-309 BLACK BUNA 90D O-RING

APG stocks the H90309, an AS568-309 black Buna-N (Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 0.412 in (10.46 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 0.832 in (21.13 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.

It resists water, many alcohols, and hydraulic fluids. Buna-N (Nitrile) delivers low compression set under sustained load, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It should not be specified for service in automotive brake fluid or strong acids.

Typical settings include general industrial maintenance, construction equipment, and hydraulic and pneumatic systems.

Order part number H90309, sold individually. Unit weight is approximately 1.4958 g and nominal inside diameter is listed as 7/16 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.