2-1/2 in shop-vac hose diameter vs 4 in dust-collector hose diameter: specs compared
Updated 05 September 2026.
102 mm
4 in dust-collector hose diameter wins on mating diameter
On mating diameter, 4 in dust-collector hose diameter leads: 102 mm versus 57 mm.
| Spec | 2-1/2 in shop-vac hose diameter | 4 in dust-collector hose diameter |
|---|---|---|
| Fitting type | female cuff (goes over a port or into a socket) | female cuff (goes over a port or into a socket) |
| Inner diameter / bore (ID) | 2-1/4 in, 57 mm | 4 in, 102 mm |
| Cuff outer diameter (OD) | 2-1/4 in | 4-1/4 port in |
| Nominal size | 2-1/2 in nominal, cuff approx 2-1/4 in OD | 4 in ID |
| Mating diameter (mm) | 57 | 102 |
Questions and answers
Which has the higher mating diameter, 2-1/2 in shop-vac hose diameter or 4 in dust-collector hose diameter?
On mating diameter, 4 in dust-collector hose diameter leads: 102 mm versus 57 mm.
How do 2-1/2 in shop-vac hose diameter and 4 in dust-collector hose diameter compare?
On mating diameter, 4 in dust-collector hose diameter leads: 102 mm versus 57 mm.