ARK Marine Trailer Bearing Kit – Holden Type Bearings for 39mm Round & 40mm Square Axles (SKU: MBK32)

ARK Marine Trailer Bearing Kit – MBK32 is a premium Holden-type bearing set designed specifically for marine and trailer applications. Whether you’re servicing your boat trailer or upgrading from worn bearings, this kit delivers smooth operation and long-term durability under harsh conditions.

This kit suits both 39mm round axles and 40mm square axles, making it a popular choice for a wide range of Australian trailers. It includes a waterproof marine seal housed in stainless steel to keep water and grit out—an essential feature for saltwater exposure or wet terrain usage.

Inside the kit you’ll find both small and large bearings (¾” and 1¼” cone diameter) to fit Holden-style hubs, along with a split pin for secure axle installation. All components are precision-engineered to deliver high performance and reduced maintenance for heavy-duty and recreational towing alike.

Key Features:

• Holden type trailer bearing kit
• Fits 39mm round and 40mm square axles
• ¾” small cone diameter & 1¼” large cone diameter bearings
• Includes waterproof marine seal with stainless steel housing
• Supplied with split pin for axle securing
• Ideal for boat trailers, utility trailers, and general purpose setups

Designed for marine environments, this bearing kit helps ensure a smoother tow and longer component life even in salty or wet conditions. It’s a go-to choice for DIYers and trailer professionals alike.

FAQ

Q: What type of trailers is this kit suitable for?

A: It’s ideal for boat trailers, general utility trailers, and off-road trailers with 39mm round or 40mm square axles.

Q: Is the seal truly waterproof?

A: Yes, it includes a marine-grade waterproof seal with stainless steel housing—perfect for saltwater or wet use.

Q: What does “Holden Type” mean?

A: “Holden Type” refers to a specific bearing configuration common in Australian trailers, especially those built with Holden-style hubs.

Q: Do I need any extra parts for installation?

A: This kit includes the key components (bearings, seal, split pin), but you may need grease or a bearing buddy for best results.

Evaluation & Recommendation

The ARK MBK32 is a great match for those who frequently tow in wet, coastal, or off-road conditions. Its stainless steel marine seal makes it ideal for resisting rust and contamination.

Recommended for:

• Boat trailer owners needing corrosion-resistant bearing kits
• DIY trailer repairs or hub rebuilds
• General-purpose trailers with Holden-type hubs

Installation Tips:

• Thoroughly clean the hub and spindle before installing new bearings
• Pack bearings with high-quality marine grease
• Ensure the waterproof seal sits flush to prevent water ingress
• Secure with split pin and test hub spin before use

If your trailer uses a different hub style, check our other bearing kits or contact us for assistance selecting the right fit.