# 2199 Dunbier U-Bolt Square 41 x 55mm x 10mm Suits Alloy Trailers | Marine Trailer Part

🔧 Product Description

  

Genuine Dunbier Marine Products Galvanised Square U-Bolt 77 × 160 × 12mm - Part Number: 2199

  

A galvanised square U-bolt for clamping compatible trailer cross-members, drawbars, spring plates, brackets or accessory mounts. The nominal dimensions are 77mm inside width × 160mm leg length × 12mm rod diameter. The current Dunbier catalogue identifies part 2199 as approximately 77 × 160 × 12mm, rather than the duplicated smaller dimensions shown in some legacy listings.

  

⚙️ Key Features

  

• Square profile for the matching trailer tube or mounting section

• Galvanised finish for improved corrosion resistance in marine-trailer service

• 12mm threaded rod provides a robust clamping section

• Suitable for replacement of stretched, bent or heavily corroded original U-bolts

• Supply format: single U-bolt

  

📏 Specifications

  

• Inside width: 77mm

• Leg length: 160mm

• Rod diameter: 12mm

• Shape: Square

• Packaging: single U-bolt

• Nuts and washers are included only where stated with the supplied package

  

📋 Supplied Components

  

• 1 × U-bolt

  

🔄 Cross Reference & Related Parts

  

• Use with matching galvanised nuts, flat washers and spring or mounting plates

• Comparable U-bolts must match shape, inside width, leg length, rod diameter, thread and material grade

• Do not substitute an undersized or opened-out U-bolt to fit a larger trailer section

  

🚤 Compatibility & Application

  

• Alloy-trailer chassis, drawbar or mounting plate matching a 77mm inside width and 160mm leg length

• Measure the actual trailer section and mounting-plate hole centres before ordering

• Both legs must pass through the mounting plate without side loading or forced spreading

• Tighten the nuts evenly in stages to the trailer or component manufacturer specification

• Recheck torque after the first trip and during scheduled trailer servicing

  

🔌 Function

  

Clamps a trailer component securely around a structural section and transfers load through the mounting plate, bracket or spring assembly.

  

Common signs of wear, damage or replacement required:

  

• Threads are stretched, stripped, cross-threaded or heavily corroded

• U-bolt is bent, opened out or no longer square to the mounting plate

• Visible necking, cracking or loss of rod diameter

• Nuts repeatedly lose torque

• Mounting plate or trailer section moves under load

  

📦 Condition

  

• Genuine Dunbier Marine Products part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 12.0 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 12.00 AUD | In stock |

## Images

- 2199 Dunbier U-Bolt Square 41 x 55mm x 10mm Suits Alloy Trailers | Marine Trailer Part

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/2199-dunbier-ubolt-sq-41-x-55mm-x-10mm-suits-alloy-trailers)
> Updated: 2026-08-05