A1580 Mackay 5/8 x 4 UNF Greaser Load Sharing Bolt | Marine Trailer Part
A1580 Mackay 5/8 x 4 UNF Greaser Load Sharing Bolt | Marine Trailer Part
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🔧 Product Description
Genuine Mackay Marine Trailer Products Greaseable Load-Sharing Spring Bolt 5/8" × 4" – Part Number: A1580
A heavy-duty 5/8" × 4" UNF suspension bolt for Mackay load-sharing and Rocka spring systems. The drilled grease passage and nipple allow lubricant to be delivered to the bush.
⚙️ Key Features
- 5/8" × 4" UNF high-strength suspension bolt
- Designed for load-sharing spring pivots
- Supports replaceable nylon or steel bushes
- Greaseable internal passage
- Grease-nipple orientation: straight grease nipple
📏 Specifications
- Nominal size: 5/8" × 4" UNF
- Lubrication: Greaseable
- Nipple angle: straight grease nipple
- Grip length, thread length and shank diameter must match the hanger and bush
🔄 Cross Reference & Related Parts
- 90-degree greaseable version: Mackay A1572
- Non-greaseable version: Mackay A1570
🚤 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
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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