Centering Ring O-Ring Replacement, BUNA, ISO-320 Vacuum Fitting, ISO MF LF Flange Size NW-320
These BUNA Replacement O-Rings follow International Standards Organization (ISO) standards and have a flange size of NW-320. 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 BUNA. Description: Standard Nitrile is also known as Buna-N. Excellent resistance to petroleum-based oils and fuels, water and alcohols. Nitrile also has good resistance to acids and bases, except those with a strong oxidizing effect.
Limitations: Avoid highly polar solvents (Acetone, MEK, etc.) and direct exposure to ozone and sunlight.
Temperature Range: �55� to 120�C (�65� to 248�F)
O-Ring, BUNA for NW-320 Centering Ring,
ISO-LF Flange Size: NW-320
Common Dimensions: ID = 12.95" (329mm)