540001, 12-Pt, Box Wrench, 0.25" x 0.3125" (1 Per Pack)

Part Number / SKU
Availability: In Stock
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MDC 304 stainless steel bell jars are designed for use with MDC flat baseplates, base wells and feedthrough collars. A dovetail groove in the jar’s base flange holds a Fluorocarbon-based fluoroelastomer (FKM / FPM) elastomer o-ring gasket, which makes the vacuum seal with a baseplate or one of the  components previously listed. All stainless steel bell jars are fitted with a four-inch view diameter PVP-4 Pyrex® viewport. All vacuum welds are internal and provide UHV compatibility. For added convenience, all bell jars are fitted with a hoist or single top-center lift-ring that is welded to the chamber’s domed top. These chambers can be purchased with an optional electropolished finish.


  • Fluorocarbon-based fluoroelastomer (FKM / FPM) Gasket Seal
  • Pyrex® Viewport PVP-4



Gasket, elastomer         Fluorocarbon-based fluoroelastomer (FKM / FPM)


Gasket, elastomer          O-Ring

Method                            Gravity

Vacuum Range              1x10-6Torr

Temperature Range      Ambient to 150°C

Nominal Size                  12.00

Internal Diameter         12.00

Flange O.D.                      14.00

Height W/O O-Ring        12.00

Viewport Height              6.00

Weight (Pounds)            65.00

More Information


Weight (lb) 0.25
Flange Type ISO LF Large-Flange
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