Mercury MerCruiser — #10-32 x 5/8 in. Screw — 806290
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Mercury MerCruiser Screw 806290 | #10-32 × 5/8 in.
The Mercury MerCruiser 806290 is a genuine OEM #10-32 × 0.625 in. machine screw used to secure sacrificial-anode assemblies on select MerCruiser sterndrives and trim cylinders. It's commonly paired with external lock washer 69432 in factory Mercury diagrams.
Compatible Applications
- Bravo One
- Bravo Three
- Bravo XR gear-housing assemblies
- MerCruiser trim-cylinder anode assemblies
- Additional MerCruiser gearcase/anode installations where 806290 is specified
Depending on the assembly, Mercury diagrams show 2 or 4 screws required. Confirm your drive model, serial number, and diagram position before ordering, since Mercury uses several similar small screws around sterndrive anodes.
Part Details
- Part number: 806290
- Full service number: 10-806290
- Brand: Mercury Marine
- Official product type: Machine screw / anode fastener
- Thread: #10-32
- Length: 0.625 in. / 5/8 in. / 15.9 mm
- System: Sterndrive / corrosion protection / trim
- GTIN: 745061080355
Verified Uses
- Bravo trim-cylinder anodes — typically 4 per assembly
- Bravo gear-housing anodes — typically 2 per applicable assembly
Related Parts
- 69432 — External #10 lock washer, commonly paired with this screw
When This Part Needs Replacement
Replace the screw if the threads or head are damaged, corrosion prevents proper tightening, or the fastener is lost during anode service. Inspect the matching lock washer whenever the screw is removed.
Installation Notes
Install with the specified anode assembly and external lock washer 69432 where shown. Use the applicable Mercury service procedure and tightening specification. Do not overtighten small anode fasteners.
Alternate/Superseded Part Numbers
- 806290 — OEM part number
- 10-806290 — full Mercury service number
- No verified superseding number
Technical FAQ
How many screws do I need? Depending on the assembly, Mercury diagrams call for either 2 or 4 screws, so check your specific drive's diagram before ordering.
Do I need a new lock washer too? If you are replacing this screw, inspect lock washer 69432 at the same time since it's commonly paired with 806290 in the factory assembly.
Parts Desk Insights
Best use case: This screw is commonly needed when servicing MerCruiser sterndrive or trim-cylinder anodes, securing the anode plate to the gear housing or trim cylinder.
Common mistake: A common mistake is substituting a similar-looking hardware-store screw. Matching the exact thread (#10-32) and length (5/8 in.) to 806290, rather than appearance alone, keeps the anode properly secured.
Sizing and fitment: If you are unsure whether your assembly needs 2 or 4 screws, check your drive's parts diagram, and replace the lock washer 69432 alongside this screw for a proper factory fit.
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.