حلقات O-Ring من HNBR بقطر داخلي 0.21" × 4.1" | AS568-346 | داش 346 | صلابة 90 (5 / عبوة)

The 90 durometer feels reassuringly stiff, so I’m confident these will hold up under constant heat near my compressor. They slipped into the groove with a snug, solid fit, and the -40°F to +300°F range covers everything I need.

The 90 durometer hardness is exactly what I needed for a high-pressure seal that kept deforming with softer rings. These held their shape perfectly during a 250°F test run, and the temperature range gives me confidence for year-round outdoor use.

Fit perfectly onto my hydraulic cylinder and the 90 durometer feels much stiffer than the standard black rings I was using before. Only gave it four stars because I expected a slightly softer feel for the application, but they seal well.