# 1017 Dunbier 13mm Safety Chain and HammerLock | Marine Trailer Part

🔧 Product Description

  

Dunbier Heavy-Duty Herc-Alloy Safety Chain with Hammerlock - Part Number: 1017

  

A heavy-duty 13mm Herc-Alloy trailer safety chain assembly supplied with a compatible Hammerlock connecting link. Dunbier catalogues specify a 13-link chain approximately 500mm long and require two assemblies for trailers in the 3.5-4.5 tonne range, subject to current vehicle standards and the component's marked capacity.

  

⚙️ Key Features

  

• 13mm high-strength Herc-Alloy chain

• Thirteen-link assembly

• Supplied with Hammerlock connecting link

• Heavy-trailer safety-chain application

• Galvanised or protective finish for trailer service, depending current supply

  

📏 Specifications

  

• Chain diameter: 13mm

• Link quantity: 13

• Approximate chain length: 500mm

• Quantity required by Dunbier for 3.5-4.5 tonne applications: Two

• Final capacity must be confirmed from the chain and connecting-link markings

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 1017

• Related lighter safety chains: Dunbier 1018, 1019, 1020, 1021 and 1022

• Comparable product: Grade-T/Herc-Alloy heavy-trailer chain assembly with certified Hammerlock and equivalent marked capacity

  

🚤 Trailer Compatibility & Application

  

• Intended for heavy trailers above the normal AS 4177.4 light-trailer chain range

• Both chains must be independently attached to substantial trailer and tow-vehicle points

• Connection hardware must equal or exceed the chain rating

  

🔌 Function

  

Provides a secondary connection intended to retain and control the trailer if the primary coupling disconnects or fails.

  

Common signs of wear or replacement:

  

• Bent, stretched, cracked or heavily worn links

• Hammerlock pin or retaining sleeve is damaged

• Deep corrosion or loss of chain diameter

• Heat, welding or grinding damage

• Capacity markings are missing or unreadable

  

🛠️ Installation & Safety

  

• Heavy-trailer chain installation must comply with current road and trailer regulations

• Do not weld directly to heat-treated alloy chain

• Fit the Hammerlock exactly as specified, with the correct load pin and retainer

• Cross or arrange chains as required to support and control the drawbar

• Never use a damaged or unmarked assembly

  

📦 Condition

  

• Brand new Dunbier Marine Products trailer component

• Supplied as one 13mm safety chain with Hammerlock

• Supplied in original or equivalent packaging

## Details

- **Price:** 130.5 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 130.50 AUD | In stock |

## Images

- 1017 Dunbier 13mm Safety Chain and HammerLock | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/1017-dunbier-13mm-safety-chain-hammerlock)
> Updated: 2026-08-05