Mirka® DEROS II 350 orbital sander

Mirka DEROS II 350 Orbital Sander, Complete Overview

The Mirka DEROS II 350 is an electric orbital sander designed for professionals who refuse to compromise on finish quality.

With its 3.5 mm orbit and brushless motor, it provides precise and consistent sanding on all surfaces, even the most delicate ones.

Lightweight, quiet, and easy to handle, it is the kind of tool you can use all day without fatigue.

What is the Mirka DEROS II 350 orbital sander?

The Mirka DEROS II 350 is a compact electric orbital sander, designed for precision sanding on flat or slightly curved surfaces. Its Ø 77 mm pad and 3.5 mm orbit make it a tool tailored for fine finishing and working on small areas.

It is part of Mirka's DEROS II range, a direct evolution of the first-generation DEROS. With its brushless motor, electronic speed control, and low vibration, the DEROS II 350 is designed for intensive use without fatigue.

At Dagobert Industrie, we particularly recommend it for automotive bodywork, fine cabinetry, and sanding complex parts where control over the sanding motion is essential.

Mirka: Finnish manufacturer specializing in dust-free sanding

Mirka is a company founded in 1943 in Finland. It is now recognized worldwide as a pioneer in clean sanding, that is to say, dust-free.

Their flagship innovation: open-structure abrasives (like Abranet), combined with machines featuring high-performance integrated extraction. The result is less clogging, a cleaner surface, and a healthier work environment.

Mirka designs both the machines and the abrasives. This consistency between tool and consumable is a real advantage compared to manufacturers who only master part of the chain, such as Festool or Bosch, which also offer complete solutions but with different philosophies.

Technical specifications of the Mirka DEROS II 350CV

The Mirka DEROS II 350CV is a compact electric orbital sander designed for fine sanding work on small surfaces. It runs on 230 V mains power and develops 350 W of power.

Its speed is electronically adjustable from 4,000 to 10,000 rpm. The constant speed control under load ensures a steady rate, even when applying firm pressure to the workpiece.

Ø 77 mm pad and 5.0 mm random orbit: what is it used for?

The 77 mm diameter pad is the compact size in the DEROS II range. It allows access to tight areas inaccessible to 125 or 150 mm pads: corners, moldings, door panels, and complex bodywork areas.

The 5.0 mm random orbit is a balanced compromise. It removes more material than a 3 mm orbit while leaving a cleaner finish than an 8 mm one. It is the ideal setting for intermediate sanding and finishing on wood, varnish, or primer.

• Power: 350 W
• Pad: Ø 77 mm
• Orbit: 5.0 mm
• Speed: 4,000-10,000 rpm (adjustable)
• Power supply: 230 V / 50 Hz
• Abrasive attachment: Velcro

Model	Pad	Orbit	Power	Main use
Mirka DEROS II 350CV	Ø 77 mm	5.0 mm	350 W	Finishing tight areas, bodywork, wood
Mirka DEROS II 550CV	Ø 125 mm	5.0 mm	350 W	Finishing medium surfaces, bodywork
Mirka DEROS II 650CV	Ø 150 mm	5.0 mm	350 W	Finishing large surfaces, bodywork
Festool ETS 125 REQ	Ø 125 mm	3.0 mm	250 W	Ultra-fine finishing, cabinetry

Comparison: Mirka DEROS II 350 versus other orbital sanders on the market

The Mirka DEROS II 350 stands out for its brushless motor, low weight (~900 g), and compatibility with the Mirka central extraction system. Against the competition, it clearly holds its own.

Here is a direct comparison with four orbital sanders commonly used in workshops and body shops:

Model	Orbit	Weight	Motor	Integrated extraction	Main use
Mirka DEROS II 350	3.5 mm	~900 g	Brushless	Yes (Mirka system)	Finishing, bodywork, wood
Mirka DEROS II 550	5.0 mm	~950 g	Brushless	Yes (Mirka system)	Stock removal, surfacing
Festool ETS EC 150/3	3.0 mm	~1,100 g	Brushless	Yes (Festool CT)	Wood finishing, lacquer
Bosch GEX 125-150 AVE	2.5 / 4.0 mm	~1,500 g	Brushed	Yes (bag)	General use
Rupes LHR 15 Mark III	15 mm (polishing)	~1,350 g	Brushed	No	Bodywork polishing

With a 3.5 mm orbit, the DEROS II 350 is built for precise finishing: it avoids sanding marks and works without tearing the material.

Compared to the Festool ETS EC 150/3, it offers a more contained weight and better ergonomics for long sessions. The Festool remains relevant for workshops already equipped with CT extractors.

