oil

Starrett 1620 oil is used as a mainstay product across many industries for lubricating precision threads and is readily available. I have a gallon of light turbine oil and also a partially full gallon can of Velocite #3 (ISO 2) spindle oil that I use for the plain bearing spindle in my B&S 2A surface grinder. Both seem to work just fine in micrometers and such over long periods. When I run out of them I might get the Starrett product... ;)
 
the starret instrument oil is what i use. on the bottle it just says that it is a highly refined mineral oil though, so i am sure a good clean mineral oil would work just fine as well

Growing up my Dad used the Starrett instrument oil on his fishing reels the main reason was because it is so highly refined it had less odor. So it good for more than micrometers


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