# 3151 Dunbier Hard Poly 6" Roller and "Big Mouth" Bracket | Marine Trailer Part

🔧 Product Description

  

Genuine Dunbier Marine Products Hard-Poly Roller and Big-Mouth Bracket 6" - Part Number: 3151

  

A galvanised wide-opening big mouth bracket fitted with 1 6-inch hard polyurethane roller. The assembly supports and guides the boat hull during launch and retrieval. The wider bracket opening provides additional clearance for compatible keel or hull shapes.

  

⚙️ Key Features

  

• Hard polyurethane roller construction

• 1-roller wide-opening big mouth bracket

• Galvanised marine-trailer bracket

• Roller rotates to reduce hull drag during loading

• Suitable for replacement or trailer-support adjustment

  

📏 Specifications

  

• Nominal roller size: 6-inch

• Roller quantity: 1

• Roller material/colour: Hard polyurethane

• Leg length: Follow supplied bracket configuration

• Supply: complete roller and bracket assembly

  

🔄 Cross Reference & Related Parts

  

• Standard hard-poly assembly: Dunbier 3152

  

🚤 Compatibility & Application

  

• Compatible Dunbier trailer roller stations matching the bracket width, leg spacing and roller shaft size

• Position rollers under structurally supported hull areas

• Set neighbouring rollers to share the hull load rather than creating isolated pressure points

• Confirm the assembly clears strakes, chines, transducers and hull fittings

• Use the correct roller shaft, washers and retaining clips

  

🔌 Function

  

Supports the hull and allows it to roll across the trailer with reduced friction while helping maintain centreline alignment.

  

Common signs of wear, damage or replacement required:

  

• Roller is cracked, worn flat, swollen or seized

• Bracket or legs are bent

• Roller shaft or holes develop excessive play

• Retaining hardware is missing

• Hull contacts the metal bracket

  

📦 Condition

  

• Genuine Dunbier Marine Products part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 122.5 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 122.50 AUD | In stock |

## Images

- 3151 Dunbier Hard Poly 6" Roller and "Big Mouth" Bracket | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3151-hard-poly-6-roller-big-mouth-bracket)
> Updated: 2026-08-05