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Bosch ROS20 random-orbit sander port: measured 35 mm OD (EU convention). What shop-vac hose fits it and the exact reducer to join it to a 1-1/4, 2-1/2 or 4 inch hose.

Updated 05 September 2026.

PORT / HOSE

Bosch ROS20 random-orbit sander port dust port size

The measured dimensions of the Bosch ROS20 random-orbit sander port and the hose sizes it mates with.

OD35 mm1-3/8 in, 35 mm

Rings drawn to scale from the measured diameters in the table below.

Measured port dimensions

Port typemale spigot (hose goes over it)
Outer diameter (OD)1-3/8 in, 35 mm
Manufacturer designation35 mm OD (EU convention)
Mating diameter (mm)35

Shop notes

Found on: Bosch ROS20VSC and ROS65VC 5 in and 6 in random-orbit sanders.

The Bosch random-orbit sanders present the 35 mm extraction port, which the Bosch VAC024 hose and VAC004 adapter are built around. A 2-1/2 in shop-vac hose reaches it through the 35 mm step.

Connect this port

Questions and answers

What is the port type of the Bosch ROS20 random-orbit sander port dust port size?

male spigot (hose goes over it)

What is the outer diameter (od) of the Bosch ROS20 random-orbit sander port dust port size?

1-3/8 in, 35 mm

What is the manufacturer designation of the Bosch ROS20 random-orbit sander port dust port size?

35 mm OD (EU convention)

What is the mating diameter (mm) of the Bosch ROS20 random-orbit sander port dust port size?

35