These Replacement O-Rings follow International Standards Organization (ISO) standards and have a flange size of NW-100. 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. 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.

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-100 Centering Ring, 

ISO-LF Flange Size: NW-100

Common Dimensions: ID = 4.10" (104mm)