-388 BROWN FKM 90D O-RING

APG stocks the VB90388, an AS568-388 brown Viton® (FKM) 90 Shore A O-Ring built to an inside diameter of 18.953 in (481.41 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 19.373 in (492.07 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.

This material stands up to aggressive chemicals, petroleum oils and fuels, and aromatic hydrocarbons. That behavior comes from the compound itself: Viton® (FKM) is valued for the industry benchmark where nitrile reaches its thermal limit and outstanding high-temperature capability. Published continuous service range is -15°F (-26.1°C) to 400°F (204.4°C).

Maintenance and OEM teams specify it across semiconductor equipment, high-temperature process equipment, and oil and gas.

Stocked as VB90388 and sold individually. Review your operating media and conditions against this specification before installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.