1011 Dunbier Coupling Adjustment Bolt | Marine Trailer Part
1011 Dunbier Coupling Adjustment Bolt | Marine Trailer Part
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✓ Authorised Volvo Penta Dealer · Marine & auto specialists · Ships Australia-wide
🔧 Product Description
Dunbier Coupling Ball-Head Adjustment Bolt – Part Number: 1011
A replacement adjustment bolt for selected Dunbier standard and heavy-duty 50mm couplings. The bolt sets the internal ball-socket clearance, allowing normal tow-ball and coupling wear to be compensated within the manufacturer's adjustment range.
⚙️ Key Features
- Replacement threaded ball-head adjuster
- Restores correct coupling-to-ball clearance
- Suitable for selected fixed and override couplings
- Allows controlled adjustment without replacing a serviceable coupling body
- Includes only the components supplied in the current package
📏 Specifications
- Component type: Coupling adjustment bolt
- Thread and head profile must match the existing coupling
- Adjustment range is limited by coupling-body and socket wear
🔄 Cross Reference & Related Parts
- Dunbier: 1011
- Used with Dunbier 1010 standard coupling
- Used with Dunbier 1000 heavy-duty coupling
- Used with selected Dunbier 1041 and 1032 override couplings
- Comparable replacement: Coupling-specific coarse-thread adjustment bolt and nut with matching dimensions
🚤 Trailer Compatibility & Application
- Suitable only where the coupling body provides the matching threaded adjustment point
- Will not repair a cracked, stretched or severely worn ball socket
- Confirm the original thread before installation
🔌 Function
Sets the internal coupling socket clearance around the tow ball to reduce excessive play while allowing unrestricted articulation.
⚠️ Common Signs of Failure
- Bolt thread is stripped or seized
- Adjustment cannot remove excessive ball movement
- Lock nut repeatedly loosens
- Bolt head or contact end is deformed
- Coupling becomes tight in turns after incorrect adjustment
🛠️ Installation & Safety
- Clean and inspect the coupling before adjustment
- Connect the coupling to a correct unworn 50mm tow ball while setting clearance
- Tighten the lock nut after adjustment
- Check free articulation through the full towing angle
- Replace the complete coupling if safe adjustment cannot be achieved
📦 Condition
- Brand new Dunbier Marine Products trailer component
- Supplied as one coupling adjustment bolt assembly
- 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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