# H3651 Mackay 50mm x 50mm Winch Post Cap Plastic | Marine Trailer Part

🔧 Product Description

  

Genuine Mackay Marine Trailer Products Plastic Winch-Post Cap for 50 × 50mm Section - Part Number: H3651

  

A replacement plastic cap for a 50 × 50mm Mackay winch-post tube.

  

⚙️ Key Features

  

• Fits 50 × 50mm post section

• Plastic construction

• Closes the open post tube

• Replacement service component

  

📏 Specifications

  

• Post section: 50 × 50mm

• Material: Plastic

• Fit style must match post wall and outside dimensions

  

🔄 Cross Reference & Related Parts

  

• Use with the matching Mackay winch-post family

  

🚤 Compatibility & Application

  

• Clean and deburr the tube end

• Press, fasten or weld according to cap type

• Restore corrosion protection after welding steel caps

  

🔌 Function

  

Closes the post end and reduces water, dirt and sharp-edge exposure.

  

Common signs of wear, damage or replacement required:

  

• Cap is loose, cracked or missing

• Steel cap or weld is corroded

• Water and debris enter the post

  

📦 Condition

  

• Genuine Mackay Marine Trailer Products part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 8.3 AUD
- **Vendor:** Mackay
- **Tags:** Mackay Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 8.30 AUD | In stock |

## Images

- H3651 Mackay 50mm x 50mm Winch Post Cap Plastic | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/h3651-mackay-50mm-x-50mm-winch-post-cap-plastic-1)
> Updated: 2026-08-05