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Thread locker to keep un-torqued screw in place #4760465
05/17/18 09:46 PM
05/17/18 09:46 PM
Joined: Nov 2013
Posts: 1,975
Chicago, IL
EdwardC Offline OP
EdwardC  Offline OP
Joined: Nov 2013
Posts: 1,975
Chicago, IL
I have some machine screws that I need to screw into a metal structure (threaded). The machine screw needs to tighten down and hold another piece of metal, but I don't want it tight since I want the middle piece to be able to pivot and spin as needed. I feel that a nylon lock nut would be ideal for what I want (if the other side of the screw was accessible), but it's not.

So my question, is there a certain type of thread locking compound that would work best at keeping a machine screw locked in place while that screw isn't torqued at all? It's a fairly high vibration assembly, so I'm afraid that if I don't do anything, the screw will back out. I'd prefer it to be removable, so my first choice was to use a medium thread locker, or Vibra-tite VC-3, which I think both would be adequate, but I'm curious if there's a better product out there.

Thanks, I hope my description made sense!

Re: Thread locker to keep un-torqued screw in place [Re: EdwardC] #4760469
05/17/18 09:51 PM
05/17/18 09:51 PM
Joined: Sep 2004
Posts: 7,915
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,915
Marshfield , MA
Use a shoulder bolt and a ny-lok nut.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Thread locker to keep un-torqued screw in place [Re: EdwardC] #4760477
05/17/18 10:00 PM
05/17/18 10:00 PM
Joined: Nov 2013
Posts: 1,975
Chicago, IL
EdwardC Offline OP
EdwardC  Offline OP
Joined: Nov 2013
Posts: 1,975
Chicago, IL
Thanks, I hadn't thought about swapping out the fastener, a shoulder bolt of appropriate length isn't a bad idea at all. I don't have access to the other side (basically a tapped blind hole), so I can't use any kind of nut (or else I'd just throw a normal nut on as a jam nut).

With a shoulder bolt, I could properly torque it down. I might be wrong, but my assumption was that most common thread lockers relied on the fastener being properly torqued to work right.

Re: Thread locker to keep un-torqued screw in place [Re: EdwardC] #4760490
05/17/18 10:27 PM
05/17/18 10:27 PM
Joined: Nov 2004
Posts: 1,884
SD
zrxkawboy Online content
zrxkawboy  Online Content
Joined: Nov 2004
Posts: 1,884
SD
Vibra-tite sounds ideal for this situation.


"Think of all the Ford owners who will someday want an automobile." John Dodge

Re: Thread locker to keep un-torqued screw in place [Re: EdwardC] #4760564
05/18/18 04:33 AM
05/18/18 04:33 AM
Joined: Nov 2006
Posts: 20,787
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,787
MA, Mittelfranken.de
+1 on the shoulder bolt, a full threaded machine screw with loctite is the wrong fastener for this job. You can use thin nylon washers to take most of the play out and have smoother movement.


ASE L1, Master. Deutsch Meisterbrief.
Re: Thread locker to keep un-torqued screw in place [Re: EdwardC] #4760690
05/18/18 07:23 AM
05/18/18 07:23 AM
Joined: Sep 2015
Posts: 6,122
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,122
Kalifornia Kollective
+2 on shoulder bolt.

I use PVA wood glue on clean threads. Always comes loose when needed. Holds pretty well while in place. Poor mans Lock-Tite laugh



Last edited by BrocLuno; 05/18/18 07:23 AM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Thread locker to keep un-torqued screw in place [Re: EdwardC] #4760749
05/18/18 08:00 AM
05/18/18 08:00 AM
Joined: May 2013
Posts: 2,169
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,169
Saskatchewan, Canada
Multiple options:
-Those already suggested
-Stake the top of the bolt / fastener
-Use Nail Polish (=lacquer and pigment, but can be borrowed or buy a close-out bottle at the pharmacy for $1) over the top / side of the fastener / bolt threads
-Solder (permanent, essentially) with a heat gun instead of soldering iron providing the heat
-Epoxy (a small ball of putty epoxy would be perhaps ideal at just one point of the top of the fastener / thread interface, could just grind off that part of the threads to remove the fastener, the remaining threads would allow removal / re-assembly)

I'm sure there are other options.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: Thread locker to keep un-torqued screw in place [Re: EdwardC] #4760778
05/18/18 08:27 AM
05/18/18 08:27 AM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
polythene film from a bag of appropriate thickness.

(Poor man's Nylock)

Last edited by Ducked; 05/18/18 08:29 AM.
Re: Thread locker to keep un-torqued screw in place [Re: EdwardC] #4761192
05/18/18 03:23 PM
05/18/18 03:23 PM
Joined: Nov 2013
Posts: 1,975
Chicago, IL
EdwardC Offline OP
EdwardC  Offline OP
Joined: Nov 2013
Posts: 1,975
Chicago, IL
Thanks everyone! I have several of these to assemble, so I may try a few different methods you guys listed and see how it turns out. I think my first trial is to see if I can get the proper length shoulder bolt.

I actually really do like the idea of thin nylon washers, I want the part to be able to turn, but I don't want or need it to turn super freely, a little resistance would be perfect actually.

Thanks again!


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