0.21" CS x 3.35" ID 氟橡膠FKM O型環 | AS568-340 | Dash 340 | 硬度90 (16個/包)

Replaced the leaking seal in my hydraulic press and these 340s fit perfectly without any wrestling to get them seated. The 90 durometer feels solid, and since they handle up to 400°F I won't worry about the hot oil breaking them down.

The 90 durometer rating on these gives them a firm, durable feel that seals perfectly in my high-temp application. They slid right into the groove without any twisting, and they've held up great under continuous 350°F exposure.

Finally found Viton o-rings that actually handle the high heat near my engine components without degrading. The 90 durometer feels noticeably firmer than standard rubber, which gives me confidence these will seal properly under pressure. Already ordered another pack for my backup parts stash.