-437 BLACK BUNA 90D O-RING

Ordered as H90437, this is an AS568-437 black Buna-N (Nitrile) 90 Shore A O-Ring measuring an inside diameter of 5.975 in (151.77 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.525 in (165.74 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies.

As a material, Buna-N (Nitrile) is widely chosen for an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. This material stands up to water, greases and lubricants, and hydraulic fluids. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).

Maintenance and OEM teams specify it across agricultural equipment, hydraulic and pneumatic systems, and fluid power.

H90437 ships individually. Unit weight is approximately 26.726 g and nominal inside diameter is listed as 6 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.