0.139" قطر داخلي × 3.734" حلقات O-Ring من HNBR | AS568-240 | داش 240 | صلابة 90 (10 / عبوة)

Installed these HNBR 240 o-rings on a hydraulic fitting that sees constant heat, and the 90 durometer holds up perfectly without any deformation. They fit snugly and the -40°F rating gives me confidence for winter use.

I needed a seal that could handle higher temperatures than standard Buna-N, and these HNBR rings fit the bill perfectly at 300°F. The 3.734" ID matched the groove in my hydraulic cylinder exactly, and the 90 durometer gives them a firm, reliable feel during installation.

The 90 durometer HNBR material feels noticeably sturdier than standard nitrile, and these dash 240s fit perfectly into my hydraulic piston gland. They sealed immediately on the first pressure test with zero weeping.