0.139" CS X 3.734" ID حلقات O-Ring من Viton FKM | AS568-240 | داش 240 | صلابة 75 ديرومتر | أسود (13 / عبوة)

Finally found replacement o-rings for a high-temp flange that kept failing at 300°F, and these Viton ones have held up perfectly for a month now. The 3.734" inner diameter fit snug without any wrestling, and the 75 durometer feels firm but still flexible. Just ordered two more packs for spares.

Installed these on a hydraulic fitting that sees 350°F, and the Viton material held up perfectly with no softening or leaks. The 0.139" cross-section gives a nice solid feel when seated, too.

Finally, an o-ring that actually seals my hydraulic manifold without leaking under pressure. The 75 durometer feels exactly right—stiff enough to hold shape, but it seated into the groove without fighting me. Priced per package, so I ordered two sets and swapped out all the worn ones in one go.