2121 Dunbier U-Bolt Square 67 x 60 x 12mm | Marine Trailer Part

🔧 Product Description

Dunbier Square U-Bolt 67 × 60 × 12mm – Single – Part Number: 2121

A galvanised square trailer U-bolt with an internal width of approximately 67mm, an inside leg length of approximately 60mm and a 12mm rod diameter. It is used with the matching fish plate and nuts to clamp an axle, chassis member or suspension component.

⚙️ Key Features

• Square-form galvanised U-bolt
• Internal width approximately 67mm
• Inside leg length approximately 60mm
• Rod diameter 12mm
• Supplied as 1 u-bolt

📏 Specifications

• Dimension A – inside width: 67mm
• Dimension B – inside length: 60mm
• Rod diameter: 12mm
• Shape: Square
• Package: Bulk/single component

🔄 Cross Reference & Related Parts

• Dunbier: 2121
• Matching fish plate and axle/chassis dimensions must be confirmed
• Dunbier current catalogue U-bolt dimensions are listed by inside width × inside length × rod diameter
• Pair-pack references use an S suffix; bulk/single references commonly use a B suffix

🚤 Trailer Compatibility & Application

• Suitable only where the U-bolt fits fully around the intended square beam without spreading
• Threaded length must allow the fish plate, washers and nuts to engage correctly
• Do not substitute a different rod diameter or bend radius without checking the suspension design

🔌 Function

Clamps the axle or structural member securely against the spring and fish plate or associated trailer bracket.

⚠️ Common Signs of Failure

• Threads are stretched, stripped or heavily corroded
• U-bolt legs are bent or spread
• Nuts repeatedly lose torque
• Rust has reduced rod diameter
• Axle or bracket has moved under the clamp

🛠️ Installation & Safety

• Do not reuse U-bolts that have been fully torqued, stretched or corroded
• Tighten both legs progressively and evenly
• Use matching nuts, washers and fish plate
• Confirm adequate thread engagement without bottoming the nuts
• Re-torque after initial loaded travel

📦 Condition

• Brand new Dunbier Marine Products trailer component
• Supplied as one single galvanised square U-bolt
• Supplied in original or equivalent packaging