Those incorrect statements are a byproduct of which lubricants you purchase and which system is commonly used for specific markets. The truth is that ISO and SAE are very much the same thing as saying a 12 mm bolt or a 1/2 inch bolt. Different measuring systems, nothing else. Still bolts. It helps a lot to have the charts ingrained in your mind, or a chart handy:SAE oils are for automotive use.
ISO oils are for industrial aplications.
Sometimes we can do a crossover, but it isn't ideal.
Convention. "We have been doing it this way for more than a century. It was good enough for grandpa, good enough for dad, and good enough for me. Why fix something that ain't broken?" The other side of the coin is "Why remain a island with old technology that does not mesh with the rest of the world? It costs us lots of potential income and extra effort to make things that the rest of the world does not want. Why keep pushing back against the inevitable?" There is a sort of middle ground that says that when using computers and CNC equipment it really doesn't matter very much. The machines can make Whitworth threads just about as easily as ISO threads, and tooling needs do not change much. For hobby machinists, we can make anything we damn well please! We are still prisoners to what is available for our materials and consumables.Bob, Do you have any idea why in the USA most lubricants are marketed using SAE except for hydraulic oils which use ISO (at least that is what I see most often)? Is that just another American bastardization?
I think that would make it worse. You need a good seal between the tip and the body of the oiler so that the oil can unseat the ball.I READ SOMEWHERE LONG AGO, THAT THOSE CONICAL TIPS ON THE OIL CANS SHOWN ARE THE THING TO USE, BUT THAT THE BALL TENDS TO SEAL OFF THE HOLE THAT DELIVERS THE OIL AND THAT CAN BE SOLVED BY FILING A SHALLOW VEE WITH A TRIANGULAR FILE ACROSS THE TIP, TO ALLOW OIL TO FLOW MORE EASILYPAST THE BALL. I HAVE NEVER TRIED IT, AND PERSONALLY DETEST BALL OILERS FOR THE MOST PART, AND WOULD REPLACE THEM WITH GITS STYLE HINGED TOP OILERS.