqued, but gosh i can't even count how many hangers i've come across that are spinning loosely...
i've always wondered why the heck lock nuts aren't used. the extra precaution is worthwhile, i think.
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greenketch
Aug 24, 2007, 4:17 AM
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Registered: Jan 12, 2005
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Locknuts function by preventing the nut in relation to the material it rest against. In a bolted hanger use that is the hanger. As the hanger gets jerked around it forces the nut to turn and loosen. In almost every aplication I have seen lock washers tried the nuts loosen quicker. Lock tight works but is a pain to deal with. Deforming the threads is best.
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