3119 Dunbier Rolla-Matic Mount 50mm Square | Marine Trailer Part

🔧 Product Description

Dunbier Rolla-Matic Universal Mount for 50 × 50mm Cross Member - Part Number: 3119

A galvanised universal cross-member mounting plate and U-bolt arrangement for attaching a compatible Dunbier Rolla-Matic support assembly to a 50 × 50mm trailer cross member.

⚙️ Key Features

• Galvanised mounting plate

• Designed for 50 × 50mm rectangular cross member

• Includes matching U-bolts and mounting hardware as supplied

• Allows Rolla-Matic position adjustment

• Bolt-on installation

📏 Specifications

• Cross-member application: 50 × 50mm

• Mounting width/adjustment range: Approximately 135-160mm depending assembly

• Supports compatible 20mm or 40mm Rolla-Matic legs through the associated bracket arrangement

🔄 Cross Reference & Related Parts

• Dunbier: 3119

• 50 × 50mm mount: Dunbier 3119

• 76 × 50mm mount: Dunbier 3120

• 102 × 50mm mount: Dunbier 3121

• Related Rolla-Matic assemblies: Dunbier 3100, 3100SQ, 3102, 3103 and 3110

🚤 Trailer Compatibility & Application

• Suitable for a structurally sound 50 × 50mm trailer cross member

• U-bolt width and length must fit the actual cross-member dimensions

• Support-leg size must match the Rolla-Matic assembly

🔌 Function

Clamps the Rolla-Matic support securely to the trailer cross member while allowing its lateral and vertical position to be adjusted.

Common signs of wear or replacement:

• Plate or U-bolts are bent

• Mount moves on the cross member

• Threads are stretched or corroded

• Cross member is crushed beneath the clamp

• Rolla-Matic leg cannot be retained securely

🛠️ Installation & Safety

• Install on a clean straight section of cross member

• Tighten U-bolts evenly

• Do not crush thin-wall trailer tube

• Align paired mounts before loading the boat

• Recheck nut torque after initial road and ramp use

📦 Condition

• Brand new Dunbier Marine Products trailer component

• Supplied as one Rolla-Matic mount kit for a 50 × 50mm cross member

• Supplied in original or equivalent packaging