Compared to previous GIF, this shows process well, better lighting and color of material help too.
Not much oil is running, tells me these are pressure cast (or forged) aluminum fittings, not likely stainless steel.
Such raw parts are often chucked in a two jaw with formed cavities for sides and corner. One spigot is drilled to depth, thread OD turned, neck relief, seat of flare and the area past it to the thread a bit under minor diameter. Then re-chucked for other end and part is complete, less thread rolling, then anodizing. Those last two insure far longer service life than cut threads ever could, with anodizing to limit galling.
...we'll learn more by wandering than searching...
tooly (Oct 6, 2021)
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