حلقات O من PTFE 0.139 بوصة CS × 0.484 بوصة ID | AS568-206 | داش 206 | صلابة 20 (50/عبوة)

I needed o-rings that could handle extreme temperature swings in my lab setup, and these PTFE ones have performed flawlessly from cryogenic to high-heat cycles. The 20-durometer material seals tightly without deforming.

These 20-durometer rings are much softer than standard PTFE, which made them perfect for a low-pressure seal I needed where a harder ring would have leaked. The package of 50 gives me plenty of spares for future projects too.

That wide temperature range was the deciding factor for me—nothing else I found handles both cryogenic and 500°F conditions. The 20 durometer stiffness means they hold their shape perfectly during installation, and the 0.139" cross-section fit the groove snugly. Just what I needed for a demanding se