H3325G Mackay 1000 Dunbier Electric Coupling Heavy-Duty 3500kg | Marine Trailer Part

🔧 Product Description

Genuine Mackay Marine Trailer Products Heavy-Duty 50mm Trailer Coupling for Electric-Braked Trailers – Part Number: H3325G

A heavy-duty fixed trailer coupling for 50mm tow balls and trailers with electrically actuated brakes. The coupling itself contains no electrical actuator; it provides the mechanical tow-ball connection while the trailer’s electric brake controller and brake assemblies operate separately.

⚙️ Key Features

• Rated coupling capacity of 3,500kg
• Designed for standard 50mm tow-ball connection
• Galvanised marine-trailer finish for improved corrosion resistance
• Adjustable ball-head mechanism helps minimise movement when correctly set
• Meets the applicable Australian trailer-coupling requirements when correctly installed

📏 Specifications

• Maximum coupling rating: 3,500kg
• Tow-ball size: 50mm
• Brake configuration: Fixed coupling for trailers using electric brakes
• Finish: Galvanised
• Mounting and fastener pattern must match the trailer drawbar and approved coupling plate

🔄 Cross Reference & Related Parts

• Mackay reference: H3325G
• Dunbier replacement adjustment bolt: 1011
• Comparable coupling category: 3,500kg fixed 50mm electric-brake trailer coupling complying with Australian requirements

🚤 Compatibility & Application

• Boat trailers and other trailers using electric drum or electric-over-hydraulic braking systems
• Total trailer ATM must not exceed the coupling, tow ball, towbar, vehicle or trailer manufacturer rating
• Confirm mounting-hole centres, drawbar structure and required high-tensile hardware before installation
• Not an override coupling and does not mechanically or hydraulically apply the trailer brakes

🔌 Function

Locks the trailer drawbar securely onto the tow vehicle’s 50mm tow ball and transfers towing and braking loads into the trailer drawbar.

⚠️ Common Signs of Failure

• Excessive movement or rattling around the tow ball
• Trigger does not latch positively
• Ball-head adjustment reaches its limit
• Bent coupling body or elongated mounting holes
• Severe corrosion, cracking or damaged safety-catch components

📦 Condition

• Genuine Mackay Marine Trailer Products part
• Brand new
• Supplied in original or equivalent packaging