“133‑038‑R” is a rotatable ConFlat (CF) flange variant sold by LDS Vacuum.
More specifically:
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It’s a 1.33″ OD (outer diameter) ConFlat flange, often referred to as “mini” CF or CF133 series.
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It has a 0.38″ inner bore (tube OD) (i.e. 3/8″)
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It is rotatable (i.e. the flange face can be rotated relative to the bolt holes) and has 6 clearance (through) bolt holes of diameter ~ 0.172″
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The body is a weldable blank (i.e. a bored blank) rather than having predrilled ports or threads beyond the bore
In short: it’s a weld-in, rotatable conflat flange to connect a 3/8″ tube to a UHV/CF interface.



