2-Ear Pinch Clamp, Zinc Plated Steel, 0.512 - 0.592 Inch Clamping Range, 0.295 Inch Width

You want the hose OD to land inside the clamp’s 0.512 to 0.592 inch clamping range. The nominal size is 0.5625 inch, so a hose that is about 9/16 OD is in the window.

Optimal installation involves fully closing one ear before partially closing the second. This creates a spring-like action, ensuring a reliable and lasting grip against pressure, vibration, and hose shrinkage.

Close the first ear all the way before you touch the second one. Then close the second ear just enough so the first ear opens back up slightly, leaving about a 1/16 inch gap. That sequence builds tension into the clamp so it acts more like a spring, which helps it stay tight against pressure, vibration, and hose shrinkage over time. If you can close both ears completely flat, the clamp is likely too large and you should drop down to the next smaller size.