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RM 4 RTP Petrol Mulching Lawnmower
SKU: Stihl | RM-6383 011 3422
- Regular price
- £650.96 Ex VAT
- £781.15 Inc VAT
- RRP: £765.83 Ex VAT
- Sale price
- £650.96 £650.96 Ex VAT
- Regular price
-
- £781.15 £781.15 Inc VAT
- Was £765.83 Ex VAT
Free Standard UK Delivery Over £50 +VAT
Easy Returns
STIHL Approved Dealer
As a STIHL Approved Dealer, we supply genuine UK-spec machines with full manufacturer warranty, professional preparation, and expert aftersales support.
Product information & specifications
STIHL RM 4 RTP Petrol Mulching Lawn Mower – 53 cm / 21″ Cut-Width
Professional-grade self-propelled petrol mulching mower designed for large lawns and demanding use.
The STIHL RM 4 RTP is engineered for serious lawn care – with a 53 cm (21″) cutting width, high-performance engine and mulching capability so grass clippings are finely shredded and returned to the turf as natural fertiliser. Ideal for large domestic gardens, estates or demanding outdoor spaces.
Key Features & Benefits
- 53 cm / 21″ cutting width: Covers large areas efficiently.
- Mulching blade and function: Shreds grass into fine particles to act as natural fertiliser.
- Self-propelled drive system: Makes mowing large areas or slopes easier and less tiring.
- Aluminium deck & heavy-duty build: Designed for durability with components like large wheels, aluminium rims and reinforced construction.
- Cut height range 30-70 mm: Versatile for lawn maintenance to longer lengths.
- Ideal for areas up to ~2,500 m²: Suitable for large gardens or estates.
- 5-year domestic warranty (when registered): Gives long-term peace of mind (subject to registration & servicing).
Technical Specifications
| Specification | Detail |
|---|---|
| Cutting Width | 53 cm / 21″ |
| Cutting Height Range | 30-70 mm |
| Engine Displacement | 173 cm³ |
| Weight | ≈ 44 kg |
| Maximum Lawn Area | Up to ~2,500 m² |
| Sound Power Level | ≈ 93 dB(A) |
Why Choose the RM 4 RTP?
When you’re looking for a high-spec petrol mulching mower that will handle large gardens, frequent use or estate-type settings, the RM 4 RTP stands out. With its large cut width, self-drive, premium build and mulching capability, it’s engineered to deliver a professional finish and long service life. Choose this model if you want serious performance and durability rather than basic lawn care.
| Max. Lawn area | up to 2500 m² |
| Cutting width | 53 cm |
| Cutting height | 30 - 70 mm |
| Device width | 57 cm |
| Device height | 108 |
| Front wheel diameter | 210 mm |
| Rear wheel diameter | 205 mm |
| Drive | 4,6 km/h |
| Motor type | Serie HD775 OHV SC |
| Displacement | 173 cm³ |
| Rated speed of sweeping attachment | 2800 rpm |
| Device weight | 44 kg |
| Sound power level, guaranteed LWA | 93 dB(A) |
| Measured sound pressure level LpA | 79 dB(A) |
| Uncertainty factor, sound pressure level KpA | 2 dB(A) |
| Vibration, guide bar, ahw | 2.4 m/s² |
| Vibration uncertainty K | 1.2 m/s² |
| CO2 | 725 g/kWh |
STIHL RM 4 RTP Petrol Mulching Lawn Mower – 53 cm / 21″ Cut-Width
Professional-grade self-propelled petrol mulching mower designed for large lawns and demanding use.
The STIHL RM 4 RTP is engineered for serious lawn care – with a 53 cm (21″) cutting width, high-performance engine and mulching capability so grass clippings are finely shredded and returned to the turf as natural fertiliser. Ideal for large domestic gardens, estates or demanding outdoor spaces.
Key Features & Benefits
- 53 cm / 21″ cutting width: Covers large areas efficiently.
- Mulching blade and function: Shreds grass into fine particles to act as natural fertiliser.
- Self-propelled drive system: Makes mowing large areas or slopes easier and less tiring.
- Aluminium deck & heavy-duty build: Designed for durability with components like large wheels, aluminium rims and reinforced construction.
