3123 Dunbier Heavy-Duty Slide Bracket Suits 75 x 50mm | Marine Trailer Part

🔧 Product Description

Genuine Dunbier Marine Products Heavy-Duty Slide Bracket for 75 × 50mm Cross-Member – Part Number: 3123

A heavy-duty galvanised trailer slide bracket designed to clamp around a 75 × 50mm rectangular cross-member and hold a 40mm square tube support leg. The adjustable clamping arrangement allows roller, pad or hull-support height and position to be set without welding.

⚙️ Key Features

• Heavy-duty galvanised steel construction
• Designed for a 75 × 50mm rectangular trailer cross-member
• Accepts a 40mm square tube support leg
• Mounting arrangement: heavy-duty slide clamp
• Allows support assemblies to be repositioned during trailer setup

📏 Specifications

• Cross-member size: 75 × 50mm rectangular
• Support-leg size: 40mm square tube
• Bracket style: heavy-duty slide clamp
• Supply format: complete bracket with galvanised bolts and nuts
• Fastener grade, bolt length and hole centres must match the supplied bracket

🔄 Cross Reference & Related Parts

• Angled left-hand version: Dunbier 3123BAL
• Angled right-hand version: Dunbier 3123BAR
• Related standard heavy-duty brackets: Dunbier 3122 and 3125

🚤 Compatibility & Application

• Compatible Dunbier roller, pad and support assemblies using the stated leg size
• Measure the cross-member outside dimensions before ordering
• The bracket must clamp squarely without crushing or distorting the trailer tube
• Set both sides evenly so the boat hull is supported symmetrically
• Retighten mounting hardware after the first launch/retrieval cycle and during scheduled servicing

🔌 Function

Clamps an adjustable roller, pad or support leg to the trailer cross-member and allows the support height, spacing and hull contact position to be tuned.

⚠️ Common Signs of Failure

• Bracket is bent, cracked or no longer clamps squarely
• Locking bolt or threads are stripped
• Support leg slips under load
• Mounting holes or slots are elongated
• Galvanising is lost and structural corrosion develops

📦 Condition

• Genuine Dunbier Marine Products part
• Brand new
• Supplied in original or equivalent packaging