حلقات O من HNBR | 0.21" CS X 6.225" ID | AS568-356 | داش 356 | صلابة 80 (6/عبوة)

I was a bit worried about high-temp sealing in my hydraulic system, but these HNBR o-rings handle the 300°F rating perfectly. The 80 durometer feels firm enough to hold a solid seal without being impossible to install.

The -40°F low-temp rating is what sold me, and after a winter of outdoor use these seals haven’t hardened or cracked at all. The 0.21" cross-section feels robust, and the six-pack was exactly what I needed for a full rebuild.

I’ve had these in the freezer at -30°F for a few weeks now and they still seal perfectly after several cycles, which is exactly what I needed for a cold-line repair. The 80 durometer density makes them feel plenty sturdy without being a struggle to snap into the groove.