{"product_id":"buna-n-90a-durometer-hydraulic-o-ring-4","title":"Buna-N 90A Durometer Hydraulic O-Ring","description":"\u003cp\u003eEngineered for demanding hydraulic applications, this Buna-N (NBR) O-ring features a 90 Shore A durometer hardness rating, delivering superior extrusion resistance and dimensional stability under high-pressure conditions. Ideal for use with petroleum-based hydraulic fluids, oils, and fuels, it maintains a reliable seal across a wide operating temperature range of -40°F to +250°F (-40°C to +121°C).\u003c\/p\u003e\u003cp\u003eThe elevated 90A hardness makes this O-ring the preferred choice over standard 70A compounds in high-pressure systems where back-up rings may not be practical, or where tighter clearance gaps demand a harder seal material. 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