حلقات O-Ring من النتريل بونا-N | AS568-158 | داش 158 | صلابة 70 | أسود (150 / عبوة)

Used these for a pneumatic cylinder rebuild and the 70 durometer hardness was exactly what the spec called for. They seated perfectly in the groove without any binding, and the package of 150 gives plenty of spares for the price.

The temperature range is the reason I bought these, and they've held up perfectly in my outdoor hydraulic fittings through a freezing winter. I've used about half the bag already and not a single one has cracked or deformed.

The 70 durometer hardness feels just right for my hydraulic fittings, and the -40°F to +250°F range gives me peace of mind for outdoor equipment through the seasons. A full 150 pack means I won't run out mid-project, and every single ring in the bag has held its shape without any cracking so far.