521633 - Main transmission nut by Land RoverTransmission or Drivetrain Part Land Rover Range Rover Series

521633 - Mainshaft Nut – Castellated

- €9,90

€9,90

€9,90 - €9,90

€9,90

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Genuine: Original manufacturer part. This product is the original part designed and produced by the vehicle manufacturer.

Mainshaft Nut - castellated nut that retains the assembled components on the rear of the gearbox mainshaft. The castellations accept a split pin to lock the nut against loosening.

This is the heavy-duty (1-Ton) specification nut, which also serves as an optional alternate to the standard mainshaft nut. It is fitted with its companion locking tab washer (part 521634).

Vehicle Model Land Rover Series 1
Land Rover Series 2 and 3

Fitment Notes Fitment data limited — derived from web research, verify if uncertain
SERIES I/II/IIA/III — castellated rear mainshaft (transmission) nut; notably 109 1 Ton, used as alternative across Series models

Alternative Codes

521633

In stock 5 units

5 · Gouda 0 · Drachten

Express delivery available

When will my order arrive?

Order before 15:00 (Mon–Fri): same-day dispatch for in-stock items.
UPS Express (order before 14:00): dispatched today, delivered tomorrow where available.
Netherlands / Belgium / Germany: 2–4 working days.
Other EU countries + UK: 4–8 working days.
Outside EU/UK: delivery times vary — contact us for an estimate.

Items may ship from multiple warehouses at no extra cost.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the castellated Mainshaft Nut used for?

The castellated Mainshaft Nut retains the assembled components on the rear of the gearbox mainshaft. Its castellations accept a split pin, which locks the nut so it can't loosen in service. This is the heavy-duty 1-Ton specification nut.

Which Land Rover models does this castellated Mainshaft Nut fit?

Typically this castellated Mainshaft Nut fits Land Rover Series 1, 2, 2A and 3 gearboxes, including the 109 1-Ton, where it's used as an alternative rear mainshaft nut. Fitment data here is limited, so verify against your gearbox before ordering.

Does the Mainshaft Nut need a new split pin when refitted?

Yes, fit a new split pin whenever the castellated Mainshaft Nut is refitted. The split pin is single-use and locks the nut against loosening. Tighten the nut to the workshop manual specification, then align the castellations and fit a fresh pin.