- Cut height range 30-70 mm: Versatile for lawn maintenance to longer lengths.
- Ideal for areas up to ~2,500 m²: Suitable for large gardens or estates.
- 5-year domestic warranty (when registered): Gives long-term peace of mind (subject to registration & servicing).
Technical Specifications
| Specification | Detail |
|---|---|
| Cutting Width | 53 cm / 21″ |
| Cutting Height Range | 30-70 mm |
| Engine Displacement | 173 cm³ |
| Weight | ≈ 44 kg |
| Maximum Lawn Area | Up to ~2,500 m² |
| Sound Power Level | ≈ 93 dB(A) |
Why Choose the RM 4 RTP?
When you’re looking for a high-spec petrol mulching mower that will handle large gardens, frequent use or estate-type settings, the RM 4 RTP stands out. With its large cut width, self-drive, premium build and mulching capability, it’s engineered to deliver a professional finish and long service life. Choose this model if you want serious performance and durability rather than basic lawn care.
| Max. Lawn area | up to 2500 m² |
| Cutting width | 53 cm |
| Cutting height | 30 - 70 mm |
| Device width | 57 cm |
| Device height | 108 |
| Front wheel diameter | 210 mm |
| Rear wheel diameter | 205 mm |
| Drive | 4,6 km/h |
| Motor type | Serie HD775 OHV SC |
| Displacement | 173 cm³ |
| Rated speed of sweeping attachment | 2800 rpm |
| Device weight | 44 kg |
| Sound power level, guaranteed LWA | 93 dB(A) |
| Measured sound pressure level LpA | 79 dB(A) |
| Uncertainty factor, sound pressure level KpA | 2 dB(A) |
| Vibration, guide bar, ahw | 2.4 m/s² |
| Vibration uncertainty K | 1.2 m/s² |
| CO2 | 725 g/kWh |
STIHL Warranty
STIHL offer a 1 year professional warranty or 2 year domestic warranty with all of their machines.
The following exceptions apply:
- AK System, AS System and AI Line cordless products aren't covered under warranty when used by professionals
- AP System machines, batteries and chargers - 2 year professional warranty
- Pressure washers - 2 year professional warranty or 3 year domestic warranty
- Mowers, tillers, shredders, scarifiers & iMOW machines - See STIHL's website here
Extend your Stihl warranty by an additional year when purchasing a STIHL Smart Connector with selected machinery from the petrol and cordless range. Extends your petrol warranty from 1 to 2 years AND 2 to 3 years on select cordless tools.
STIHL offer a 1 year professional warranty or 2 year domestic warranty with all of their machines.
The following exceptions apply:
- AK System, AS System and AI Line cordless products aren't covered under warranty when used by professionals
- AP System machines, batteries and chargers - 2 year professional warranty
- Pressure washers - 2 year professional warranty or 3 year domestic warranty
- Mowers, tillers, shredders, scarifiers & iMOW machines - See STIHL's website here
Extend your Stihl warranty by an additional year when purchasing a STIHL Smart Connector with selected machinery from the petrol and cordless range. Extends your petrol warranty from 1 to 2 years AND 2 to 3 years on select cordless tools.
Delivery & Returns
UK Standard Delivery from - £3.60
Estimated delivery 2-4 days
Free Delivery available for orders above £75+ VAT
Estimated delivery 2-4 days
Next Day Delivery - £7.99
Estimated delivery 1 day when ordered before 3PM Monday - Friday
International Delivery Europe from - £10.00
Estimated delivery 2-7 days
International Delivery Rest of the World from - £12.00
Estimated delivery 2-11 days
Returns
30-Day Return Policy
For more information on shipping options, visit our shipping page here.
UK Standard Delivery from - £3.60
Estimated delivery 2-4 days
Free Delivery available for orders above £75+ VAT
Estimated delivery 2-4 days
Next Day Delivery - £7.99
Estimated delivery 1 day when ordered before 3PM Monday - Friday
International Delivery Europe from - £10.00
Estimated delivery 2-7 days
International Delivery Rest of the World from - £12.00
Estimated delivery 2-11 days
Returns
30-Day Return Policy
For more information on shipping options, visit our shipping page here.