حلقات O من HNBR بقطر داخلي 6.475" × قطر مقطع 0.21" | AS568-357 | داش 357 | صلابة 80 (6 قطع/عبوة)

Needed these for a high-temp hydraulic repair on an older machine—the HNBR material handles the heat without softening up. Fit the groove perfectly with that 0.21" cross-section, and the 80 durometer gives them a nice firm seal. Worked great so far.

The 80-durometer hardness is perfect for my application—firm enough to hold pressure but still easy to seat in the groove. These handled a 250°F continuous heat cycle without any sign of hardening or cracking.

Used these to replace old seals on a hydraulic cylinder that sees heat cycling, and they've held up perfectly after dozens of cycles so far. The -40°F to +300°F range was exactly what I needed for the job.