568-121 FLUOROSILICONE 70 DURO ORINGS

The FS70121 is an AS568-121 blue Fluorosilicone (FVMQ) 70 Shore A O-Ring supplied with an inside diameter of 1.049 in (26.64 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.255 in (31.88 mm). This o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Fluorosilicone (FVMQ) is widely chosen for silicone's low-temperature flexibility combined with fuel resistance, excellent ozone and UV stability. The material holds up against extreme cold, petroleum oils, and aromatic fuels and jet fuel. The material carries a published service range of -80°F (-62.2°C) to 350°F (176.7°C). It is not the right choice where high-temperature dynamic service or hydrazine are present.

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

This item is sold individually under part number FS70121. Unit weight is approximately 0.7425 g and nominal inside diameter is listed as 1 1/16 inch. Application requirements vary, so validate compatibility with your process conditions prior to 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.