# 2018K Dunbier A1617GK Mackay 9-Leaf Slipper Spring Kit (Zinc Tech) | Marine Trailer Part

🔧 Product Description

  

Dunbier 9-Leaf Slipper Spring Suspension Kit - Part Number: 2018K

  

A complete display-packaged Dunbier suspension refresh kit for trailers using 9-leaf, 45mm-wide slipper springs. The matched pair of coated springs provides a published combined kit capacity of 1800kg.

  

⚙️ Key Features

  

• Complete matched spring replacement kit

• Two 9-leaf, 45mm-wide × approximately 780mm springs

• Dacromet or zinc-flake corrosion-resistant coating

• Square U-bolt mounting hardware

• Includes the principal hardware required for a complete spring replacement

  

📏 Specifications

  

• Leaf count: 9 per spring

• Spring width: 45mm

• Spring length: Approximately 780mm

• Published load rating: 1800kg per complete kit

• U-bolt style: square

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 2018K

• Mackay: A1617GK

• Individual spring: Dunbier 2018

• Kit contents commonly include 2 springs, 4 U-bolts with nuts, 2 fish plates and 2 shackle bolts

• Replacement bushes: Dunbier 2060C/2060D

  

🚤 Trailer Compatibility & Application

  

• Suits compatible Dunbier trailers using the specified 45mm slipper spring

• Check U-bolt dimensions against the axle beam before installation

• Kit capacity must not exceed the axle, wheel, tyre or trailer ratings

  

🔌 Function

  

Renews both sides of the axle suspension so spring rate, ride height and mounting hardware remain matched.

  

Common signs of wear or replacement:

  

• Existing springs are sagged, cracked or mismatched

• U-bolts are stretched or corroded

• Fish plates are bent

• Shackle bolts or bushes are worn

• Trailer ride height and tyre clearance have reduced

  

🛠️ Installation & Safety

  

• Support the chassis and axle independently

• Replace both springs and all supplied clamping hardware

• Confirm spring and U-bolt orientation before tightening

• Torque U-bolts evenly in stages

• Recheck suspension hardware after the first loaded trip

  

📦 Condition

  

• Brand new Dunbier Marine Products trailer component

• Supplied as one complete 9-leaf slipper spring kit

• Supplied in original or equivalent packaging

## Details

- **Price:** 295.2 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 295.20 AUD | In stock |

## Images

- 2018K Dunbier A1617GK Mackay 9-Leaf Slipper Spring Kit (Zinc Tech) | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/2018k-dunbier-9-leaf-slipper-spring-kit-zinc-tech-mackay-a1617gk)
> Updated: 2026-08-03