Specializing in standard, custom, and modified Glass to Metal seals.

ISO Large Flanges

Large-Flange® ISO vacuum flanges are an economical system of reusable interfacing stainless steel vacuum fittings for larger sizes of tubing from 2-1/2 thru 20 inch. Vacuum seal is by compression of an o-ring between two like flanges which can be either Claw-Clamp or Bolt type. Standard components in this catalog are supplied mounted on Claw-Clamp flanges. These can be mated to bolt flanges with a Rotatable Bolt Ring assembly.

Assemblies are bakeable to 200°C intermittent and 150°C sustained. Operating pressure is 30psig positive. Viton® o-rings may require periodic replacement.


  • ISO Compatible
  • Type 304 stainless steel flanges
  • All metal Aluminum Claw-Clamps
  • Viton® o-rings bakeable to 200°C; sustained use at 150°C
  • Compatible with Bolt-Style flanges when using Rotatable Bolt Ring

Request a quote on Large-Flange® ISO vacuum flanges for your application, or contact Larson Electronic Glass for more information.

Larson Electronic Glass offers "Large-Flange" hardware available for flanges from NW63 to NW200

 *Please select the quantity for each item you wish to order and click the 'Add To Quote' button below.
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NW80 3" Bored Bolt Flange  NW80 3" Bored Bolt Flange  913408  100

NW80 3" Bored Claw Clamp  NW80 3" Bored Claw Clamp  913208  75

NW80 Blank Bolt Flange  NW80 Blank Bolt Flange  913308  110

NW80 Blank Claw Clamp  NW80 Blank Claw Clamp  913108  80

NW80 Rotatable Bolt Ring  NW80 Rotatable Bolt Ring  913508  100

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