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RM 4 RTP Petrol Mulching Lawn Mower
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 £75 +VAT
Easy Returns
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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 |
Delivery & Returns
Christmas Returns (Extended)
To give you extra peace of mind over Christmas:
- Orders placed between 10 October and 24 December 2025 can be returned up to 26 January 2026 (excluding Sale items)
- Orders placed from 25 December 2025 onwards are covered by our standard 30-day return policy
UK Delivery
Fast, reliable delivery from our UK warehouse.
- FREE UK Delivery on orders over £50 + VAT
Estimated delivery: 2–4 working days
- UK Standard Delivery from £3.60 + VAT
Estimated delivery: 2–4 working days
- Next Working Day Delivery – £5.00 + VAT
Order before 3:00pm (Monday–Friday) for next working day delivery
All UK orders are dispatched Monday–Friday and sent via a tracked courier service.
International Delivery
We ship worldwide from the UK.
- Europe from £10.00
Estimated delivery: 2–7 working days - Rest of the World from £12.00
Estimated delivery: 2–11 working days
Shipping costs and delivery times are calculated at checkout based on destination and order contents.
Customs, Duties & Taxes
International orders may be subject to local import duties, taxes, or customs charges.
When UPS is selected at checkout, applicable duties and taxes are included in the total price. For other shipping services, duties and taxes may be charged separately on delivery and are the responsibility of the recipient.
Customs processing times may affect delivery estimates.
Returns
30-Day Return Policy
- Items can be returned within 30 days of delivery
- Products must be unused and in original condition
- Return postage costs apply unless the item is faulty or incorrect
For full details, please visit our Shipping & Returns page.
Christmas Returns (Extended)
To give you extra peace of mind over Christmas:
- Orders placed between 10 October and 24 December 2025 can be returned up to 26 January 2026 (excluding Sale items)
- Orders placed from 25 December 2025 onwards are covered by our standard 30-day return policy
UK Delivery
Fast, reliable delivery from our UK warehouse.
- FREE UK Delivery on orders over £50 + VAT
Estimated delivery: 2–4 working days
- UK Standard Delivery from £3.60 + VAT
Estimated delivery: 2–4 working days
- Next Working Day Delivery – £5.00 + VAT
Order before 3:00pm (Monday–Friday) for next working day delivery
All UK orders are dispatched Monday–Friday and sent via a tracked courier service.
International Delivery
We ship worldwide from the UK.
- Europe from £10.00
Estimated delivery: 2–7 working days - Rest of the World from £12.00
Estimated delivery: 2–11 working days
Shipping costs and delivery times are calculated at checkout based on destination and order contents.
Customs, Duties & Taxes
International orders may be subject to local import duties, taxes, or customs charges.
When UPS is selected at checkout, applicable duties and taxes are included in the total price. For other shipping services, duties and taxes may be charged separately on delivery and are the responsibility of the recipient.
Customs processing times may affect delivery estimates.
Returns
30-Day Return Policy
- Items can be returned within 30 days of delivery
- Products must be unused and in original condition
- Return postage costs apply unless the item is faulty or incorrect
For full details, please visit our Shipping & Returns page.