A1609G Mackay 2015 Dunbier 5 Leaf Slipper Spring (Zinc Tech) | Marine Trailer Part

🔧 Product Description

Mackay 5-Leaf Zinc-Tech Slipper Spring – 600kg per Spring – Part Number: A1609G

A 5-leaf, 45mm-wide slipper spring for Mackay and corresponding Dunbier single-axle or non-load-sharing suspension systems. The Zinc-Tech/Dacromet-style protective coating provides improved corrosion resistance over untreated spring steel, while the progressively stacked leaves support the trailer load and absorb road shock. Current Mackay catalogue data rates this spring at 600kg per spring.

⚙️ Key Features

• 5-leaf spring pack
• 45mm spring width
• Published load rating: 600kg per spring
• One-eye and slipper-tail suspension design
• Zinc-Tech/Dacromet-style corrosion-resistant finish
• Purpose-built for marine trailer suspension service

📏 Specifications

• Leaf count: 5
• Spring width: 45mm
• Load rating: 600kg per spring
• Indicative paired capacity: 1200kg before allowing for trailer design, axle and legal limits
• Spring length, camber and eye dimensions must match the original installation

🔄 Cross Reference & Related Parts

• Mackay: A1609G
• Dunbier: 2015
• Complete paired spring kit: Mackay A1609GK
• Standard front hanger: Mackay A1662N
• Standard rear hanger: Mackay A1664N
• Standard galvanised fish plate: Mackay A1682G for the applicable 40mm axle
• Comparable replacement must match leaf count, width, free length, camber, eye/bush size and load rating

🚤 Trailer Compatibility & Application

• Suitable for Mackay and Dunbier trailers using the matching 45mm slipper-spring geometry
• Use as a matched pair on the same axle
• Trailer ATM is limited by the lowest-rated axle, springs, hubs, tyres, chassis and braking components

🔌 Function

Carries the trailer body and axle load while flexing over road irregularities, controlling axle movement through the fixed front eye and sliding rear slipper.

⚠️ Common Signs of Failure

• Trailer sits lower on one side
• Individual leaves are cracked, separated or shifted
• Spring has lost its original camber
• Eye bush is worn or the front bolt hole is elongated
• Deep corrosion, pitting or fretting is visible between leaves
• Tyres contact guards because the spring pack has sagged

🛠️ Installation & Safety

• Replace springs in matched axle pairs
• Support the trailer frame securely before removing U-bolts or spring bolts
• Use new correctly sized U-bolts, fish plates and locking nuts
• Do not reuse U-bolts that have stretched, corroded or damaged threads
• Tighten suspension hardware with the trailer at the specified ride height
• Recheck U-bolt torque and wheel alignment after initial road use

📦 Condition

• Genuine Mackay Trailers part
• Brand new
• Supplied as one 5-leaf slipper spring
• Supplied in original or equivalent packaging