# H3813G Mackay M12 x 50mm Bolt Galvanised(Completely Threaded) | Marine Trailer Part

🔧 Product Description

  

Mackay M12 × 50mm Galvanised Steel Hex Bolt - Part Number: H3813G

  

A galvanised steel M12 × 50mm hex bolt for Mackay trailer brackets and assemblies where the dimensions and grade match.

  

⚙️ Key Features

  

• M12 diameter

• 50mm length

• Hex Bolt

• Galvanised Steel

• Use specified joint grade

• Nut/washer separate unless stated

  

📏 Specifications

  

• Thread: M12

• Length: 50mm

• Type: Hex Bolt

• Material: Galvanised Steel

• Strength: Use specified joint grade

  

🔄 Cross Reference & Related Parts

  

• Mackay: H3813G

  

🚤 Trailer Compatibility & Application

  

• Use in specified Mackay joint

• Grip/head style must match

• Critical joints require correct grade

  

🔌 Function

  

Provides locating and clamping force in the trailer assembly.

  

Common signs of wear or replacement:

  

• Stripped thread

• Bent shank

• Rounded head

• Corrosion

• Elongated holes

• Loosening

  

🛠️ Installation & Safety

  

• Match size/grade

• Use correct nut/washers

• Do not downgrade

• Torque correctly

• Protect dissimilar metals

• Replace yielded hardware

  

📦 Condition

  

• Genuine Mackay Trailers part

• Brand new

• Supplied as one M12 × 50mm hex bolt

• Supplied in original or equivalent packaging

## Details

- **Price:** 1.6 AUD
- **Vendor:** Mackay
- **Tags:** Mackay Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1.60 AUD | In stock |

## Images

- H3813G Mackay M12 x 50mm Bolt Galvanised(Completely Threaded) | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/h3813g-mackay-m12-x-50mm-bolt-galvanisedcompletely-threaded-1)
> Updated: 2026-08-05