The ISO-LF (KF) Blank Flange is an ISO standard-sized flange that attaches onto other components in the ISO family.

Blank flanges are manufactured with no weld prep and no tubing bore and typically come in 304 stainless steel or 6061 Aluminum.

They are commonly used to close unused ports or they are altered by customers with their own custom machining capability for a special use.

ISO Blank flanges connect using clamps and withstand a vacuum environment of 1×10-8 Torr (High Vacuum) and they are bakeable up to 392°F.