حلقات O من بونا-إن نيتريل مقاس 0.21 بوصة CS × 0.599 بوصة ID | AS568-312 | داش 312 | صلابة 90 (400/عبوة)

I needed a bulk pack of dash 312 rings for a pneumatic manifold rebuild, and these being 90 durometer with a 0.21" cross section fit the spec exactly. The whole box came well-sealed, and the rubber feels noticeably firmer than the old ones I pulled off, so I'm confident they'll hold up in the -40°F

The 90 durometer on these o-rings gives a firm seal that holds up well under pressure. My previous pack of standard 70 durometer rings wore out faster, so this upgrade should last much longer.

I needed a bulk supply of these for a rebuild project and the 90 durometer hardness is exactly what I was after—they seat firmly without squishing out. The -40°F to +250°F range covers everything I run them through, and 400 per package means I won't be reordering anytime soon.