حلقات O-Ring من HNBR مقاس 0.139 بوصة CS × 0.609 بوصة ID | AS568-208 | داش 208 | صلابة 80 (100/عبوة)

The 80 durometer on these HNBR rings is noticeably firmer than standard Buna-N, which is exactly what I needed for a high-temp application. They seated perfectly in the groove and the pack of 100 gives me plenty of spares for future repairs.

Had to replace some old seals in a hot oil system and these HNBR rings handled the 250°F operating temp without issue. The 80 durometer feels stiffer than what I pulled out, but they're holding pressure perfectly so far.

Put these in a high-temp hydraulic fitting on a press that runs near 250°F, and they've held up perfectly without any softening. The 80 durometer feels just right—stiff enough to stay seated but not so hard that they crack during installation.