The Bosch GEX costs less to purchase, but its brushed motor, weight, and vibrations clearly position it below for intensive or professional use.

In summary: if the priority is finishing, lightness, and durability in professional use, the Mirka DEROS II 350 does not really have a direct competitor in this orbit range.

Compatible accessories and integrated extraction system

The Mirka DEROS II 350 is designed to work with the entire Mirka accessory ecosystem. It accepts Mirka Velcro-backed abrasives in 150 mm format, notably the Abranet, Galaxy, and Basecut ranges.

The integrated extraction is one of the strong points of this machine. The perforated backing pad and Abranet net abrasives work in synergy to evacuate dust directly at the source, without leaving residue on the surface.

For optimal extraction, the DEROS II 350 connects to a Mirka vacuum unit (such as the DE 1230 L AFC or equivalent) via a central hose. This pairing ensures a clean workstation and reduces exposure to fine dust.

Here are the directly compatible accessories:

• Mirka Abranet abrasives, full net, maximum extraction
• Mirka Galaxy abrasives, general use, good service life
• Mirka Basecut abrasives, rapid stock removal
• Mirka replacement backing pads, soft or rigid depending on the support
• Mirka hoses and fittings, direct connection to the vacuum

Compatibility with standard 150 mm abrasives from other manufacturers (Klingspor, Norton, 3M) remains possible, provided the perforation matches the backing pad.

Applications and sectors for the DEROS II 350

The Mirka DEROS II 350 is a compact random orbital sander designed for precision sanding work on small surfaces and hard-to-reach areas.

Its 77 mm pad and 3.5 mm orbit make it a tool tailored for fine finishing, where a standard sander would be too bulky.

Here are the main areas where it excels:

• Automotive bodywork: touch-ups, preparation before painting, sanding localized areas
• Joinery and cabinetry: finishing on small parts, moldings, corners
• Yacht and composite industry: sanding hulls, gelcoat, laminates
• Renovation and building: sanding baseboards, frames, small surfaces
• Plastics and metallurgy: finishing on molded or machined parts

Compared to the DEROS II 550 (5 mm orbit, 125 mm pad), the 350 prioritizes precision and maneuverability rather than sanding throughput.

Model	Pad	Orbit	Main use
Mirka DEROS II 350	77 mm	3.5 mm	Precise finishing, small surfaces
Mirka DEROS II 550	125 mm	5 mm	Large surface sanding, bodywork
Festool ETSC 125	125 mm	5 mm	Wood and lacquer finishing, versatile use
Rupes LHR 75E	75 mm	3 mm	Polishing and finishing tight areas

At Dagobert Industrie, we recommend the DEROS II 350 to professionals who are looking for a high-end finishing tool for complex geometries or small parts.

FAQ - Mirka DEROS II 350 orbital sander

1. Which is the best Mirka orbital sander?

The answer depends on the usage. For precise finishing work on small surfaces, the DEROS II 350 is hard to beat: 77 mm pad, 3 mm orbit, fine control.

For large flat surfaces (bodywork, industrial joinery), the DEROS II 5650 with its 150 mm pad and 5 mm orbit will be more productive.

At Dagobert Industrie, we offer both references to cover all professional needs.

2. Who manufactures Mirka?

Mirka is a Finnish company founded in 1943, a subsidiary of the KWH Group. Its headquarters are in Jeppo, Finland.

Mirka is recognized worldwide for its dust-free abrasives and electronic sanders. The DEROS (Direct Electric Random Orbital Sander) range is manufactured in Europe with high-quality components.

The brand is a reference in the bodywork, joinery, industrial, and aeronautical sectors.

3. What is the difference between the DEROS II 350 and the DEROS II 5650?

Both machines share the same Mirka electronic technology, but their features are intended for distinct uses.

Feature	DEROS II 350	DEROS II 5650
Pad diameter	77 mm	150 mm
Orbit	3 mm	5 mm
Speed (rpm)	3,000-10,000	3,000-10,000
Main use	Finishing, tight areas	Large surfaces, stock removal
Weight	~0.9 kg	~1.1 kg
Ideal for	Touch-ups, fine cabinetry	Bodywork, panels

4. What is the best orbital sander for professional use?

For intensive professional use, you need a machine with electronic speed control, integrated dust extraction, and a brushless motor. The DEROS II 350 ticks all these boxes.

Compared to competitors like the Festool ETSC 125 or the Bosch GEX 125-150 AVE, the DEROS II 350 stands out for its very low weight and its particularly effective dust management thanks to the Mirka system.

For professionals working on finishing or complex parts, the DEROS II 350 remains one of the best choices on the market.