# 3139G Dunbier Weld-On Frame U Bracket Mount (Galvanived Metal Finish) | Marine Trailer Part

🔧 Product Description

  

Genuine Dunbier Marine Products Weld-On Galvanised Frame U-Bracket - Part Number: 3139G

  

A galvanised weld-on frame U-bracket for attaching a 20mm square leg roller, pad or support leg to a compatible trailer frame. The bracket provides a pivoting or clamped connection using the supplied half-inch fastener arrangement.

  

⚙️ Key Features

  

• Weld-on mounting configuration

• Galvanised finish

• Accepts a 20mm square leg support leg

• Replaceable trailer-support mounting component

• Supply format: bracket with 1/2-inch bolt and nut

  

📏 Specifications

  

• Leg size: 20mm square leg

• Pivot/retaining fastener: 1/2-inch bolt and nut

• Installation type: Weld-on

• Surface finish: Galvanised

  

📋 Supplied Components

  

• bracket with 1/2-inch bolt and nut

  

🔄 Cross Reference & Related Parts

  

• Raw weld-on version: Dunbier 3139

• Bolt-on version: Dunbier 3138B

  

🚤 Compatibility & Application

  

• Compatible Dunbier roller, pad or support legs matching the stated section

• Weld-on versions must be installed by a competent welder

• Protect raw metal after welding with a suitable marine corrosion-control system

• Bolt-on versions require correct frame width, backing and fastener torque

  

🔌 Function

  

Secures a support leg to the trailer frame while providing the required fixed or pivoting connection.

  

Common signs of wear, damage or replacement required:

  

• Bracket is cracked, bent or distorted

• Bolt hole is elongated

• Weld is cracked or corroded

• Support leg has excessive movement

• Retaining bolt or nut is damaged

  

📦 Condition

  

• Genuine Dunbier Marine Products part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 8.5 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 8.50 AUD | In stock |

## Images

- 3139G Dunbier Weld-On Frame U Bracket Mount (Galvanived Metal Finish) | Marine Trailer Part
- 3139G Dunbier Weld-On Frame U Bracket Mount (Galvanived Metal Finish) | Marine Trailer Part
- 3139G Dunbier Weld-On Frame U Bracket Mount (Galvanived Metal Finish) | Marine Trailer Part
- 3139G Dunbier Weld-On Frame U Bracket Mount (Galvanived Metal Finish) | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3139g-dunbier-weld-on-frame-u-bracket-mount-galvanived-metal-finish)
> Updated: 2026-08-05