Centering Ring O-Ring Replacement, Viton®, ISO-250 Vacuum Fitting, ISO MF LF Flange Size NW-250

These Viton® Replacement O-Rings follow International Standards Organization (ISO) standards and have a flange size of NW-250. ISO flanged vacuum fittings are commonly used to build process vacuum plumbing and systems for industrial applications. The fittings are quick to assemble using double claw clamps and a centering ring (please see top right figure - click to enlarge). The ISO standard sizes for LF NW ISO large flanges are NW-63, NW-80, NW-100, NW-160, NW-200, NW-250, NW-320, NW-400, NW-500, NW-630.

They are made of Viton® which is well known for its excellent resistance to heat (400°F/200°C) and to aggressive fuels and chemicals. Viton® is a registered trademark of DuPont Performance Elastomers.

O-Ring, Viton for NW-250 Centering Ring,
ISO-LF Flange Size: NW-250
Common Dimensions: ID = 9.96" (253mm)