Mercury MerCruiser Nut (.312-24) 862902
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Genuine OEM Nut (.312-24) — Part 862902
This genuine OEM nut is engineered to the exact thread specification called out in the Mercury MerCruiser parts diagram — 5/16"-24 fine thread, factory dimensions, and correct finish. When your service manual calls for part 862902, this is the correct replacement, not a generic substitute.
Key Specifications
- Part Number: 862902
- Thread: .312-24 (5/16"-24 fine thread)
- Genuine OEM — not aftermarket
- Fitment: Mercury MerCruiser assemblies specifying part 862902
Fitment
Match this nut to your Mercury parts diagram using your engine model, serial number, and assembly location. Thread pitch and diameter vary across Mercury hardware — always confirm the part number before ordering.
When to Replace
Replace when the nut shows corrosion, thread damage, rounding, or when it has been removed during service and cannot be reliably retorqued to specification.
Installation
Clean threads on both the fastener and mating stud before installation. Follow the Mercury service manual for correct torque values, locking compound requirements, and reuse limits.
Parts Desk Insights
Best use case: The .312-24 fine-thread specification makes this nut a common service item on MerCruiser stern drive and inboard engine assemblies where fine-thread fasteners are used for precise clamping — including drive shaft, gimbal, and bracket hardware. Fine-thread nuts should never be substituted with coarse-thread equivalents; always match the thread pitch exactly to the diagram specification.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.