# 3957 Dunbier Over-Boat Ratchet Tie-Down 5.5m | Marine Trailer Part

🔧 Product Description

  

Dunbier Heavy-Duty Over-Boat Ratchet Tie-Down 50mm × 5.5m - Part Number: 3957

  

A Dunbier trailer tie-down using 50mm webbing and a 5.5m working length. The over-boat hooks connect the boat to rated trailer attachment points, while the ratchet, overcentre or camlock mechanism tensions the strap for transport. The published rating is 270kg load rating.

  

⚙️ Key Features

  

• Web width: 50mm

• Length: 5.5m

• Hook arrangement: over-boat hooks

• Published rating: 270kg load rating

• Marine-trailer securing application

• Supplied as: single

  

📏 Specifications

  

• Webbing: 50mm

• Length: 5.5m

• Hardware: over-boat hooks

• Rating: 270kg load rating

• Quantity: single

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 3957

• All Dunbier tie-downs must be used within their permanent marked rating

• Related Dunbier tie-down family: 3930-3974

  

🚤 Trailer Compatibility & Application

  

• Suitable for securing the bow, transom, personal watercraft or complete boat only as described by the product type

• Attachment points must be structurally rated and correctly positioned

• The working load must be based on the product label, not breaking strength alone

  

🔌 Function

  

Restrains the boat against vertical and lateral movement during road transport.

  

Common signs of wear or failure:

  

• Webbing is cut, frayed or UV-degraded

• Hooks are bent or coating is worn through

• Ratchet/camlock does not hold tension

• Stitching is damaged

• Rating label is unreadable

  

🛠️ Installation & Safety

  

• Inspect before every trip

• Do not knot, twist or run webbing over sharp edges

• Tension evenly without deforming the hull

• Use separate bow and transom restraints as required

• Replace any strap with damaged load-bearing fibres

  

📦 Condition

  

• Genuine Dunbier Marine Products part

• Brand new

• Supplied as one single Dunbier tie-down assembly

• Supplied in original or equivalent packaging

## Details

- **Price:** 35.5 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 35.50 AUD | In stock |

## Images

- 3957 Dunbier Over-Boat Ratchet Tie-Down 5.5m | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3957-dunbier-over-boat-ratchet-tie-down-5-5m)
> Updated: 2026-08-05