حلقات O من بونا-إن نيتريل بقطر مقطع 0.139" × قطر داخلي 2.109" | AS568-227 | داش 227 | صلابة 50 (100/عبوة)

The soft 50 durometer compound makes these seat perfectly in a shallow groove without any extra muscle, and the -40°F rating gives me confidence for my outdoor hydraulic lines this winter. Sorted through the whole bag and every one of the 100 rings held its round shape with no flash or deformation.

The seal on my hydraulic cylinder stopped leaking after I swapped to these 2.109" ID o-rings. They handle the heat from my shop compressor just fine, and the 50 durometer hardness gives just enough flexibility without crushing.

The packaging had exactly 100 rings, and the 50 durometer hardness is noticeably more forgiving than harder seals I've used—easy to seat in a groove without tweezers. They’ve held up fine so far in a mild hydraulic setup, though I haven’t pushed them near the 250°F limit yet.