-263 BLACK BUNA 90D O-RING

The H90263 is an AS568-263 black Buna-N (Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 7.234 in (183.74 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 7.512 in (190.8 mm). This o-ring compresses into its gland to block fluid or gas migration across a joint.

It resists propane and butane, petroleum-based oils, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or automotive brake fluid call for a different compound.

Typical settings include agricultural equipment, construction equipment, and hydraulic and pneumatic systems.

Stocked as H90263 and sold individually. Unit weight is approximately 7.673 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.