-138 BLACK BUNA 50D O-RING

This o-ring is supplied in AS568-138 black Buna-N (Nitrile) 50 Shore A built to an inside diameter of 2.112 in (53.64 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.318 in (58.88 mm), catalogued under part number H50138. It creates a positive seal at flange, piston and rod interfaces without added hardware.

This material stands up to petroleum-based oils, propane and butane, and many alcohols. Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with polar solvents or ketones.

You will find this material specified across automotive, fluid power, and general industrial maintenance.

H50138 ships individually. Nominal inside diameter is listed as 2 1/8 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.