Description
Overview:
The Upper Ring Nut is a genuine Mountfield spare part for petrol brushcutters, including MB 2501 and MB 2502. Made from durable metal, it secures upper assembly components within the cutting/drive area, helping to keep parts tight under vibration and regular use. Correct fitment of this ring nut maintains alignment, reduces the risk of loosening, and supports smooth operation of the machine. Identified by OEM part number 3641650, it is a direct replacement for worn, damaged, or missing hardware on the listed models. Suitable for both professional users and homeowners, this part helps keep routine maintenance straightforward and effective, restoring the intended fastening and ensuring the brushcutter continues to perform as designed.
Key Features:
- Genuine Mountfield part for assured compatibility and quality
- OEM reference 3641650 for clear identification
- Strong metal construction to handle high vibration in service
- Accurate threading for a secure, repeatable fit
- Direct-fit replacement; no modification to the tool required
- Simple to install with common hand tools to minimise downtime
- Helps maintain correct alignment and stable cutting performance
- Suitable for professional and DIY maintenance schedules
Typical Applications:
Used during servicing and repairs of Mountfield brushcutters to replace a worn, stripped, or missing upper ring nut. Common when overhauling the head, gearbox, or clutch areas, after impact damage, or as part of seasonal maintenance. Suitable for workshops, landscapers, grounds teams, and home users who need reliable fastening of the cutting assembly.
Also known as:
Brushcutter ring nut, upper retaining nut, head ring nut, retaining ring nut, Mountfield ring nut, brushcutter nut.
Fits Models:
MB 2501, MB 2502, MB 28, MB 28D, MB 2901, MB 2902, MB 36D, MB 425, MB 4251, MB 4252, MB 425D, MT 4251, SB 28, SB 29, SB 29 DS, SB 29 S, SB 29D, SB 29S, SB 30, SB 425, SB 425 H, SB 425 HD, SB 426
Alternate Part Numbers:
3641650
Product Specifications
| L&S Part No. | GP3641650 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Mountfield |
| OEM No. | 3641650 |
| Unit of Sale | 1 |
| Machine Type | Brushcutters |
| Fits Brands | GGP |
| Key Features | - Genuine Mountfield part ensures compatibility with listed models - OEM reference 3641650 for easy identification - Durable metal construction withstands high vibration - Accurate threading provides secure, repeatable fit - Fits MB and SB series brushcutters without modification |
Reviews
Ask a Question
Compatibility
Customers also bought
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
Related Products
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
