Vacuum flange
（重定向自Vacuum fittings）
![A KF-25 tee, o-ring, and clamp](/Images/godic/202502/19/KF_25_Tee2944.jpg")
![A 2¾ CF (conflat) full nipple with blank flange and OFHC gasket](/Images/godic/202502/19/Conflat_Flange2944.jpg")
![A 60 kV high-voltage electrical feedthrough on a 4½ inch (or DN63) conflat flange](/Images/godic/202502/19/60kV_Feedthrough2944.jpg")
A vacuum flange is a flange at the end of a tube used to connect vacuum chambers, tubing and vacuum pumps to each other. Vacuum flanges are used for scientific and industrial applications to allow various pieces of equipment to interact via physical connections and for vacuum maintenance, monitoring, and manipulation from outside a vacuum's chamber. Several flange standards exist with differences in ultimate attainable pressure, size, and ease of attachment.