4.5MM CS X 56MM ID BLACK FKM 75D

Part number V4.5X56 is a black Viton® (FKM) 75 Shore A O-Ring with an inside diameter of 56 mm (2.205 in), a cross section of 4.5 mm (0.177 in), and an outside diameter of 65 mm (2.56 in). An o-ring delivers dependable bidirectional sealing in a compact groove envelope.

The material holds up against petroleum oils and fuels, chlorinated solvents, and many acids. That behavior comes from the compound itself: Viton® (FKM) is valued for long service life in hot, chemically aggressive environments and the industry benchmark where nitrile reaches its thermal limit. Published continuous service range is -15°F (-26.1°C) to 400°F (204.4°C). It is not the right choice where ketones and esters or low-molecular-weight organic acids are present.

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

This item is sold individually under part number V4.5X56. Unit weight is approximately 5.5623 g. 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.