Bosch PROFACTOR 18V and CORE18V tools use a 35mm outer-diameter dust port. This is a unique size, between the Milwaukee/DeWalt 32mm standard and the Makita 36mm standard. A 32mm adapter will be loose on a 35mm port. A 36mm adapter will not fit. You need a 35mm adapter.
Bosch Tool Port Sizes
| Model | Tool | Port OD | Notes |
|---|---|---|---|
| GKS18V-25GCN | PROFACTOR 18V Circular Saw 7-1/4" | 35mm | Top of PROFACTOR lineup |
| GST18V-LI | 18V CORE Jigsaw | 35mm | Compatible with Bosch blades |
| GEX18V-2CN | PROFACTOR 18V Random Orbit Sander | 35mm | Variable speed |
| GKT13-225L | Track Saw with L-BOXX (corded) | 35mm | 6-1/2" blade, click-clean hose |
| GKF18V-25GCN | PROFACTOR 18V Colt Router | 35mm | Compact router base |
| GOP40-30C | StarlockPlus Oscillating Multi-Tool (corded) | 35mm | Oscillating tool |
What Adapter You Need
For any Bosch PROFACTOR or CORE18V tool and a standard US shop vac with a 1-7/8 inch hose:
You need a 35mm to 47.6mm adapter.
If you pair Bosch tools with a Festool CT extractor (27mm hose), you need a 35mm to 27mm adapter.
The GKT13-225L Track Saw
The Bosch GKT13-225L is a 6-1/2 inch corded track saw. It uses Bosch's click-clean hose system, which is a push-button hose connection rather than friction. The port OD is 35mm.
Bosch supplies the GKT13-225L with a click-clean hose. If you want to use a different shop vac hose, you need a 35mm friction adapter for the standard shop vac end. The click-clean lock on the tool side can be bypassed with a friction-fit adapter that applies constant outward pressure against the click-clean socket.
For standard 1-7/8 inch shop vac use, a 35mm to 47.6mm PETG adapter slides over the port and provides a friction-fit seal that holds well during cutting.
Bosch Click-Clean vs Friction Hose Systems
Bosch introduced the click-clean system on some tools to make hose changes faster without pulling against the friction seal. The system uses a push-button release on the hose cuff.
Standard friction adapters still work on click-clean ports. The adapter simply presses against the port stub and the click-clean latch does not engage. The friction seal from the adapter holds the connection just as well as the click-clean latch.
Metabo HPT: Same Port Size as Bosch
Metabo HPT (formerly Hitachi) tools also use a 35mm port. If you own both Bosch and Metabo HPT tools, the same 35mm adapter covers both brands. This is one of the few cases where two different brands share a port size standard.