Attwood Marine Square Bend U-Bolt Set, For Roller Brackets, 3-1/8 x 3 in, 7/16 in Diameter, Zinc-Plated Steel
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Overview
The Attwood Marine 11434-3 is a square-bend U-bolt set used on trailer roller brackets and bow stop assemblies. It uses 7/16 inch stock with a 3-1/8 inch inside width, a 3 inch inside height, and 2 inch threaded ends, so it fits hardware that needs that exact span, leg height, and thread length.
This is a discontinued part, which makes dimension matching more important before ordering. The zinc-plated steel build suits trailer hardware that sees launch ramps, road spray, vibration, and regular wet and dry cycles, and it comes with lock washers and nuts for the bracket assembly.
Key features
- Square-bend U-bolt set for roller bracket and bow stop hardware
- 3-1/8 inch inside width and 3 inch inside height for bracket setups that need that exact shape and span
- 7/16 inch stock with 2 inch threaded ends
- Zinc-plated steel construction
- Includes lock washers and nuts
- Useful when replacing bent, worn, or corroded roller bracket hardware without changing bracket dimensions
Compatibility and fit
Check the old U-bolt or the bracket opening before ordering. This part is meant for setups that use a square-bend profile rather than a round U-bolt, and it is commonly used where the bolt wraps around a flat-sided roller bracket.
The safest match points are the inside width, inside height, stock diameter, and thread length. If your current hardware uses a different span, a different leg length, or a different bolt diameter, the fit will not be correct even if the bracket looks similar at a glance.
Installation and setup
This type of hardware is usually replaced during bow stop or keel roller service on a trailer. Clean the bracket surfaces, check the bracket slots for wear, and inspect the roller bracket itself before reassembly so the new hardware is not being tightened against bent or worn metal.
After installation, it is worth checking the hardware again after the first few trips. Trailer roller assemblies deal with road shock, ramp use, and repeated vibration, so periodic inspection helps keep the bracket secure and the roller aligned where the boat meets the trailer.
Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.
Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.
Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.
Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.
Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.
Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.
To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.
We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.