0.21" CS X 2.225" ID 氟橡膠FKM O型環 | AS568-331 | Dash 331 | X型環 | 硬度70 (8個/包)

The X-ring profile seated perfectly in my gland without any twisting, and the 0.21" cross-section feels beefy enough for high-pressure service. I've had these on a hot oil line running at 300°F for three weeks now, and they're holding up way better than the cheap Buna ones I used before.

The 70 durometer rating on these FKM o-rings gave me the confidence they'd hold up under high heat, and so far they haven't softened or deformed at all. I used them on a steam valve that cycles above 300°F, and the seal is still perfect after a month.

Installed these on a hydraulic fitting that sees constant 300°F heat; the Viton FKM material hasn't softened or cracked after a week of use, and the 70 durometer feels noticeably more robust than standard Buna-N seals.