-253 BLACK BUNA 90D O-RING

Part number H90253 is an AS568-253 black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 5.359 in (136.12 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.637 in (143.18 mm). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

Expect good resistance to propane and butane, hydraulic fluids, and many alcohols. Buna-N (Nitrile) delivers 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). Exposure to automotive brake fluid or ketones will shorten service life.

Maintenance and OEM teams specify it across construction equipment, automotive, and general industrial maintenance.

Order part number H90253, sold individually. Unit weight is approximately 5.62 g and nominal inside diameter is listed as 5 3/8 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.