HSS Series Stainless Steel Worm Gear Clamp, 0.50 Inch Width, 1.81 To 2.75 Inch Diameter

You want your hose or tube outside diameter to land between 1.81 inches and 2.75 inches. A 2 inch OD sits comfortably inside that range, so the clamp should have adjustment room to tighten down properly.

Each grade brings something different to the table. The 300 series used for the band and housing gives you strong corrosion resistance across a wide range of environments, which matters when the clamp is exposed to moisture or chemicals over time. The 410 series on the screw is a harder martensitic stainless, so it holds up better under the repeated stress of tightening without stripping or galling the way a softer alloy might. Running a harder material on the fastening component and a more corrosion-resistant alloy on the structural parts is a pretty common and practical approach for clamps that need to last in tough conditions.

Absolutely, these are made with SAE 300 series stainless steel for the band and housing, and SAE 410 for the screw. That combo is made to resist corrosion, which is what you need when the weather gets rough.