H3325G Mackay 1000 Dunbier Electric Coupling Heavy-Duty 3500kg | Marine Trailer Part
H3325G Mackay 1000 Dunbier Electric Coupling Heavy-Duty 3500kg | Marine Trailer Part
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🔧 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
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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