-420 BROWN FKM 75D O-RING

The VB75420 is an AS568-420 brown Viton® (FKM) 75 Shore A O-Ring built to an inside diameter of 3.85 in (97.79 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 4.4 in (111.76 mm). This o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

The compound resists chlorinated solvents, aggressive chemicals, and aromatic hydrocarbons. That behavior comes from the compound itself: Viton® (FKM) is valued for long service life in hot, chemically aggressive environments and outstanding high-temperature capability. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Applications involving low-molecular-weight organic acids or ketones and esters call for a different compound.

Maintenance and OEM teams specify it across semiconductor equipment, chemical processing, and high-temperature process equipment.

Stocked as VB75420 and sold individually. Nominal inside diameter is listed as 3 7/8 inch. Check the compound against your process media, pressure and temperature before committing to a design. 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.