A1682G Mackay 2020 Dunbier Standard Spring Fish Plate (Galvanised) | Marine Trailer Part

🔧 Product Description

Mackay Galvanised Spring Fish Plate for 40mm Axle – Part Number: A1682G

A galvanised axle fish plate used beneath the trailer spring to clamp a 40mm 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 40mm axle
• Galvanised steel construction
• Matched U-bolt hole spacing
• Spreads axle-clamping load across the spring
• Replacement for bent, corroded or elongated fish plates
• Use with the correctly sized Mackay U-bolt set

📏 Specifications

• Axle application: 40mm
• U-bolt application: Match to the axle and spring assembly
• Material: Formed galvanised steel
• Spring width and hole spacing must match the installation

🔄 Cross Reference & Related Parts

• Mackay: A1682G
• Dunbier: 2020
• Designed for the corresponding 40mm 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 40mm 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 Failure

• 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 40mm axle
• Supplied in original or equivalent packaging