8893 Dunbier M12 x 170 Zinc High-Tensile Bolt and Nyloc Nut | Marine Trailer Part

🔧 Product Description

Dunbier Zinc-Plated High-Tensile Bolt M12 × 170mm with Nyloc Nut - Part Number: 8893

A replacement M12 × 170mm trailer fastener supplied in a zinc-plated high-tensile steel configuration. It is intended for high-load Dunbier trailer brackets, pivots and structural joints that specify this exact M12 length and should only replace hardware with the same dimensional, thread and strength specification.

⚙️ Key Features

• M12 fastener diameter

• Nominal length: 170mm

• zinc-plated high-tensile steel finish/material

• Hex-head trailer fastener

• Suitable for marine trailer servicing when matched to the original installation

• Matching M12 nyloc nut supplied

📏 Specifications

• Diameter/thread: M12

• Nominal length: 170mm

• Thread form: metric coarse unless the original application specifies otherwise

• Strength requirement: high-tensile; confirm the property class stamped on the supplied bolt

• Finish/material: zinc-plated high-tensile steel

🔄 Cross Reference & Related Parts

• Dunbier: 8893

• 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 high-load Dunbier trailer brackets, pivots and structural joints that specify this exact M12 length

• 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 wear or replacement:

• 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