1489 Dunbier A1378C-5 Mackay Pack of 5 Wheel Alloy Long Wheel Nuts (Dacromet Finish) Not Chrome | Marine Trailer Part

🔧 Product Description

Genuine Dunbier Marine Products Dacromet-Coated Long Alloy-Wheel Nut – Pack of 5 – Part Number: 1489

A long-profile wheel nut for compatible Dunbier alloy trailer wheels. The Dacromet-coated finish provides corrosion protection for marine use and is intentionally different from decorative chrome plating.

⚙️ Key Features

• Long-body profile suited to compatible alloy-wheel recesses
• Dacromet corrosion-resistant finish
• Designed for trailer wheel-stud service
• Suitable for replacement of damaged or incorrect alloy-wheel nuts
• Supplied as a five-nut pack

📏 Specifications

• Thread size: Commonly 1/2-inch UNF in the Dunbier alloy-wheel range; verify the wheel stud
• Nut style: Long alloy-wheel nut
• Finish: Dacromet coated, not chrome
• Pack quantity: 5
• Seat profile must match the wheel’s machined nut seat

📋 Supplied Components

• 5 × Dacromet-coated long alloy-wheel nuts

🔄 Cross Reference & Related Parts

• Mackay reference: A1378C-5
• Individual replacement: Dunbier 1489B

🚤 Compatibility & Application

• Compatible Dunbier alloy wheels using the same stud thread and nut-seat geometry
• Do not use a tapered nut on a flat-seat wheel or a flat-seat nut on a tapered wheel
• Thread engagement must be adequate and the nut must not bottom before clamping the wheel
• Tighten in a cross pattern to the hub or trailer manufacturer torque
• Recheck torque after the initial short trip and after wheel removal

🔌 Function

Clamps the alloy wheel securely against the trailer hub and transfers wheel loads into the studs.

⚠️ Common Signs of Failure

• Threads are stretched, stripped or cross-threaded
• Seat is galled, cracked or deformed
• Nut repeatedly loses torque
• Dacromet coating is damaged and severe corrosion develops
• Hex flats are rounded

📦 Condition

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