حلقات O من HNBR قطر داخلي 3.725 بوصة × مقطع عرضي 0.21 بوصة | AS568-343 | داش 343 | صلابة 90 (8 / عبوة)

These fit perfectly on my hydraulic cylinder and the 90-durometer feels noticeably more rigid than the standard 70 I was using before. Held up great after a day at 250°F with no visible degradation.

The 90-durometer hardness on these is no joke—they’re stiff right out of the bag, which is exactly what I needed for a high-pressure seal. They fit the groove perfectly and haven’t budged even with the temp swings between 40°F and 140°F in my setup. Shipping was quick, and the pack of eight felt lik

I needed an exact 3.725" inner diameter for a hydraulic repair and these HNBR o-rings fit perfectly, with the 90 durometer providing just the right amount of firmness. The -40°F to +300°F service range gives me confidence they'll hold up in both winter and high-heat conditions.