H3263 Mackay 8903 Dunbier 7/16 x 2 1/4 UNF Grade 8 Bolt Z/P Caliper Bolt | Marine Trailer Part

🔧 Product Description

Genuine Mackay Marine Trailer Products Grade 8 Caliper Bolt 7/16" × 2-1/4" UNF – Part Number: H3263

A high-strength zinc-plated mounting bolt for compatible mechanical trailer disc calipers.

⚙️ Key Features

• Grade 8 high-tensile construction
• 7/16-inch UNF thread
• Zinc-plated finish

📏 Specifications

• Dunbier cross reference: 8903
• Size: 7/16" × 2-1/4" UNF

🔄 Cross Reference & Related Parts

• Caliper bolt lock: H3250
• Mounting kit: H3261K

🚤 Compatibility & Application

• Compare the removed component and brake-system geometry before installation
• Use high-tensile hardware and specified torque where load-bearing
• After service, confirm free rotation, full brake application and full release

🔌 Function

Secures the caliper to the mounting plate and carries brake reaction loads.

⚠️ Common Signs of Failure

• Component is bent, cracked, seized or heavily corroded
• Mounting holes or threads are damaged
• Brake operation is uneven or unreliable

📦 Condition

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