حلقات O من مطاط بونا-إن نيتريل | AS568-428 | داش 428 | صلابة 70 | أسود (40 / عبوة)

The temperature range on these is what sold me—handled the heat in my compressor without any softening. All forty rings arrived uniform, no flashing or nicks, and at 70 durometer they're firm but still easy to seat.

First time using AS568-428 size and these fit perfectly on a hydraulic fitting I was rebuilding. The -40°F to +250°F range gives me peace of mind for outdoor equipment that sees extreme weather changes.

These o-rings fit my old hydraulic cylinder perfectly; the 70 durometer feels firm enough to hold pressure. I appreciated that they arrived in a sealed pack of 40, keeping them clean for storage.