حلقات O-ring من مطاط بونا-إن نيتريل 0.139" CS × 3.484" ID | AS568-238 | داش 238 | صلابة 70 | أسود (200 / عبوة)

Finally found the right size to replace the worn seals on my hydraulic cylinder; the 3.484" ID fits perfectly and the material feels quality. I've bought cheaper o-rings before, but these actually seal without any leaks.

The 70 durometer is exactly the firmness I needed for these seals, and the 3.484" inner diameter fit perfectly in the groove. I bought the 200-pack to last through multiple rebuilds, and every ring has been uniform without any flash or imperfections.

I needed a large batch of these for a pneumatic rebuild project, and the 0.139" cross-section seals perfectly in the groove. The -40°F to +250°F range gives me confidence they'll hold up in any weather.