Connect a Skilsaw SPT99T table saw port to a 1-1/4 in shop-vac hose
How to join a Skilsaw SPT99T table saw port to a 1-1/4 in shop-vac hose, and what stops it leaking dust.
Not a direct fit. Joining the Skilsaw SPT99T table saw port to a 1-1/4 in shop-vac hose needs a 2-1/4 in to 1-1/4 in step reducer.
Rings drawn to scale from the measured diameters in the table below.
The two ends
| End A | Skilsaw SPT99T table saw port (2-1/4 in ID) |
|---|---|
| End B | 1-1/4 in shop-vac hose (approx 1-1/2 cuff in OD, 1-1/4 in ID) |
| Fit type | hose cuff into female socket |
| Reducer needed | 2-1/4 in to 1-1/4 in step reducer |
Shop notes
Measured across the joint between the Skilsaw SPT99T table saw port and the 1-1/4 in shop-vac hose, the port socket (57 mm) is 25 mm larger than the hose tip (32 mm), so the hose tip rattles inside without gripping. A 2-1/4 in to 1-1/4 in step reducer closes that 25 mm step so the two hold together instead of leaking at the gap.
A 25 mm mismatch feels close enough to force, and it will hold for a minute before it works loose under airflow. Fit the step ring rather than trusting friction on a gap this size.
The reducer to buy
Search Amazon for 2-1/4 in to 1-1/4 in step reduceraffiliate searchRelated connections
- Skilsaw SPT99T table saw port2-1/4 in ID for a 2-1/2 in hose
- 1-1/4 in shop-vac hose1-1/4 in (approx 32 mm)
- DeWalt DWS779 / DWS780 miter saw port to 1-1/4 in shop-vac hoseneeds a reducer
- DeWalt random-orbit sander stepped port to 1-1/4 in shop-vac hoseneeds a reducer
- 35 mm EU power-tool port (DeWalt / Bosch / Makita) to 1-1/4 in shop-vac hoseneeds a reducer
- 1-1/4 in shop-vac hose to 2-1/2 in shop-vac hoseneeds a reducer