# 1489 Dunbier A1378C-5 Mackay Pack of 5 Wheel Alloy Long Wheel Nuts (Dacromet Finish) Not Chrome | Marine Trailer Part

🔧 Product Description

  

Genuine Dunbier Marine Products Dacromet-Coated Long Alloy-Wheel Nut - Pack of 5 - Part Number: 1489

  

A long-profile wheel nut for compatible Dunbier alloy trailer wheels. The Dacromet-coated finish provides corrosion protection for marine use and is intentionally different from decorative chrome plating.

  

⚙️ Key Features

  

• Long-body profile suited to compatible alloy-wheel recesses

• Dacromet corrosion-resistant finish

• Designed for trailer wheel-stud service

• Suitable for replacement of damaged or incorrect alloy-wheel nuts

• Supplied as a five-nut pack

  

📏 Specifications

  

• Thread size: Commonly 1/2-inch UNF in the Dunbier alloy-wheel range; verify the wheel stud

• Nut style: Long alloy-wheel nut

• Finish: Dacromet coated, not chrome

• Pack quantity: 5

• Seat profile must match the wheel's machined nut seat

  

📋 Supplied Components

  

• 5 × Dacromet-coated long alloy-wheel nuts

  

🔄 Cross Reference & Related Parts

  

• Mackay reference: A1378C-5

• Individual replacement: Dunbier 1489B

  

🚤 Compatibility & Application

  

• Compatible Dunbier alloy wheels using the same stud thread and nut-seat geometry

• Do not use a tapered nut on a flat-seat wheel or a flat-seat nut on a tapered wheel

• Thread engagement must be adequate and the nut must not bottom before clamping the wheel

• Tighten in a cross pattern to the hub or trailer manufacturer torque

• Recheck torque after the initial short trip and after wheel removal

  

🔌 Function

  

Clamps the alloy wheel securely against the trailer hub and transfers wheel loads into the studs.

  

Common signs of wear, damage or replacement required:

  

• Threads are stretched, stripped or cross-threaded

• Seat is galled, cracked or deformed

• Nut repeatedly loses torque

• Dacromet coating is damaged and severe corrosion develops

• Hex flats are rounded

  

📦 Condition

  

• Genuine Dunbier Marine Products part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 17.1 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 17.10 AUD | In stock |

## Images

- 1489 Dunbier A1378C-5 Mackay Pack of 5 Wheel Alloy Long Wheel Nuts (Dacromet Finish) Not Chrome | Marine Trailer Part
- 1489 Dunbier A1378C-5 Mackay Pack of 5 Wheel Alloy Long Wheel Nuts (Dacromet Finish) Not Chrome | Marine Trailer Part
- 1489 Dunbier A1378C-5 Mackay Pack of 5 Wheel Alloy Long Wheel Nuts (Dacromet Finish) Not Chrome | Marine Trailer Part
- 1489 Dunbier A1378C-5 Mackay Pack of 5 Wheel Alloy Long Wheel Nuts (Dacromet Finish) Not Chrome | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/1489-dunbier-pack-of-5-wheel-alloy-long-wheel-nuts-dacromat-finish-not-chrome-mackay-a1378c-5)
> Updated: 2026-08-03