Mercury MerCruiser OEM Stainless Steel Nut 826709111 | 5/16-24 UNF | Supersedes 45592
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Mercury / MerCruiser OEM Stainless Steel Nut — Part No. 826709111 / 11-826709111
| Part Number | 826709111 / 11-826709111 |
|---|---|
| Brand | Mercury Marine / MerCruiser |
| Product Type | Stainless Steel Hex Nut |
| Thread | 5/16-24 UNF (fine thread) / .312-24 |
| Material | Stainless steel |
| Supersedes | 45592 |
| Sold As | Individually |
| UPC / GTIN | 745061072817 |
About This Part
The 826709111 / 11-826709111 is a genuine Mercury Marine / MerCruiser OEM stainless steel nut with a 5/16-24 UNF fine thread. It supersedes the earlier Mercury part number 45592. Mercury uses this nut across multiple mechanical and mounting assemblies — the thread specification and diagram position are the reliable identifiers, as this fastener is not tied to a single engine or drive family.
Compatible Applications
Confirm the exact assembly, stud diameter, thread pitch, and diagram item number before ordering. Documented applications include:
- Water pump body stud nut on selected MerCruiser gear-housing assemblies — one nut per assembly on a 5/16-24 water-pump-body stud
- Fuel filter / water separator bracket hardware
- Throttle and shift control linkage assemblies — sometimes paired with stainless washer 8M0042642
- Other Mercury assemblies where the parts diagram specifically calls for 826709111
Fitment Notice
Mercury uses many visually similar stainless nuts in nearby assemblies with different thread sizes, including 1/4-28 UNF and 3/8-16 UNC. Visual matching alone is not reliable. Confirm both the thread pitch (5/16-24 fine) and stud diameter against your parts diagram before ordering. Do not substitute a coarse-thread 5/16-18 UNC nut — it will not engage correctly on a 5/16-24 fine-thread stud.
When to Replace
- Threads are damaged, stretched, or cross-threaded
- Corrosion is present on the threads or flats
- The flats are rounded and the nut can no longer be driven to torque
- The nut no longer tightens securely on the stud
- The associated stud, bracket, or mounting assembly has been replaced
- The service procedure specifies replacement hardware
Inspect the mating stud and any associated washer at the same time.
Installation Notes
- Confirm the mating stud is 5/16-24 UNF fine thread before installation
- Clean the stud threads before fitting the new nut
- Start the nut by hand to avoid cross-threading — fine-thread fasteners are more susceptible to cross-threading than coarse-thread equivalents
- Use the correct washer where the diagram specifies one — on throttle/control assemblies, Mercury pairs this nut with stainless washer 8M0042642
- Torque to the specification in the applicable Mercury service manual for the specific assembly
Technical FAQ
What is the difference between 5/16-24 and 5/16-18?
5/16-24 is a fine thread (24 threads per inch) and 5/16-18 is a coarse thread (18 threads per inch). These are not interchangeable — a coarse-thread nut will not engage properly on a fine-thread stud and must never be substituted. Always confirm thread pitch with a thread gauge if in doubt.
What replaced part number 45592?
826709111 / 11-826709111 is the current Mercury part number that supersedes 45592. If your parts diagram or service records show 45592, order 826709111.
Parts Desk Insights
The key to getting 826709111 right is the 5/16-24 fine thread — that’s what sets it apart from the more common coarse-thread hardware in nearby assemblies. It shows up in several different locations across Mercury and MerCruiser products, so the engine model alone won’t tell you if it’s the right nut. The most common mistake is grabbing a 5/16-18 coarse-thread nut from a hardware store because it looks identical — it won’t thread onto a fine-thread stud and can damage the stud if forced. Use a thread gauge if you’re not sure what’s on the engine, and always match the diagram position and item number, not just the size.
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
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.