Ideal Hose Clamp Size Chart
Quick answer: choose a hose clamp whose working range covers the outside diameter of the hose after it is installed on the fitting. For example, a common #24 worm gear clamp covers about 1-1/16 to 2 inches. Do not size only from the nominal hose ID.
Ideal Worm Gear Hose Clamp Size Chart
| Clamp size | Minimum diameter | Maximum diameter | Common use note |
|---|---|---|---|
| #4 | 1/4 in | 5/8 in | Small fuel/vacuum hose range |
| #6 | 3/8 in | 7/8 in | Small hose range |
| #8 | 1/2 in | 1 in | Small hose range |
| #10 | 9/16 in | 1-1/16 in | Small hose range |
| #12 | 1/2 in | 1-1/4 in | General hose range |
| #16 | 11/16 in | 1-1/2 in | General hose range |
| #20 | 3/4 in | 1-3/4 in | General hose range |
| #24 | 1-1/16 in | 2 in | Common radiator/utility range |
| #28 | 1-5/16 in | 2-1/4 in | Larger hose range |
| #32 | 1-9/16 in | 2-1/2 in | Larger hose range |
| #36 | 1-13/16 in | 2-3/4 in | Larger hose range |
| #40 | 2-1/16 in | 3 in | Larger hose range |
| #48 | 2-9/16 in | 3-1/2 in | Large hose range |
| #56 | 3-1/16 in | 4 in | Large hose range |
| #64 | 3-9/16 in | 4-1/2 in | Large hose range |
| #72 | 4-1/8 in | 5 in | Large hose range |
How To Measure For A Hose Clamp
- Install the hose on the fitting first, then measure the outside diameter.
- Pick a clamp where that outside diameter lands near the middle of the clamp range.
- Use stainless clamps where corrosion resistance matters.
- Use T-bolt or constant-tension clamps for demanding high-vibration or high-boost applications.
- Avoid over-tightening worm gear clamps on soft hose.
Source Notes
Clamp ranges were checked against Ideal-Tridon literature and product references including the Ideal-Tridon literature page, Ideal-Tridon catalog references, and hose-clamp sizing guidance. Confirm the exact series and material before ordering for critical applications.
