# 3040 Dunbier Roller Pin 24.5mm Suits 12" Roller | Marine Trailer Part

🔧 Product Description

  

Dunbier Heavy Roller Pin for 12" Rollers - Part Number: 3040

  

A galvanised steel roller shaft sized for 12-inch rubber or soft-poly dogbone/parallel rollers. The pin passes through the trailer bracket and roller bore, providing the axle on which the roller turns.

  

⚙️ Key Features

  

• Galvanised steel construction

• Nominal pin diameter: 24.5mm

• Approximate overall length: approximately 360mm

• Designed for 12-inch rubber or soft-poly dogbone/parallel rollers

• Supply format: individual

  

📏 Specifications

  

• Diameter: 24.5mm

• Length: approximately 360mm

• Retention hardware may include washers, split pins, R-clips or nuts depending on the installed bracket

• Measure bracket outside width and roller bore before ordering

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 3040

• Roller and bracket are sold separately unless specifically packaged together

• Use only a pin whose diameter and usable length match the assembly

  

🚤 Trailer Compatibility & Application

  

• Suitable for 12-inch rubber or soft-poly dogbone/parallel rollers

• Not interchangeable with a smaller or larger pin merely because the roller length is similar

• Bracket holes must remain round and aligned

  

🔌 Function

  

Forms the rotating shaft for the trailer roller and transfers hull load into the roller bracket.

  

Common signs of wear or replacement:

  

• Pin is bent, deeply grooved or worn undersize

• Galvanising is lost and heavy corrosion is present

• Retaining holes or threads are damaged

• Roller binds because the pin is distorted

• Bracket holes have worn into the pin

  

🛠️ Installation & Safety

  

• Support the boat before removing a load-bearing pin

• Replace worn washers and retaining hardware

• Fit the pin squarely through aligned bracket holes

• Confirm the roller turns freely

• Secure both ends using the original retention method

  

📦 Condition

  

• Brand new Dunbier Marine Products trailer component

• Supplied as one individual roller pin

• Supplied in original or equivalent packaging

## Details

- **Price:** 28.5 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 28.50 AUD | In stock |

## Images

- 3040 Dunbier Roller Pin 24.5mm Suits 12" Roller | Marine Trailer Part
- 3040 Dunbier Roller Pin 24.5mm Suits 12" Roller | Marine Trailer Part
- 3040 Dunbier Roller Pin 24.5mm Suits 12" Roller | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3040-dunbier-roller-pin-24-5mm-to-suit-12-roller)
> Updated: 2026-08-05