حلقات O من HNBR | 0.139" CS X 4.484" ID | AS568-246 | داش 246 | صلابة 80 (14 / عبوة)

Needed a replacement for a high-temp seal on a steam valve, and these HNBR rings handled the 280°F service without any softening. The 80 durometer feels just right—firm enough to hold pressure but not brittle. Exact fit on the 4.484" groove, no issues at all.

Installed these on a hydraulic cylinder that sees continuous 250°F service, and the 80 durometer HNBR is holding up perfectly with no leaks after two weeks. The 4.484" ID fit exactly as needed on the groove.

The temperature range was the main reason I picked these, and so far they’ve held up fine in a hot oil application that’s been running near 280°F. The 80 durometer hardness gives them a solid, firm feel when installing, and the fit on the 4.484" bore was snug without any wrestling.