A1378C-5 Mackay 1489 Dunbier Wheel Alloy Long Wheel Nuts (Dacromet Finish) Pack of 5 | Marine Trailer Part

🔧 Product Description

Genuine Mackay Marine Trailer Products Long Alloy-Wheel Dacromet Nut Pack - Part Number: A1378C-5

A dacromet long wheel nut for compatible Mackay trailer hubs and wheels. The component matches the commonly 1/2" UNF; verify stud thread used by the stated wheel pattern and is supplied in a pack of 5.

⚙️ Key Features

• commonly 1/2" UNF; verify stud thread specification
• Designed for compatible Dunbier/Mackay alloy wheels
• Dacromet corrosion-resistant finish
• Pack quantity: 5
• Replacement for damaged, stretched or corroded wheel hardware

📏 Specifications

• Component type: long wheel nut
• Thread size: commonly 1/2" UNF; verify stud
• Wheel/hub pattern: compatible Dunbier/Mackay alloy wheels
• Finish: Dacromet
• Pack quantity: 5
• Seat profile, knurl diameter and installed length must match the hub and wheel

📋 Supplied Components

• 5 × long wheel nuts

🔄 Cross Reference & Related Parts

• Dunbier cross reference: 1489
• Individual long nut: Dunbier 1489B

🚤 Compatibility & Application

• Confirm the existing wheel-stud thread and wheel-nut seat before installation
• Press-in studs require the correct knurl diameter and hub flange thickness
• Wheel nuts must provide adequate thread engagement without bottoming
• Tighten wheel nuts in a cross pattern and recheck after the first trip

🔌 Function

Secures the trailer wheel to the hub and transfers driving, braking and cornering loads through the stud pattern.

⚠️ Common Signs of Failure

• Threads are stripped, stretched or cross-threaded
• Stud knurl turns inside the hub
• Nut seat is galled or cracked
• Wheel nuts repeatedly lose torque
• Corrosion or impact damage weakens the component

📦 Condition

• Genuine Mackay Marine Trailer Products part
• Brand new
• Supplied in original or equivalent packaging