Lubricant for Brass on Stainless Steel Thread

How about powdered graphite, then?

Change the thread to acme and use oil impregnated bronze. These are standard components for the application you describe.

I worked In a machine shop many years ago where We used this exact application as You discribe. Had no problems.

oilcan13

Just about any NGLI 2 grease should fit the bill nicely.

It doesn't really sound like a good idea to go a number of years without re-lubrication, no matter what you use.

This type of arrangement will need frequent lubrication, forget about yeras. Further as operation is intermitant, thread flushing also needed for the startup after long break. Normal gear oil should be applied frequently during the operation may be through force feed lubricator or manually.

Loctite makes a whole range of anti-seize lubricants that work for your application. Check out Loctite's website and submit the details of the application to Loctite for their suggestion of which one is best for your usage. Loctite C5-A is the original and all types are very messy.

we used a copper slip in the beginning with good service, but switched over to aluminium lubrication spray recently due to cost and have not had any problems so far.

Their is a coating called Fluorolon 325 which is used extensively in the oil industry as a thread coating to solve problems in friction, corrosion, and galling. The coating typically applies 0.0005" - 0.001" thick per side and is comprised of PTFE and MOS2. The coating is an oven baked flluoropolymer coating and would require that you send the applicator doing this coating the parts to be coated. This along with any other grease or lubricants that you might use would make it a very slippery coating and should reduce your torque values considerably.

Hi All, thinks for your input. I'm new to the land of grease, so all of this has been very educational for me, and will keep me reading Wikipedia (and legitimate technical sources ) for quite some time.

Specifically thanks to Nick Name and Rorschach, I think I will look into a combination of your suggestions, NLGI 2 grade grease with MoS2.

This isn't a particularly heavy duty application, the screw will be heavily axially loaded very infrequently, and when it is the rotation rates will be extremely low to the point that heat buildup will be minimal. So some of the more permanent / exotic solutions would seem to be a bit overkill, but like I said, quite educational all the same.

Regards,

Tritium

If you have lots of money get the threaded stainless steel rod plasma nitrided. Both hardness and corrosion resistance of the surface are improved dramatically creating a low friction bearing surface which will last a long time with minimal maintenance although some lubrication should still be applied..