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Hot Dipped Galvanized Locking Nut ?

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Forum topic by Joe posted 03-26-2020 06:39 PM 264 views 0 times favorited 11 replies Add to Favorites Watch
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Joe

14 posts in 1770 days


03-26-2020 06:39 PM

Friends,

If I should post in another forum, please advise but I need some advice on a bolting application for a safe connection.

In the attached photo, I’m looking to use a 1/2” locking nut. The problem is that these are not readily available for hot dipped galvanized bolts.

All stainless bolts and locking nuts is an option but then I’d have to replace everything at a higher cost than I’d like. The wood is western red cedar so hot dipped galvanized is the most economical but I’ve been unable to find a standard nylon insert nut but rather lots of “top lock nuts”. There is also the option of thread locker but this would need to have a special primer to bond correctly.

I’ve read that locking washers don’t work as well as once thought even though these are easy to source:
https://www.boltscience.com/pages/helicalspringwashers.htm

Anyone have advice or should I just go with a top lock nut or similar? This is for a swing set so I’d like to err on the safe side and not have a chance of these coming loose. For now, I’ve used toothed washers and have been keeping an eye on the nut tension but would like a more permanent solution.

Thanks!


11 replies so far

View Dark_Lightning's profile

Dark_Lightning

3934 posts in 3788 days


#1 posted 03-26-2020 08:01 PM

View Foghorn's profile

Foghorn

241 posts in 66 days


#2 posted 03-26-2020 09:33 PM

Plenty of thread there to double nut as well if you’re OK with the look of two nuts.

-- Darrel

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Dark_Lightning

3934 posts in 3788 days


#3 posted 03-26-2020 10:37 PM



Plenty of thread there to double nut as well if you re OK with the look of two nuts.

- Foghorn


Cheaper, too! Good recommendation.

-- Steven.......Random Orbital Nailer

View tvrgeek's profile

tvrgeek

621 posts in 2329 days


#4 posted 03-26-2020 11:59 PM

Double nut. Peen a thread. Lock washers, either splits or star never worked. Drill and cotter pin. Just hit the bold with a hammer and bend it.

View KYtoolsmith's profile

KYtoolsmith

134 posts in 540 days


#5 posted 03-27-2020 12:32 AM

Hot dipped fasteners are made with greater clearance between the male and female threads than the Grade 8 fastener referred in your link. This is to allow room for the molten zinc coating. Because the coating is uneven, the thread mating clearance must be quite loose. Therefore, a nyloc but would be destroyed against the rough zinc just by threading it onto the bolt. I doubt anyone makes a hot dipped nyloc nut ! A nyloc nut requires a higher quality closer fit thread class than what you are using. A galvanized fastener is slightly better than dipped, and zinc plating even better than that. Plated may be the best compromise between cost, durability and desire to use a nyloc nut. If you stay with hot dipped fasteners, double nutting or staking the nut by peaning the male thread with a center punch are your best options. Keep in mind, nyloc nuts loose their locking ability after initial use…
My $.02 The Kentucky Toolsmith!

-- "Good enough" is just another way of saying "it could be better"...

View ibewjon's profile

ibewjon

1381 posts in 3473 days


#6 posted 03-27-2020 01:00 AM

Menards and possibly HD carry hit dipped galvanized. Double nut and you should be fine. I have installed hundreds of street light, parking lot light, and traffic signal poles with single nuts, some with lockwashers, ( never had a lockwasher fail) some without, with no problems, so double nutting should cover you just fine. The only poles that fell were struck by a vehicle.

View Dark_Lightning's profile

Dark_Lightning

3934 posts in 3788 days


#7 posted 03-27-2020 01:41 AM


Menards and possibly HD carry hit dipped galvanized. Double nut and you should be fine. I have installed hundreds of street light, parking lot light, and traffic signal poles with single nuts, some with lockwashers, ( never had a lockwasher fail) some without, with no problems, so double nutting should cover you just fine. The only poles that fell were struck by a vehicle.

- ibewjon

Well, that was caused by the wrong kind of nut! The big one behind the steering wheel. :D

-- Steven.......Random Orbital Nailer

View Knockonit's profile

Knockonit

668 posts in 882 days


#8 posted 03-27-2020 01:45 AM

or you could stake them

rj in Az

-- Living the dream

View SMP's profile

SMP

1889 posts in 585 days


#9 posted 03-27-2020 04:40 AM

I use regular zinc coated stuff on red cedar all the time outside. Sure it only lasts 10 years or so but i find my wife usually wants stuff completely changed way before that. I usually paint it all or use the waterproof exterior stain over everything

View Joe's profile

Joe

14 posts in 1770 days


#10 posted 03-27-2020 09:08 AM

All - thanks for the great replies and suggestions. It sounds like double nutting / jam nut will be the safest and most cost effective.

In hindsight I suppose I could have used regular zinc plated since this swing set will only have another 5-8 years or so of life.

KYtoolsmith - I appreciate the detailed explanation. I realized the thickness on hot dipped galvanized is different but I didn’t think about the coating damaging the nylon. This must be why such a lock nut is impossible to find.

Knockonit - what’s “staking it” mean?

Menards and possibly HD carry hit dipped galvanized. Double nut and you should be fine. I have installed hundreds of street light, parking lot light, and traffic signal poles with single nuts, some with lockwashers, ( never had a lockwasher fail) some without, with no problems, so double nutting should cover you just fine. The only poles that fell were struck by a vehicle.

- ibewjon

Well, that was caused by the wrong kind of nut! The big one behind the steering wheel. :D

- Dark_Lightning

haha, good one!

View Joe's profile

Joe

14 posts in 1770 days


#11 posted 03-27-2020 01:40 PM

Update, I e-mailed these folks yesterday as a long shot and they offered to sell me a small batch of 1/2” hot dipped galvanized (13 thread) nylon lock nuts:

https://www.lok-mor.com/products/prevailing-torque/n-loc/

Minimum order was $25 so I ordered a few extra and am all set. It sounds like they sell them all the time so hopefully the nylon won’t have issues with the galvanized finish.

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