Dust collection would be simple if every tool used the same port size. They do not. Here is a full breakdown of the standard sizes, which tools use them, and how to connect them to each other.
The Four Standard Sizes
1-1/4 Inch
This is the smallest common dust port. It is used on compact and detail-oriented tools where a large port would get in the way.
Common tools on the 1-1/4 in. port hub:
- Compact routers (Bosch Colt, DeWalt DWP611)
- Oscillating multi-tools with dust attachments
- Detail sanders
- Some scroll saws
Shop vac connection: You need a 1-1/4 inch to 2-1/2 inch adapter to connect to a standard shop vac hose.
1-1/2 Inch
The most common size on handheld corded and cordless tools. Many budget shop vacs also include a 1-1/2 inch crevice tool in their accessory kit.
Common tools on the 1-1/2 in. port hub:
- Circular saws (most models)
- Jigsaws
- Most cordless sanders
- Biscuit joiners
- Many Makita and Ryobi tools
Shop vac connection: Most standard shop vac hoses are 2-1/2 inch. You need a 1-1/2 to 2-1/2 inch adapter.
2-1/2 Inch
The standard size for most shop vac hoses. Tools on the 2-1/2 in. port hub connect straight to a shop vac hose with no adapter.
Common tools on the 2-1/2 in. port hub:
- Random orbit sanders (5-inch and larger)
- Large routers with dust shrouds
- Miter saws with built-in dust collection (some models)
- Belt sanders
- Planer dust chutes
Note: Even when the size matches, the connection angle or shape may differ between brands. A custom adapter can create a better connection than a generic one.
4 Inch
The standard size for dedicated dust collectors, like central dust collection systems and large floor sweeps. A 4-inch duct can move far more air than a shop vac hose.
Common uses for 4-inch ports:
- Table saw dust collection (port at the cabinet base)
- Band saws
- Jointers
- Planers
- Floor sweeps and wall inlets
Shop vac connection: Standard shop vacs cannot handle 4-inch hose efficiently. For 4-inch tools, you need a dedicated dust collector (1-1/2 to 2 HP minimum) or a strong 2-stage unit.
Connecting Different Sizes
Most workshops have a mix of port sizes. You do not need a separate vacuum for each. You need reducers and adapters that let you connect any tool to your main vacuum or collector.
Common adapter combinations:
| Your Tool | Vacuum Hose | Adapter Needed |
|---|---|---|
| The 1-1/4 in. port hub | 2-1/2" | 1-1/4 to 2-1/2 reducer |
| The 1-1/2 in. port hub | 2-1/2" | 1-1/2 to 2-1/2 reducer |
| The 2-1/2 in. port hub | 2-1/2" | Usually direct (sometimes brand-specific adapter) |
| The 4 in. port hub | 2-1/2" | 4 to 2-1/2 reducer (loses efficiency) |
| 4" | 4" | Direct (needs dedicated dust collector) |
A Note on Fit Quality
Shape varies between brands even at the same size. A Milwaukee saw port is not the same shape as a Makita saw port. Generic adapters leave a gap or need tape to seal. Ours are built to the shape, not just the number.
A custom 3D-printed adapter is sized to the inside of your tool port on one end and your hose on the other. The fit is snug. You keep strong suction instead of leaking around the joint.
Use our configurator to find the exact adapter for your tool and vacuum combination.