H3781G-2 Mackay 50mm Square x 170mm x 16mm Galvanised.U-Bolt Pack of 2 | Marine Trailer Part
H3781G-2 Mackay 50mm Square x 170mm x 16mm Galvanised.U-Bolt Pack of 2 | Marine Trailer Part
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✓ Authorised Volvo Penta Dealer · Marine & auto specialists · Ships Australia-wide
🔧 Product Description
Mackay Galvanised Square U-Bolt 50 × 170 × 16mm – Part Number: H3781G-2
A galvanised square-form U-bolt for clamping compatible Mackay trailer brackets or frame hardware around a nominal 50mm section.
⚙️ Key Features
- Square form
- Nominal section: 50mm
- Nominal leg: 170mm
- Thread: M16
- Galvanised finish
- Quantity: 2
- Hardware separate unless present
📏 Specifications
- Legacy/special reference: verify actual inside width and thread
- Supplied nominal: 50 × 170 × 16mm
- Pack quantity: 2
- Measure before fitting
🔄 Cross Reference & Related Parts
- Mackay: H3781G-2
- Bulk reference: H3781G
🚤 Trailer Compatibility & Application
- Use on exact section size
- Legs must remain parallel
- Full nut engagement required
- Not for lifting
🔌 Function
Clamps a bracket or component around an axle, frame or support section.
⚠️ Common Signs of Failure
- Stretched thread
- Bent legs
- Loose nuts
- Bracket movement
- Pitting
- Uneven loading
🛠️ Installation & Safety
- Confirm dimensions
- Do not reuse critical U-bolts
- Tighten evenly
- Use locking hardware
- Do not force fit
- Recheck torque
📦 Condition
- Genuine Mackay Trailers part
- Brand new
- Supplied as one pack of 2 U-bolts
- 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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