RMI 422
Compact and smart robotic mower with mulching function
General
If you want to mow a small to medium-sized lawn fully automatically, the STIHL RMI 422 iMOW® robotic mower is a practical solution. Its mulching mowing deck is powered by an integrated lithium-ion battery. During mulching, the lawn is only ever cut by a small amount, so that particularly fine grass clippings are uniformly introduced into the turf and the valuable nutrients benefit the soil again as fertiliser. This ensures a dense and healthy lawn. Using the multi-setting cutting height adjustment, your lawn is cut precisely to your desired height, thanks to the adaptive slope speed function even on uneven terrain with a gradient of up to 35 %. Its robust hood protects the iMOW® against obstacles and the weather. Integrated sensors detect contact with an object and initiate a change in the direction of the iMOW® robotic mower. The compact machine can be set up and organised in just a few steps via the control unit. Using the interactive mowing plan, the time window in which the automatic lawn mower can be operational can be specified for each day. Within these active times, the machine automatically determines the best times to mow for an optimum result. An installation kit is required for installation. The STIHL iMOW® robotic mowers comply with all applicable safety standards. Nevertheless, the iMOW® robotic mower is not a toy. During the iMOW® robotic mower's active times, in particular children, bystanders and animals must be kept out of the working area. Please refer to the operating instructions for further information.
Versions
Price-
RMI 422 Robotic mower€1,160.00*
* Manufacturer's recommended retail price updated as of 2021. The manufacturer's recommended retail prices are subject to change without notice.
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Technical data

Technical data
Technical data | Value |
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Sound power level LwA dB(A) 1) | 62 |
Working speed rpm | 4.450 |
Cutting height mm | 20-60 |
Mowing duration (average per week/h) h | 16 |
Uncertainty factor Sound pressure level KpA dB(A) | 2 |
Nominal output W | 60 |
Weight kg | 9 |
Measured sound power level LWA dB(A) | 60 |
Maximum gradient % | 35 |
Cutting width cm | 20 |
Maximum lawn area m² | 800 |
Measured sound pressure level LpA dB(A) | 49 |
1) Does not come under the Noise Emissions Guideline 2000/14/EC
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Features

Standard features
The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.
Accessories

Accessories
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AFN 075 fixing pins
The fixing pins are available as basic accessories for operating the STIHL iMOW® robotic mower. They are used to anchor the perimeter wire at the edge of the area to be mown by the STIHL iMOW®. One unit comprises 75 fixing pins.
Versions
Price- AFN 075 €20.00*
* Manufacturer's recommended retail price updated as of 2021. The manufacturer's recommended retail prices are subject to change without notice.
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ARB 501 perimeter wire
The perimeter wire defines the working area of the STIHL iMOW® robotic mower. The ARB 501 comprises 500 m on a coil. The wire is 3.4 mm thick is and suitable for installing the automatic lawn mower.
Versions
Price- ARB 501 €271.00*
* Manufacturer's recommended retail price updated as of 2021. The manufacturer's recommended retail prices are subject to change without notice.
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ADV 010 wire connectors
The wire connectors are available as basic accessories for operating the STIHL iMOW® robotic mower. They are used to join several perimeter wire segments. Each package contains 10 wire connectors.
Versions
Price- Satz Drahtverbinder - ADV 010 €22.00*
* Manufacturer's recommended retail price updated as of 2021. The manufacturer's recommended retail prices are subject to change without notice.
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AVS 100 front wheels
The heavy front wheels ensure that the STIHL iMOW® robotic mower can be used safely on especially hilly terrain. The change in weight distribution improves the automatic lawn mower's grip on inclined surfaces.
Versions
Price- Satz Vorderräder schwer - AVS 100 €70.00*
* Manufacturer's recommended retail price updated as of 2021. The manufacturer's recommended retail prices are subject to change without notice.
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The version(s) available in each country may differ from the above range and specifications; specific details may be subject to change without notice. Please ask your local STIHL Approved Dealer for further information.