Usually Nyogel 760G, sometimes Superlube or silicone grease.
XTAR flashlight grease is cheap on aliexpress and I’m very satisfied with its quality.
Nyogel 760g,
it is a thin Silicone lube, not too thick and sticky.
> I am using some silicone grease on my lights, but I don’t like it a lot. The threads are not smooth enough with this.
Silicone comes in different thicknesses… I hope you find one you like… there is commonly available silicone at auto supply stores…
fwiw, colored O rings are not necessarily silicone, many are Nitrile and have no problem with silicone lube, just like the black ones.
I used to use Nano Oil, but recently adopted Nyogel 760g from Oveready. Im very happy with it, and like it better, for threads and O rings.
Oveready uses Nyogel 760g on all their lights including the Titanium lights, and Im finding it works very well on my Titanium lights too.
Ive used Superlube for a few years now and like it a lot. A $9 tube will last forever and I use it on other stuff as well. Non toxic synthetic and dielectric as well and won’t cause nitrile or silicone orings to swell or break down like petroleum grease.
silicone is synthetic, it is not a petroleum product
and it does not harm Nitrile O rings
superlube has products that do not contain silicone and are not compatible with nitrile O rings, shown is this chart,
Some Superlube products use silicone, and those Are compatible w Nitrile O rings.
I tried some superlube (not sure exactly which, it was a sample from a friend), it was a white tacky substance, and it was too sticky for my threads and O rings. I removed the Superlube. I prefer Nyogel 760g
Here is a Superlube product specifically for O rings, it is a Silicone product… I have not tried it, but I dont doubt it could work. Silicone is good stuff…
……beeswax.
Well I can’t see this NOT working. Does it Impart any extra impedance compared to other greases?
Usually this stuff unless it’s hot outside.
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Oh, you meant for lights. Nano Oil
Only downside is you get chased around by bees wanting their wax back.
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I have a tube of Dow Corning 111 Valve Lubricant & Sealant and have been using it for o-ring lube for at least 30 years. It has been fine on my flashlights, but I recently tried Super Lube and it also works well.
Astroglide.
Oh, wait.
Flashlights, not fleshlights. 
Since it’s on anodized threads, I hadn’t noticed a difference. Usually wipe electrical contact points clean regularly… Yet, worth testing, as it unavoidably does move around a bit.
Another chance to win flashaholic converts. Have you heard the good news, bees?
KPL ultralite—-on Amazon.
Same. Bought big pack, my grandchildren will use it too probably.
Moly grease is usually thick, and not necessarily intended for things that need to have a low coefficient of friction like an auto knife. It is intended for extreme pressure applications like motorcycle/ automotive suspension parts or wheel bearings. I would be hesitant to use it on a knife or gun since it can get cold in my area and its use in low temp applications will cause it to become too stiff to operate properly. The other reason not to, is because of the fact that it is gray in color and very much like the plague- hard to not spread around and get on everything.
A good gun grease would be your better bet.
The lube that’s in a 10,000 lumen flashlight, turned on, is pretty hot. Not hot enough to get you excited, though.
Really, has there been any significant progress over the last decade? I have a feeling that the cheepest lube from China that is compatible with your o-ring chemistry is not notably worse than those super lubes….
Apparently there has been no progress over the last decade.
I just redid my new lights with the lube i already have.
Nyogel 760G is not ideal as an o-ring lubricant. I’ve found that it separates and thickens, assuming the stuff I bought is genuine. I have doubts about the gun and knife oil being promoted here as well. Some of those might be incompatible with Nitrile / Buna-N o-rings.
The people that make the KPL (knife pivot lube) do not recommend it for use on flashlight threads because it may cause the rubber o rings to swell; I use it anyway on my Lumintop AA and AAA with no problems. These lights are outside in Florida 24/7.
Wlll update as time goes on.
Bats are changed every 2 days as they are in 5 lanterns.
This stuff does make them threads smoothern a spanked baby’s ace on the 4th of July with the sun a shinin’.