حلقات O-Ring HNBR 0.21 بوصة CS × 4.225 بوصة ID | AS568-347 | داش 347 | صلابة 90 (5 / عبوة)

Used these to replace weather seals on a hydraulic cylinder, and the HNBR material holds up well under constant heat exposure. The -40°F range gives me peace of mind for winter storage, and they seated perfectly without any twisting.

The 0.21" cross-section on these HNBR o-rings was exactly what I needed to seal a stubborn hydraulic port, and they’ve held up perfectly under steady 250°F heat for two weeks now without any leaks.

Used these for a high-temp compressor rebuild and the 90 durometer held up much better than standard Buna-N. The -40°F to +300°F range gives me confidence they'll last in that application.