# A1686G Mackay 2023 Dunbier Large Spring Fish Plate Galvanised Suits 16mm U-Bolt | Marine Trailer Part

🔧 Product Description

  

Mackay Galvanised Spring Fish Plate for 65mm Axle - Part Number: A1686G

  

A galvanised axle fish plate used beneath the trailer spring to clamp a 65mm axle securely with the matching U-bolts. The formed plate spreads the U-bolt load across the spring pack and helps maintain the axle's location against the spring centre bolt.

  

⚙️ Key Features

  

• Designed for a 65mm axle

• Galvanised steel construction

• Matched U-bolt hole spacing

• Spreads axle-clamping load across the spring

• Replacement for bent, corroded or elongated fish plates

• Compatible with 16mm U-bolts

  

📏 Specifications

  

• Axle application: 65mm

• U-bolt application: 16mm U-bolts

• Material: Formed galvanised steel

• Spring width and hole spacing must match the installation

  

🔄 Cross Reference & Related Parts

  

• Mackay: A1686G

• Dunbier: 2023

• Designed for the corresponding 65mm axle and spring U-bolt spacing

• Use with new rated U-bolts, washers and locking nuts

• Other Mackay sizes: A1682G 40mm, A1684G 45mm, A1685G 50mm and A1686G 65mm

  

🚤 Trailer Compatibility & Application

  

• Suitable for Mackay/Dunbier suspension using the specified 65mm axle

• The plate must sit flat against the spring pack

• Not interchangeable with plates for different axle sizes or U-bolt centres

  

🔌 Function

  

Forms the lower clamping plate in the axle-to-spring connection, allowing the U-bolts to secure the axle without concentrating load on a small spring area.

  

Common signs of wear or replacement:

  

• Plate is bowed around the U-bolt holes

• Holes are elongated

• Galvanising is lost and corrosion is deep

• Axle moves on the spring

• U-bolt torque repeatedly falls

• Spring centre bolt no longer locates correctly

  

🛠️ Installation & Safety

  

• Replace U-bolts whenever the fish plate is changed

• Confirm the axle is centred over the spring centre bolt

• Tighten U-bolts progressively and evenly

• Do not use a plate with mismatched hole centres

• Recheck torque after initial loaded use

• Inspect axle alignment after installation

  

📦 Condition

  

• Genuine Mackay Trailers part

• Brand new

• Supplied as one galvanised fish plate for a 65mm axle

• Supplied in original or equivalent packaging

## Details

- **Price:** 24.5 AUD
- **Vendor:** Mackay
- **Tags:** Mackay Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 24.50 AUD | In stock |

## Images

- A1686G Mackay 2023 Dunbier Large Spring Fish Plate Galvanised Suits 16mm U-Bolt | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/a1686g-mackay-large-spring-fish-plate-galvanized-suits-16mm-ubolts-1-dunbier-2023)
> Updated: 2026-08-05