Mirka 3-in. 5 mm Pneumatic Random Orbit Finishing Sander (MR-350)
Mirka 3-in. 5 mm Pneumatic Random Orbit Finishing Sander (MR-350)
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Product Details
Product Details
Key Features
Overview
The Mirka MR-350 Finishing Sander is a compact pneumatic finishing sander built for detail sanding, spot repair, and controlled surface prep in tighter work areas. This is a finishing sander designed for fine sanding and final surface preparation. Model Number: MR-350. With a 3 inch pad, 5 mm orbit, and air-powered drive, it is aimed at users who need a small-format sander that stays easy to control while still moving fast.
What makes this tool matter is the balance between speed and finesse. The true 12,000 RPM free speed gives the Mirka MR-350 Finishing Sander the output needed for productive finish sanding, while the 5 mm orbit helps it remove material efficiently without turning it into an aggressive roughing tool. On small panels, repair sections, edges, and other limited-access areas, that combination makes it easier to clean up a surface quickly and still leave it ready for the next step.
Mirka built the MR-Series around precision molded composites, and that is not just a materials note for the spec sheet. The composite housing is there to keep the tool strong and durable while reducing operator fatigue during extended use. It also helps reduce sound compared to heavier all-metal designs, which is a real benefit in shops where sanders run all day. If you spend hours doing finish prep, comfort is not a luxury feature. It directly affects consistency and control.
This sander is also counter-balanced for its specific backup pad size, which is one of those details experienced users care about right away. Proper balancing helps the tool run smoother, feel more planted in the hand, and stay more predictable on the work surface. Mirka also calls out moisture-resistant composite rotors, machined and balanced counterweights, and premium counterweight bearings, all of which point to the same thing: this tool is built for repeat use, not occasional hobby duty.
From a jobsite and shop-practicality standpoint, the Mirka MR-350 is straightforward. It is air powered, so it fits pneumatic setups where users want low tool weight and continuous runtime without battery swaps. It can also be converted to vacuum operation with a model-specific external or self-generating vacuum adapter. That matters if you are working in finishing environments where dust control improves surface quality and cleanup time.
The included grip style hook and loop backup pad keeps abrasive changes simple, which is a good fit for workflows where you move through multiple grits during surface prep. The included pad wrench and bottle of air-tool oil are also practical touches. You are not just getting the motor body. You are getting the basic setup needed to put the tool into service.
Who should buy it? The best fit is automotive refinish work, body shop sanding, small-part finishing, woodworking detail prep, and any shop that already runs air tools and wants a compact random orbit style finishing sander for smaller areas. If your work is mostly large flat panels, you will probably want a bigger pad size. But if you need maneuverability, light weight, and smooth finish work in a smaller format, the MR-350 makes a lot of sense.
Compact Control for Small-Area Sanding
The smaller 3 inch pad size gives this sander an advantage when full-size sanders feel clumsy. It is easier to guide on tight work, curved sections, and repair zones where control matters as much as speed.
- 3 inch pad size for tighter sanding areas
- 5 mm orbit for efficient finish sanding and surface prep
- Counter-balanced design matched to its backup pad size
What's in the Box
- (1) Mirka MR-350 Finishing Sander
- (1) Grip (Hook & Loop) backup pad
- (1) Pad wrench
- (1) Bottle of air-tool oil
Key Specifications
| Tool Type | Finishing Sander |
|---|---|
| Power Source | Air Powered |
| Pad Size | 3 in |
| Orbit Size | 5 mm |
| No-Load Speed | 12,000 RPM |
| Pad Type | Grip (Hook & Loop) backup pad |
| Housing Material | Precision Molded Composites |
| Vacuum Capability | Convertible with model-specific vacuum adapter |
Compatibility
Built For
Pro Tip
Use the MR-350 where a larger pad starts fighting the workpiece. On spot repairs and tighter sections, the 3 inch size lets you stay on the target area instead of sanding farther out than you need to.
Tool Nut's Take
Mirka MR-350 Finishing Sander is a smart pick for detail work
If you need a compact air sander that stays comfortable in hand and does clean finish work on smaller areas, this one checks the right boxes without getting complicated.
- Who it's for: Automotive refinish users, woodworkers, and shop pros who need a small-format finishing sander for spot work and controlled surface prep.
- Why it stands out: The 3 inch size, 5 mm orbit, true 12,000 RPM speed, and composite build make it easy to handle without giving up productivity.
- Worth knowing: This is an air-powered tool, so it makes the most sense if you already run a pneumatic setup. It is also focused on smaller-area finishing, not broad-panel sanding.
Common Questions
- Is the Mirka MR-350 Finishing Sander air powered or electric? It is an air-powered finishing sander.
- What size pad does this sander use? It uses a 3 inch backup pad.
- What is the orbit size? The orbit size is 5 mm.
- Can this sander be used with dust extraction? Yes. MR-Series sanders can be converted to vacuum operation with the proper adapter.
- How fast does it run? The listed free speed is 12,000 RPM.
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