8911 Dunbier M12 x 90 Galvanised Bolt and Nut | Marine Trailer Part

🔧 Product Description

Dunbier Galvanised Hex Bolt M12 × 90mm with Nut – Part Number: 8911

A replacement M12 × 90mm trailer fastener supplied in a galvanised steel configuration. It is intended for Dunbier trailer brackets, rail mounts, suspension fittings or accessories requiring this exact metric fastener and should only replace hardware with the same dimensional, thread and strength specification.

⚙️ Key Features

• M12 fastener diameter
• Nominal length: 90mm
• galvanised steel finish/material
• Hex-head trailer fastener
• Suitable for marine trailer servicing when matched to the original installation
• Matching matching M12 nut supplied

📏 Specifications

• Diameter/thread: M12
• Nominal length: 90mm
• Thread form: metric coarse unless the original application specifies otherwise
• Strength requirement: standard trailer hardware; match the original bolt grade and head markings
• Finish/material: galvanised steel

🔄 Cross Reference & Related Parts

• Dunbier: 8911
• A generic replacement is acceptable only when diameter, length, thread pitch, strength grade, finish and shank configuration all match
• Do not substitute lower-grade hardware or an unverified stainless bolt in a high-tensile structural application

🚤 Trailer Compatibility & Application

• Suitable for Dunbier trailer brackets, rail mounts, suspension fittings or accessories requiring this exact metric fastener
• Measure the original bolt from beneath the head to the end of the thread unless the fastener standard states otherwise
• The unthreaded grip length must suit the clamped joint and must not bottom the nut before the components are secure
• Use the correct washer, locking nut or spring washer for the original joint

🔌 Function

Clamps the associated trailer components together and transfers shear, tension and vibration loads through the mounting joint.

⚠️ Common Signs of Failure

• Thread is stretched, crossed, stripped or heavily corroded
• Bolt shank is bent, necked, grooved or worn
• Hex head is rounded or cracked
• Joint repeatedly loosens despite correct torque and locking hardware
• Corrosion has materially reduced the fastener diameter

🛠️ Installation & Safety

• Confirm the replacement grade from the original bolt head and trailer parts documentation
• Do not reuse a fastener that has stretched, yielded or suffered severe corrosion
• Tighten to the specification for the exact bolt grade, thread, finish and joint
• Use corrosion-compatible washers and locking hardware
• Recheck critical trailer fasteners after the first trip and during routine servicing

📦 Condition

• Brand new Dunbier Marine Products trailer component
• Supplied as one bolt and matching nut
• Supplied in original or equivalent packaging