Description
Overview:
This M8 Hex Nyloc Nut (MA503831) is a genuine Masport part for securing components on walk‐behind lawn mowers, including popular models such as the RR18 and 300AL. It is a steel hex nut with a nylon locking insert that grips the thread to resist loosening under vibration. That makes it well suited to the harsh, high‐vibration environment of mower chassis and driveline fixings. Built to Masport OEM specifications, it offers a reliable fit on M8 metric studs and bolts across a wide range of Masport pedestrian mowers. Use it to maintain safe, consistent clamping force on brackets, guards, handles, wheels, transmissions and other assemblies where a secure, serviceable fastening is required.
Key Features:
- Genuine Masport part for assured compatibility and fit
- Nyloc insert helps prevent back‐off from vibration and shock loads
- Durable steel construction for long service life in outdoor conditions
- Hex profile for straightforward tightening with a standard spanner or socket
- M8 metric thread suits common mower fixings across multiple Masport models
- Supports safe maintenance by maintaining consistent clamping force
- Suitable replacement for worn or missing lock nuts to restore reliability
Typical Applications:
Used wherever a secure, vibration‐resistant M8 fastening is needed on Masport mowers: chassis brackets, handle assemblies, wheel hardware, engine or transmission mounts, cable and guard fixings, and other service points. Ideal during routine servicing, repairs, or component replacements to maintain safe operation.
Also known as:
Nyloc nut, nylon‐insert lock nut, self‐locking nut, elastic stop nut, M8 lock nut, hex nyloc.
Fits Models:
150ST SP, 150ST SP L, 150STSP, 250ST SP, 250ST SP L, 250STSP, 300AL, 300AL L, 300ALL, 350ST SP, 350ST SP L, 350STSP, 400 16" (406 mm), 40016" (406 mm), 400ST, 450ST SP, 450STSP, 500 20" (508 mm), 500 20" Golf (508 mm), 500 AL, 50020" (508 mm), 500AL, 575AL, 575AL SP, 575ALSP, 600, 625AL, 660 24" (610 mm), 66024" (610 mm), 800AL, 800AL SP, 800AL SPV, 800ALSP, 800ST, 800ST SP, 800ST SPV, 800ST WC SP, 800STSP, Boxer, Contractor, Elite, Elite S18, Magnum, Maxicut, Maximus L, Oxford 48RS, Oxford 54RS, Prosmart SP, ROCKETL, RR18, RR18SP, RR18SP ES, RR18SP H, RR18SP IN, RR18SP L, RR18SPH, RR18SPL, RR21SP, RR21SP H, RR21SPH, RRSP22, Rocket L, Rocket SP, TITANIS, Titan, Titan IS
Alternate Part Numbers:
MA503831, MA-503831
Product Specifications
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
