*568-389 FLUOROSILICONE 70 DURO ORINGS

Part number FS70389 is an AS568-389 blue Fluorosilicone (FVMQ) 70 Shore A O-Ring measuring an inside diameter of 19.953 in (506.81 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 20.373 in (517.47 mm). An o-ring remains the most cost-effective sealing element available for pressurized assemblies.

The material holds up against petroleum oils, ozone and weathering, and extreme cold. Fluorosilicone (FVMQ) is widely chosen for excellent ozone and UV stability, silicone's low-temperature flexibility combined with fuel resistance. Rated temperature range runs from -80°F (-62.2°C) to 350°F (176.7°C) in continuous service. Exposure to ketones or high-temperature dynamic service will shorten service life.

You will find this material specified across military ground vehicles, high-altitude equipment, and aviation fuel systems.

Stocked as FS70389 and sold individually. Nominal inside diameter is listed as 20 inch. Review your operating media and conditions against this specification before installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.