8921 Dunbier 5/8" Nyloc Nut Zinc | Marine Trailer Part

🔧 Product Description

Dunbier Zinc-Plated Nyloc Nut 5/8" - Part Number: 8921

A replacement 5/8" nylon-insert lock nut nut for Dunbier trailer hardware. The nut secures the matching bolt or stud and should be selected by exact diameter, pitch, seat style, grade and finish.

⚙️ Key Features

• 5/8" thread size

• zinc-plated finish

• nylon-insert lock nut configuration

• Replacement trailer fastening component

• Suitable for marine trailer repairs when matched to the original thread and grade

📏 Specifications

• Thread size: 5/8"

• Nut type: nylon-insert lock nut

• Finish: zinc-plated

• Thread pitch must match the original bolt or stud

🔄 Cross Reference & Related Parts

• Dunbier: 8921

• Comparable generic nuts must match the thread pitch, strength class, locking design and corrosion protection

• Do not mix metric, UNC, UNF or Whitworth-style imperial threads

🚤 Trailer Compatibility & Application

• Suitable only for bolts or studs with the matching thread

• Nyloc nuts should not be used where service temperature or repeated removal exceeds the insert specification

• Use a plain nut only where the original joint includes a separate locking method

🔌 Function

Develops the clamping force that retains the trailer joint, wheel component, bracket or accessory.

Common signs of wear or replacement:

• Threads are stripped, stretched or heavily rusted

• Nylon insert no longer resists rotation

• Nut corners are rounded

• Nut repeatedly loosens

• Seat or bearing face is cracked, galled or distorted

🛠️ Installation & Safety

• Start the nut by hand to prevent cross-threading

• Use the correct torque for the bolt grade and joint

• Replace a nyloc nut when its insert no longer provides positive resistance

• Do not use an impact tool to force a mismatched thread

• Recheck critical joints after initial use

📦 Condition

• Brand new Dunbier Marine Products trailer component

• Supplied as one replacement nut

• Supplied in original or equivalent packaging