حلقات O من بونا-ن نيترايل | CS 0.21" × ID 0.849" | AS568-316 | داش 316 | صلابة 90 (300/عبوة)

The 90-durometer hardness is exactly what I needed for a high-pressure seal, and they arrived well-packed with a clean, uniform finish. Slipped right onto the fitting without any hassle, and the -40°F rating gives me confidence for winter use.

Ordered these for a hydraulic repair job and the 90 durometer hardness is exactly what we needed—they seat firmly without squishing out under pressure. The 0.21" cross-section feels chunky and consistent across the whole bag, which is reassuring when you're buying 300 at once. Fast shipping too, but

Needed the 90 durometer for a high-pressure hydraulic fitting, and these 316s seated perfectly without any distortion. The box of 300 will last me years of rebuilds, and they've handled the 200°F service temps without a single failure so far.