A1613GK Mackay 2017K Dunbier 7 Leaf Slipper Spring Kit (Zinc Tech) | Marine Trailer Part

🔧 Product Description

Mackay 7-Leaf Zinc-Tech Slipper Spring Installation Kit – Part Number: A1613GK

A boxed suspension service kit for replacing both 7-leaf, 45mm-wide Mackay slipper springs on one axle. The kit combines two matched Zinc-Tech/Dacromet-coated spring assemblies with the primary axle-clamping and front-pivot hardware required for a complete paired spring change. Each spring is rated at 750kg, giving an indicative combined spring capacity of 1500kg before the lower ratings of the trailer, axle, tyres and other components are considered.

⚙️ Key Features

• Two matched 7-leaf slipper springs
• 45mm spring width
• 750kg published rating per spring
• Corrosion-resistant Zinc-Tech/Dacromet-style coating
• Boxed single-axle suspension replacement package
• Includes matched axle-clamping and spring-bolt hardware

📏 Specifications

• Leaf count: 7 per spring
• Spring width: 45mm
• Combined spring rating: 1500kg
• Kit contents: 2 springs, 4 U-bolts, 2 fish plates and 2 shackle/spring bolts
• U-bolt dimensions and fish-plate axle size are those supplied with the current kit

🔄 Cross Reference & Related Parts

• Mackay: A1613GK
• Dunbier: 2017K
• Individual spring: Mackay A1613G
• Replacement hangers: Mackay A1662N front and A1664N rear
• Comparable kits must match the spring geometry and axle section—not only leaf count

🚤 Trailer Compatibility & Application

• Suitable for servicing one axle using the corresponding Mackay/Dunbier slipper-spring family
• The included U-bolts and fish plates must match the axle diameter or square section
• Use only where the spring length, eye and slipper position match the trailer
• The kit does not increase the trailer's certified ATM

🔌 Function

Restores the complete paired spring support and axle-clamping hardware on one trailer axle.

⚠️ Common Signs of Failure

• Both springs have sagged or lost equal ride height
• Leaf cracks or corrosion are present
• U-bolts have stretched or loosen repeatedly
• Fish plates are bent
• Spring-eye bushes or pivot bolts are worn
• Axle alignment changes under braking or cornering

🛠️ Installation & Safety

• Replace both sides of the axle together
• Measure the axle and compare all supplied U-bolts before dismantling
• Support both the frame and axle securely
• Clean the axle seating surface and align the spring centre bolts correctly
• Tighten U-bolts progressively in a cross pattern
• Recheck torque and alignment after the first loaded trip

📦 Condition

• Genuine Mackay Trailers part
• Brand new
• Supplied as one boxed 7-leaf slipper spring kit for one axle
• Supplied in original or equivalent packaging