-128 BLACK BUNA 70D O-RING

Part number H70128 is an AS568-128 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 1.487 in (37.77 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.693 in (43 mm). An o-ring remains the most cost-effective sealing element available for pressurized assemblies.

It resists hydraulic fluids, petroleum-based oils, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with polar solvents or ketones.

It sees regular use in agricultural equipment, hydraulic and pneumatic systems, and general industrial maintenance.

Order part number H70128, sold individually. Unit weight is approximately 0.86 g and nominal inside diameter is listed as 1 1/2 inch. Review your operating media and conditions against this specification before installation.