Mirka 6-in. 2.5 mm Pneumatic Random Orbit Finishing Sander, Non-Vacuum (MR-625)
Mirka 6-in. 2.5 mm Pneumatic Random Orbit Finishing Sander, Non-Vacuum (MR-625)
Key Features
Overview
The Mirka MR-625 6 Inch Non-Vacuum Finishing Sander with 2.5mm Random Orbit is a pneumatic random orbit finishing sander built for fine surface prep and finish sanding. This is a finishing sander designed for fine finishing sanding applications. Model Number: MR-625. If you need a light, fast air sander that stays smooth in the hand and leaves a cleaner finish, this is the one this tool is aimed at.
The big story here is the tight 2.5 mm orbit. That smaller orbit is what makes this tool a better fit for fine finishing than heavier stock-removal work. It helps keep swirl marks to a minimum, which matters when you're sanding primer, paint prep, clearcoat blends, solid surface material, wood topcoats, or any job where the finish is only as good as the last sanding pass.
Mirka also gave the MR-625 a true 12,000 RPM top speed with variable speed control. On the job, that means you can move quickly when you need productivity, then back the speed down when the material or finish calls for a lighter touch. That kind of control is useful when you're switching between flat panel sanding, edge blending, and final pass work where it is easy to overwork the surface with a more aggressive setup.
The body is made from precision-molded composite material, and that matters for more than just weight. It helps keep the tool durable without making it feel heavy or clumsy, and it also helps reduce noise during use. For anyone sanding for hours at a time, less weight and less noise add up fast. At 2.4 lbs, this is the kind of air sander you can keep in rotation without feeling beat up by the end of the day.
Mirka counter-balances the MR-625 for a specific 6 inch backup pad, which helps the tool run smoother in actual use. Smooth operation matters on a finishing sander because chatter and unnecessary vibration can telegraph right into the surface. The moisture-resistant composite rotors and premium counterweight bearings are also there for a reason: longer service life and more reliable performance in shop conditions where air tools do real work.
This version is a non-vacuum sander, which is a good fit for users already set up for conventional air sanding or for work where a dedicated vacuum hookup is not required. That said, the MR-Series platform can be converted to vacuum operation with the addition of an external or self-generating vacuum adapter. That gives the tool some flexibility if your workflow changes later and you want better dust control.
The Mirka MR-625 makes the most sense for body shops, woodworking finish work, cabinet prep, composite finishing, and any pro or serious DIY user who wants a dedicated fine-finishing random orbit sander instead of a do-everything compromise tool. If your priority is finish quality, low fatigue, and predictable sanding behavior, this model is built for exactly that kind of work.
Built for Fine Surface Work
The MR-625 is set up for the kind of sanding where surface quality matters more than brute removal rate. Its small orbit, balanced 6 inch pad setup, and lightweight body make it easier to stay controlled through the final passes.
- 2.5 mm random orbit suited for fine finishing sanding applications
- Counter-balanced for a 6 inch backup pad for smoother operation
- Precision-molded composite body helps reduce noise and operator fatigue
What's in the Box
- (1) Mirka MR-625 Finishing Sander
- (1) 6 in. vinyl face backup pad
- (1) Pad wrench
- (1) Bottle of air-tool oil
Key Specifications
| Tool Type | Pneumatic random orbit finishing sander |
|---|---|
| Pad Diameter | 6 in. |
| Orbit Size | 2.5 mm (3/32 in.) |
| No-Load Speed | 12,000 RPM |
| Speed Control | Variable speed |
| Weight | 2.4 lbs |
| Vacuum Style | Non-vacuum |
| Construction | Precision-molded composite |
Compatibility
Built For
Pro Tip
The MR-625 is a fine-finishing sander, so let the small 2.5 mm orbit do the work. Pair it with the right abrasive sequence and keep pad condition in check. That is the easiest way to get the low-swirl finish this model is meant for.
Warranty & Support
Tool Nut's Take
Mirka MR-625 6 Inch Non-Vacuum Finishing Sander for clean finish work
This is a smart pick if you want a dedicated air sander for final surface quality, not a one-tool-does-everything compromise.
- Who it's for: Automotive refinishers, wood finishers, cabinet shops, and serious users doing fine sanding where swirl control matters.
- Why it stands out: The small 2.5 mm orbit, true 12,000 RPM performance, and low-fatigue composite body all point to one thing: better control on finish passes.
- Worth knowing: This is a non-vacuum model out of the box, so if dust extraction is part of your setup, plan on adding the proper vacuum adapter.
Common Questions
- What kind of sanding is the MR-625 best for? It is best suited for fine finishing sanding applications where a smaller 2.5 mm orbit helps reduce swirl marks.
- Is this a vacuum sander? No. This is a non-vacuum finishing sander, but MR-Series sanders can be converted to vacuum operation with an external or self-generating vacuum adapter.
- What is the maximum speed? The Mirka MR-625 runs up to a true 12,000 RPM and includes variable speed control.
- How much does it weigh? The listed tool weight is 2.4 lbs.