Connect a Bosch ROS20 random-orbit sander port to a Makita 28 mm anti-static hose
How to join a Bosch ROS20 random-orbit sander port to a Makita 28 mm anti-static hose, and what stops it leaking dust.
Not a direct fit. Joining the Bosch ROS20 random-orbit sander port to a Makita 28 mm anti-static hose needs a 35 mm to 28 mm step reducer.
Rings drawn to scale from the measured diameters in the table below.
The two ends
| End A | Bosch ROS20 random-orbit sander port (1-3/8 in OD, 35 mm OD) |
|---|---|
| End B | Makita 28 mm anti-static hose (1-1/8 in ID) |
| Fit type | male port into hose cuff |
| Reducer needed | 35 mm to 28 mm step reducer |
Shop notes
Measured across the joint between the Bosch ROS20 random-orbit sander port and the Makita 28 mm anti-static hose, the port (35 mm) is 7 mm larger than the hose (28 mm), so it will not seat. A 35 mm to 28 mm step reducer closes that 7 mm step so the two hold together instead of leaking at the gap.
A 7 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
Shop 35 mm to 28 mm step reducer on AmazonaffiliateFind 35 mm to 28 mm step reducer on eBayaffiliateRelated connections
- Bosch ROS20 random-orbit sander port35 mm OD (EU convention)
- Makita 28 mm anti-static hose28 mm (1-1/8 in)
- DeWalt DWS779 / DWS780 miter saw port to Makita 28 mm anti-static hoseneeds a reducer
- DeWalt miter saw dust elbow (1-1/2 in outer) to Makita 28 mm anti-static hoseneeds a reducer
- DeWalt random-orbit sander stepped port to Makita 28 mm anti-static hoseneeds a reducer
- 35 mm EU power-tool port (DeWalt / Bosch / Makita) to Makita 28 mm anti-static hoseneeds a reducer