Makita 9404 Belt Sander Dust Port Size and Shop Vac Adapter
Makita 4 in. Belt Sander
Specifications
Connect your Makita 9404 to your shop vac
Pick what you are connecting to. Each one is a finished PETG adapter, sized for both ends. Print it yourself or have it shipped, made in the USA.
Standard hose & duct sizes
Popular vacuums & extractors
Not sure which size? Walk through the configurator or measure your port.
Makita 9404 Belt Sander Dust Port Size and Shop Vac Adapter
The Makita 9404 is a 4 inch belt sander. It hogs off stock fast and levels big surfaces in a hurry. All that fast cutting throws a lot of dust and grit.
Makita lists the dust port at 25 mm on the inside and 31 mm on the outer cuff. Our PETG adapter plugs into the 25 mm port and steps it up to any standard shop vac or dust extractor hose. No tape. No clamps.
Makita 9404 Dust Port and Specs
| Dust port inner diameter | 25.0mm |
| Dust port outer cuff | 31.0mm |
| Port shape | Round |
| Port location | Side |
| Connection type | Friction fit |
| Belt width | 4 in. |
Makita 9404 Dust Port Size: 25 mm Round Inlet, 31 mm Outer Cuff
Makita publishes the 9404 dust connection as 25 mm in and 31 mm out. The 25 mm figure is the inside of the port, which is what our adapter plugs into. The 31 mm figure is the outer cuff that a hose can slip over.
The 9404 comes with a small dust bag, but a bag fills fast and lets fine dust escape. Most shop vac hoses are 1-7/8 inch or 2-1/2 inch, far too big for this 25 mm port, so a taped hose leaks.
A GulpDust adapter fits the 25 mm port on one end and your bigger vac hose on the other end, so you get a tight seal and steady pull instead of a bag that keeps filling up.
How to Connect a Shop Vac to the Makita 9404
Take the dust bag off and clear any dust out of the port first. A clean port gives the best grip.
Push the small end of the PETG adapter into the 25 mm port. It is a friction fit, so it holds with a firm press. Then press your shop vac or dust extractor hose onto the wide end.
Turn the vac on before you start sanding. A belt sander makes dust fast, so a running vac keeps up far better than the small bag.
Why Dust Collection Matters on a Belt Sander
A belt sander removes stock fast. That means a lot of dust in a short time. The stock dust bag cannot hold it all and lets the fine part blow into the air.
Pulling the dust at the port with a vac keeps the bench and the air clean. It also keeps your view of the work clear so you sand flat and even.
For the best result, match the adapter to the 25 mm port and run a steady vac. Any shop vac with the right adapter beats the small bag.
Makita 9404 Dust Collection FAQ
What size is the dust port on the Makita 9404?+
Makita lists it as 25 mm on the inside and 31 mm on the outer cuff. It is a round port on the side of the sander. Our adapter plugs into the 25 mm inlet.
Does the Makita 9404 work with a regular shop vac?+
Yes, with an adapter. Most shop vac hoses are much bigger than the 25 mm port. The GulpDust PETG adapter fits the sander port on one end and your vac hose on the other.
Is a shop vac better than the dust bag on the 9404?+
Yes, in most cases. The bag fills fast and lets fine dust escape. A vac pulls steadily and catches more of the dust at the port.
Do I need clamps to attach the adapter?+
No. The adapter is a friction fit. You press it into the port and it holds. The vac hose end works the same way.
Can I print this adapter myself?+
Yes. You can buy the printed PETG part shipped from the US, or download the STL file and print it at home. We suggest PETG with 3 walls and 25 percent infill.
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