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Thread lock or.................?

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Thread lock or.................?

Old 01-22-23, 04:11 PM
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Thread lock or.................?

I did a cursory search but didn't find an answer. I am cleaning up some v-brakes on a bike that has been stored outside for a while. I got the adjusting screws cleaned up decently with evaporust. While backing the screws out I noticed a white substance on the threads. I couldn't figure out if it is teflon paste or some sort of thread locker. I see that they used blue thread locker on the mounting bolts and all I have is blue. I do have teflon paste and anti-sieze. What do you recommend on these threads? Thanks!
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Old 01-22-23, 04:18 PM
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The substance sounds like corrosion. I would likely just use regular grease
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Old 01-22-23, 04:40 PM
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Normally screws stay tight through friction because they are under load.

Adjusting screws, like the limits on derailleurs, aren't under load, and need an other way to stay put. This might be a spring or a nylon coating that adds traction while still allowing movement.

You can buy "Vibra-tite" or improvise with rubber cement.
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Old 01-22-23, 04:48 PM
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One could always try a lube on reassembly and if the adjuster screws loosen clean them up and go to a light thread locker.

Most of the spring adjusting screws I have worked with have had no issues with changing their position and a large fraction of them have had no thread locker on them. The minor load the springs offer might be enough. (Now der limit adjusting screws are only loaded at the der's extremes of travel and often ride in a thread locking chunk of nylon). Andy
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Old 01-22-23, 06:43 PM
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Could be PTFE paste (aka Teflon). Usually deployed as thread sealant for fluid fittings, it also works well on things exactly like adjusting screws, where it provides a level of corrosion resistance, like anti-seize, and a little bit of thread holding. It sets up firm, but doesn’t “cure” like loctite.
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