# 3954-100B Dunbier Swing Drawbar Pin | Marine Trailer Part

🔧 Product Description

  

Dunbier Swing-Drawbar Replacement Pin - Part Number: 3954-100B

  

A pin-only replacement for the matching large/100mm swing-drawbar hinge. The hardened or heavy-section pin passes through the aligned hinge plates and locks the swing drawbar in its straight towing position.

  

⚙️ Key Features

  

• Replacement lock pin for Dunbier swing drawbar

• Removable service component

• Maintains hinge alignment

• Corrosion-resistant finish as supplied

• Pin only

  

📏 Specifications

  

• Application: Dunbier swing-drawbar hinge

• Pin diameter and usable length must match the hinge

• Retainer: not included

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 3954-100B

• DIY kits: Dunbier 3945 and 3946

• Use only the pin specified for the installed hinge

  

🚤 Trailer Compatibility & Application

  

• Suitable for the matching Dunbier swing-drawbar assembly

• A loose substitute bolt must not be used

• Hinge holes must remain round and correctly aligned

  

🔌 Function

  

Locks the folding drawbar rigidly in the towing position.

  

Common signs of wear or failure:

  

• Pin is bent or deeply scored

• Retaining clip is missing

• Holes are elongated

• Pin cannot be inserted fully

• Corrosion prevents removal

  

🛠️ Installation & Safety

  

• Support and align the drawbar before inserting the pin

• Fit the retaining clip completely

• Do not tow with a partially inserted pin

• Replace worn hinge plates as well as the pin

• Lubricate lightly with a non-grit-attracting corrosion protectant

  

📦 Condition

  

• Genuine Dunbier Marine Products part

• Brand new

• Supplied as one swing-drawbar pin

• Supplied in original or equivalent packaging

## Details

- **Price:** 64.0 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 64.00 AUD | In stock |

## Images

- 3954-100B Dunbier Swing Drawbar Pin | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3954-100b-swing-drawbar-pin)
> Updated: 2026-08-05