This o-ring is supplied in AS568-251 black Viton® (FKM) 90 Shore A supplied with an inside diameter of 5.109 in (129.77 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.387 in (136.83 mm), catalogued under part number V90251. It compresses into its gland to block fluid or gas migration across a joint.
Viton® (FKM) is specified here for industry benchmark where nitrile reaches its thermal limit and outstanding high-temperature capability. This material stands up to chlorinated solvents, aromatic hydrocarbons, and aggressive chemicals. Published continuous service range is -15°F (-26.1°C) to 400°F (204.4°C). It should not be specified for service in amines or ketones and esters.
It sees regular use in semiconductor equipment, aerospace, and chemical processing.
V90251 ships individually. Unit weight is approximately 7.426 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.
Description -251 BLACK FKM 90D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 5.109 inch (129.77 mm)
Actual Outside Diameter 5.387 inch (136.83 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity