Our online catalog is being updated! Please contact us for current pricing. Bell Jar Feedthrough Collars Our feedthrough collars are designed for inclusion between the bell jar and the baseplate of the vacuum system. Feedthrough collar ports accept equipment that is mounted on a mounting flange, i.e., electron beam guns, residual gas analyzers, gauges, valves, feedthroughs, etc. Ports not in use are blanked off with blank flanges. Lightweight Stainless Steel Collars (Lighter than many aluminum collars) Options Available Custom feedthrough collars are available in the standard collar sizes to fit customer specifications. Choices of special specifications include varying the port tubulation length or having a specially machined O-ring gasket groove. An option of ConFlat® flange sealing of ports is available upon request. Specifications    • 10-9 to 10-11 Torr    • Bakeable to 200°C    • O-ring grooved    • Special sizes available Collar Dimensions   Model No. Specifications FC-1200 FC-1800 Nom. diameter 12”/305 mm 18”/457 mm Dimension A 14”/356 mm 20”/508 mm Dimension B 11.75”/298 mm 17.25”/438 mm Dimension C 12.5”/318 mm 18.5”/470 mm Material Stainless steel, type 304 Top seal Flat flange mates with standard glass bell jar seal Bottom seal Standard L-shaped bell jar gasket Test specification No detectable leaks with mass spectrometer leak detector sensitivity of 1 x 10-10 std. cc/sec Shipping wt. 85 lbs/39 kg 125 lbs/57 kg Collar price $3,200 $3,800 Viton®L gasket $75 $140