A1570 Mackay 5/8 x 4 UNF Non Greaser Load Sharing Spring Bolt | Marine Trailer Part

🔧 Product Description

Genuine Mackay Marine Trailer Products Non-Greaseable Load-Sharing Spring Bolt 5/8" × 4" - Part Number: A1570

A heavy-duty 5/8" × 4" UNF suspension bolt for Mackay load-sharing and Rocka spring systems. This non-greaser version uses a solid bolt and requires the bush to be lubricated during assembly.

⚙️ Key Features

• 5/8" × 4" UNF high-strength suspension bolt
• Designed for load-sharing spring pivots
• Supports replaceable nylon or steel bushes
• Solid non-greaseable construction
• No grease nipple

📏 Specifications

• Nominal size: 5/8" × 4" UNF
• Lubrication: Non-greaseable
• Nipple angle: Not applicable
• Grip length, thread length and shank diameter must match the hanger and bush

🔄 Cross Reference & Related Parts

• Greaseable straight version: Mackay A1580
• Greaseable 90-degree version: Mackay A1572

🚤 Compatibility & Application

• Compatible Mackay load-sharing or Rocka suspension pivot using the exact bolt dimensions
• Use with the correct bush, washers and locking nut
• Do not tighten against the threaded section where the suspension pivots
• Greaseable bolts require periodic lubrication with compatible chassis grease

🔌 Function

Forms the suspension pivot between the spring, rocker arm or hanger and carries shear load while allowing controlled rotation.

⚠️ Common Signs of Failure

• Bolt is bent, worn or grooved
• Threads are stretched or damaged
• Grease passage or nipple is blocked
• Bush has worn through to the bolt
• Suspension develops knocking or excessive lateral movement

📦 Condition

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