# A1369 Mackay 25mm Slotted Axle Nut | Marine Trailer Part

🔧 Product Description

  

Genuine Mackay Marine Trailer Products Heavy-Duty 25mm Slotted Axle Nut - Part Number: A1369

  

A slotted axle nut for compatible heavy-duty 25mm-thread trailer stub axles. The nut secures the hub and allows a split pin to lock the final bearing-preload position.

  

⚙️ Key Features

  

• Heavy-duty slotted/castellated axle-nut design

• Nominal 25mm thread application

• Provides positive split-pin locking

• Replacement for damaged or lost hub-retaining nuts

• Suitable for compatible heavy-duty trailer axles

  

📏 Specifications

  

• Nominal thread size: 25mm

• Thread pitch must match the axle stub

• Washer and split pin are supplied separately unless stated

  

🔄 Cross Reference & Related Parts

  

• Use with the matching axle washer and new split pin

• Smaller standard axle-nut kit: Mackay A1368

  

🚤 Compatibility & Application

  

• Compatible heavy-duty trailer stub axle with matching 25mm thread

• Set bearing preload before installing the split pin

• Do not use an impact wrench to set bearing adjustment

• Replace if slots or threads are damaged

  

🔌 Function

  

Retains the hub on the axle and locks the bearing adjustment using a split pin.

  

Common signs of wear, damage or replacement required:

  

• Threads are stripped or galled

• Nut slots are cracked or rounded

• Nut cannot be aligned without incorrect bearing preload

• Axle thread is damaged

• Split pin does not seat correctly

  

📦 Condition

  

• Genuine Mackay Marine Trailer Products part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 3.8 AUD
- **Vendor:** Mackay
- **Tags:** Mackay Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3.80 AUD | In stock |

## Images

- A1369 Mackay 25mm Slotted Axle Nut | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/a1369-mackay-25mm-slotted-axle-nut-1)
> Updated: 2026-08-05