Key Features
Overview
The Mirka MR-5 5 in. Non-Vacuum Finishing Sander, Model MR-5, is a pneumatic random orbit finishing sander built for professional surface prep and finish sanding. This is a random orbit finishing sander designed for sanding, refining surfaces, and getting a more consistent finish with less operator fatigue. If you want a compact air-powered sander for body work, woodworking, or general finishing work, this is the kind of tool that earns its keep by staying light, running fast, and holding up over time.
The big performance number here is the true 12,000 RPM top speed paired with a 5 mm, or 3/16 inch, orbit. In practical terms, that gives the Mirka MR-5 enough cut to move material efficiently while still being manageable for finish work. It uses a 5 inch pad size, which is the standard sweet spot for a lot of sanding tasks because discs are easy to find, the tool stays maneuverable, and you can work broad panels without stepping up to a bulkier machine.
Mirka built this sander with precision molded composite construction instead of making it heavier than it needs to be. That matters on real jobs because the lighter body helps reduce arm and wrist fatigue during long sanding sessions. The composite housing also helps reduce sound for a more comfortable working environment. Add in the palm-style design and specific counter-balancing for the backup pad, and you get a sander that feels more controlled instead of chattery and tiring.
Durability is another strong point. The MR-5 uses moisture-resistant composite rotors, machined and balanced counterweights, and premium counterweight bearings. Those are the kinds of parts that matter on air tools because they directly affect reliability, smoothness, and service life. If your shop runs pneumatic tools hard, those details are not fluff. They are what keep the tool working consistently instead of developing vibration, noise, or premature wear.
For shop setup, this is a non-vacuum model out of the box, which makes it straightforward for users who already have a preferred dust strategy or just need a simple air sander for targeted finishing work. It runs at 90 PSI and has an average air consumption of 17 CFM, so you will want to pair it with an air system that can keep up. Mirka also notes that MR-Series sanders can be converted to vacuum operation with a model-specific adapter or conversion kit, which gives the tool more flexibility if your workflow changes later.
The included package contents are practical: a backup pad, pad wrench, and a bottle of air-tool oil. That means you are not starting from zero when the box shows up. For users already set up with compressed air, the MR-5 makes the most sense in collision repair, woodworking shops, refinish work, and general surface prep where a compact 5 inch random orbit sander gets used all day. If you want cordless convenience, this is not that tool. If you want a proven air-powered finisher that stays light, fast, and dependable, it absolutely is.
Fast Finish Sanding Without the Bulk
The Mirka MR-5 keeps things simple: compact size, strong speed, and a pad size that works for a huge range of finishing jobs. It is easy to control on flat panels, edges, and repair areas where a larger sander starts to feel clumsy.
- 5 inch sanding size for common finishing and prep work
- 5 mm orbit balances stock removal and finish control
- Palm-style body helps keep the tool steady in one-handed use
Built for Long Shop Days
What separates a decent air sander from one you actually like using is how it feels after an hour, not five minutes. The composite build, reduced sound, and balanced internals are the details that make this one easier to live with in a production setting.
- Net tool weight is 1.78 lbs
- Precision molded composite housing helps reduce fatigue
- Moisture-resistant composite rotors and premium bearings support long-term reliability
What’s in the Box
- (1) Mirka MR-5 5 in. Non-Vacuum Finishing Sander
- (1) Backup pad
- (1) Pad wrench
- (1) Bottle of air-tool oil
Key Specifications
 Pad Size | 5 in |
|---|---|
 Orbit Size | 5 mm (3/16 in) |
|
No-Load Speed (RPM) | 12,000 RPM |
 Power Source | Pneumatic |
 Pressure Rating (PSI) | 90 PSI |
 Average Air Consumption | 17 CFM |
|
Net Tool Weight (lbs) | 1.78 lbs |
 Made In | Finland |
Compatibility
Built For
Pro Tip
If you are using the Mirka MR-5 for long finish passes, make sure your air supply can actually hold 90 PSI at the tool under load. A lot of sanding problems that feel like weak cut or inconsistent finish are really air delivery issues, not sander issues.
Warranty & Support
Tool Nut’s Take
Mirka MR-5 5 in. Non-Vacuum Finishing Sander Gets the Basics Right
This is a smart buy for anyone who wants a light, fast, air-powered finishing sander without paying for features they do not need on day one.
- Who it’s for: Pros and serious DIY users doing finish sanding, panel prep, and general surface refinement in a shop with solid compressed air.
- Why it stands out: The low weight, 12,000 RPM speed, 5 mm orbit, and balanced composite build make it easy to run for long stretches without feeling beat up.
- Worth knowing: It is a non-vacuum model out of the box, so plan around your dust setup. The good news is it can be converted later if your workflow calls for vacuum sanding.
Common Questions
- Is this a corded or cordless sander? Neither. The Mirka MR-5 is a pneumatic sander that runs on compressed air.
- Can this sander be used with vacuum extraction? Yes. MR-Series sanders can be converted to vacuum operation with a model-specific adapter or conversion kit.
- What size sanding disc does it use? It is built around a 5 inch pad size.
- How fast does it run? The rated top speed is 12,000 RPM.
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