8934 Dunbier Shakeproof Washer M12 (Plastic Mudguards) | Marine Trailer Part

🔧 Product Description

Dunbier Shakeproof Washer M12 for Plastic Mudguards – Part Number: 8934

A M12 toothed shakeproof washer used in Dunbier trailer hardware to spread clamping load, protect the component surface or provide the locking action required by the original joint.

⚙️ Key Features

• M12 nominal fastener size
• toothed shakeproof washer design
• plated steel finish
• Application: Dunbier plastic mudguard mounting bolts
• Replacement service component

📏 Specifications

• Nominal size: M12
• Washer type: toothed shakeproof washer
• Finish/material: plated steel
• Inside diameter, outside diameter and thickness must match the original application
• The toothed face helps resist rotation and spreads retention across the plastic-mudguard mounting joint

🔄 Cross Reference & Related Parts

• Dunbier: 8934
• A generic equivalent must match inside diameter, outside diameter, thickness, hardness and finish
• Do not replace a hardened axle or structural washer with a thin general-purpose washer

🚤 Trailer Compatibility & Application

• Suitable for Dunbier plastic mudguard mounting bolts
• The washer must sit flat and fully support the nut or bolt head
• Use only with the matching bolt diameter and joint design

🔌 Function

Distributes fastener load, protects the clamped surface and performs the specified spacing or locking role.

⚠️ Common Signs of Failure

• Washer is dished, cracked, deeply grooved or worn thin
• Hole is elongated
• Corrosion has reduced the bearing area
• Shakeproof teeth or spring tension are flattened
• Washer no longer sits flat against the component

🛠️ Installation & Safety

• Install on a clean flat surface
• Orient toothed or shakeproof washers as required by the original joint
• Replace spring and shakeproof washers that have lost tension
• Use the correct hardened washer under high-load axle and structural nuts
• Torque the associated fastener to specification

📦 Condition

• Brand new Dunbier Marine Products trailer component
• Supplied as one replacement washer
• Supplied in original or equivalent packaging