حلقات O من HNBR بقطر داخلي 0.859 بوصة وقطر مقطع 0.139 بوصة | AS568-212 | داش 212 | صلابة 80 (70 / عبوة)

I’ve been using these in a hydraulic application at around 250°F, and they haven’t hardened or cracked like the previous Buna-N ones did. The -40°F to 300°F service range gives me confidence they’ll hold up through temperature swings. Good value for the 70-pack.

The 0.139" cross-section on these is noticeably firmer than standard Buna-N, which works perfectly for sealing high-temp compressor applications. I've had them in service for a couple of months now with zero leaks.

I’ve been using these HNBR o-rings in a high-temp application, and the 80 durometer feels perfect—not too stiff, not too soft. They hold up well at 300°F without any noticeable hardening after a few cycles. Definitely a solid upgrade from my old Buna-N ones.