# 2990B Dunbier Roller Pin Suits 4 1/2" Bulk | Marine Trailer Part

🔧 Product Description

  

Dunbier Bulk Roller Pin for 4-4.5" Rollers - Part Number: 2990B

  

A galvanised steel roller shaft sized for 4-inch and 4.5-inch 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: 16mm

• Approximate overall length: approximately 160mm

• Designed for 4-inch and 4.5-inch rollers

• Supply format: bulk individual

  

📏 Specifications

  

• Diameter: 16mm

• Length: approximately 160mm

• 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: 2990B

• 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 4-inch and 4.5-inch 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 bulk individual roller pin

• Supplied in original or equivalent packaging

## Details

- **Price:** 8.0 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 8.00 AUD | In stock |

## Images

- 2990B Dunbier Roller Pin Suits 4 1/2" Bulk | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/2990b-dunbier-roller-pin-to-suit-4-1-2-bulk)
> Updated: 2026-08-05