WEN HB321V Belt Sander Dust Port Size and Vacuum Adapter Guide
WEN HB321V 7.5-Amp 3 x 21 in. Variable Speed Belt Sander
Specifications
WEN HB321V Belt Sander Dust Port Size and Vacuum Adapter Guide
The WEN HB321V is a 7.5 amp, 3 x 21 in. variable speed belt sander. A belt sander is the dustiest tool in most shops. It strips wood fast, and all that wood turns into fine dust that the little cloth bag cannot keep up with. Hooking a shop vac to the port pulls the dust at the source, so it never reaches your air.
WEN lists the port size right on the product page, which most brands never do. The onboard port is 31.75 mm (1-1/4 in.) inside and 36.51 mm (1-7/16 in.) outside. A GulpDust PETG adapter matches that port on one end and your shop vac hose on the other, so the hose seals instead of falling off.
WEN HB321V Dust Port and Specs
| Dust port inner diameter | 31.75mm (1-1/4 in.) |
| Dust port outer diameter | 36.51mm (1-7/16 in.) |
| Port shape | Round |
| Connection type | Friction fit |
WEN HB321V Dust Port Size: 31.75 mm Inside, 36.51 mm Outside
The onboard dust port on the HB321V takes the included dust bag or a hose. WEN states the size: 1-1/4 in. (31.75 mm) inside and 1-7/16 in. (36.51 mm) outside.
Most shop vac hoses are 1-7/8 inch or 2-1/2 inch. Neither one seals on a 31.75 mm port by itself. That gap is why fine dust leaks out around the hose instead of going into it.
A GulpDust adapter is printed to match the sander port on one end and your vac hose on the other, so you get a snug fit with no tape and no clamps.
How to Connect a Shop Vac to the WEN HB321V
First, pull the dust bag off and clear any packed dust out of the port, so the seal is tight.
Press the small end of the PETG adapter onto the port. It is a friction fit, so a firm push holds it. Press your shop vac hose onto the other end. Turn the vac on before the belt touches wood.
Dust Bag vs. Shop Vac on a Belt Sander
The included bag catches the big chips, but the fine dust blows right through the cloth. Fine dust is the part that hangs in the air and gets into your lungs.
A shop vac pulls far more air than the bag ever traps, so the fine dust goes into the vac instead of into the room. On a sander that removes this much wood, the vac is the upgrade that matters most.
WEN HB321V Dust Collection FAQ
What size is the dust port on the WEN HB321V?+
The port is round. It is 31.75 mm (1-1/4 in.) on the inside and 36.51 mm (1-7/16 in.) on the outside. Those numbers come from the WEN product page.
Does the WEN HB321V work with a regular shop vac?+
Yes, with the right adapter. A standard shop vac hose is wider than the sander port. The GulpDust PETG adapter fits the port on one end and your vac hose on the other, so the hose stays put while you sand.
Do other WEN belt sanders use the same port size?+
Some do. The WEN HB6319 and the cordless 20418 both use the same 31.75 mm port, so one adapter size covers all three. The larger HB424V uses a smaller 30.7 mm port and needs its own adapter.
Do I need clamps or tape to attach the adapter?+
No. The adapter is a friction fit. You push it onto the port and it holds. The same goes for the vac hose end.
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.