Mercury MerCruiser Quicksilver 5/16-24 Hex Nut 862902 | Replaces 25594
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Part Details
- Part Number: 862902
- Service Format: 11-862902
- Brand: Mercury / Quicksilver
- Type: Hex nut — 5/16”-24 fine thread
- System: Sterndrive and inboard engine hardware — driveshaft, gimbal, and bracket assemblies
- Weight: Approx. 0.014 kg
- Replaces: 25594
- Note: Fine-thread (5/16”-24) specification. Do not substitute with a coarse-thread nut of the same diameter — confirm thread pitch from the Mercury parts diagram before ordering.
About This Part
Genuine Mercury / Quicksilver 11-862902 is an OEM 5/16”-24 fine-thread hex nut used in Mercury MerCruiser sterndrive and inboard engine assemblies. The 5/16”-24 fine-thread specification is commonly found in MerCruiser drive shaft, gimbal housing, and bracket hardware locations where precise clamping and thread engagement are required. Because fine-thread and coarse-thread nuts of the same diameter are not interchangeable, always confirm the thread pitch from the Mercury parts diagram for the specific assembly being serviced before ordering.
Compatible Applications
- MerCruiser sterndrive assemblies specifying nut 862902 or earlier number 25594 in the parts diagram
- MerCruiser driveshaft, gimbal housing, and engine bracket hardware positions calling for a 5/16”-24 fine-thread nut
Confirm by exact engine model, serial number, and parts-diagram position. Thread pitch is critical — match the OEM part number to the diagram callout rather than selecting by diameter alone.
When to Replace
Replace this nut if it shows any of the following:
- Corrosion or surface pitting affecting thread integrity
- Stripped or cross-threaded engagement on the mating stud
- Rounded hex flats from incorrect tool use
- Distortion from overtightening
- The Mercury service procedure specifies new hardware after removal
Installation Notes
Clean threads on both the nut and mating stud before installation. Follow the Mercury service manual torque specification for the exact assembly — do not apply a generic torque value based on thread size alone. Check whether the service procedure requires a locking compound or replacement hardware rather than reuse, particularly in critical driveshaft or gimbal housing locations.
Cross-Reference Part Numbers
- Current OEM: 862902 / 11-862902
- Replaces: 25594
- Thread: 5/16”-24 fine thread
Parts Desk Insight
862902 is a 5/16”-24 fine-thread Mercury hex nut most commonly used in MerCruiser sterndrive and engine bracket hardware. The most important detail is the fine-thread specification — a coarse-thread nut of the same diameter will not engage correctly on a fine-thread stud and should never be substituted. When servicing MerCruiser gimbal or driveshaft hardware, replace all nuts in the assembly rather than reusing originals, as corrosion in marine environments often affects thread engagement even on nuts that appear visually acceptable.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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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.
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