Mercury MerCruiser #10-32 Well Nut - 11-42290
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The Mercury MerCruiser Quicksilver 11-42290 is a genuine Mercury Marine OEM well nut used as diagram-specific expansion mounting hardware on select Mercury, Mariner, and MerCruiser assemblies. This fastener uses a rubber sleeve with an internal threaded insert to provide a blind-mount fastening point where access behind the panel or housing is limited. It is commonly used where the factory parts diagram calls for 42290 / 11-42290 in control, cowling, bracket, or panel-mounting locations.
Key Features
- Genuine Mercury Marine factory OEM well nut.
- Mercury/MerCruiser part number: 11-42290.
- Manufacturer part number: 42290.
- Expansion-style blind mounting fastener.
- Commonly described as a rubber well nut with internal threaded insert.
- Thread size: #10-32, where specified by the matching screw and diagram.
- Approximate dimensions: 1.13 in. L x 0.63 in. W x 0.63 in. H.
- Helps provide vibration isolation and a secure mounting point on thin panels, cowling pieces, control housings, and bracket locations where specified.
Application Compatibility
Common application context includes select Mercury, Mariner, and MerCruiser assemblies by serial number, control model, and diagram location, including:
- Select Mercury remote control assemblies where the diagram calls for 11-42290 / 42290
- Select single-lever control housing or lower cover mounting locations where specified
- Select engine cowling, air attenuator, bracket, and panel-mounting locations where specified
- Thin-wall fiberglass, aluminum, plastic, or hollow mounting points where Mercury specifies this well nut
Use this well nut only where the Mercury/MerCruiser parts diagram specifically calls for 11-42290 / 42290.
Fitment Notice
Confirm fitment by engine serial number, control assembly number, mounting panel thickness, screw size, and exact Mercury/MerCruiser parts diagram before ordering. Mercury uses different well nuts, rubber mounts, clips, screws, washers, and inserts across similar remote control, cowling, and bracket assemblies, so matching the thread size alone is not enough.
When This Part Needs Replacement
Replace this well nut if the rubber sleeve is cracked, hardened, swollen, torn, loose, missing, or no longer expands properly behind the mounting surface. It should also be replaced if the threaded insert spins, strips, corrodes, pulls out, or no longer holds the matching screw securely. A worn well nut can allow control panels, covers, brackets, or cowling parts to rattle, loosen, or leak around the mounting point.
Installation Notes
Install this well nut in the exact mounting hole and orientation shown in the Mercury parts diagram. Make sure the hole is clean and correctly sized before installation. Tighten the matching #10-32 screw only enough to expand the rubber sleeve and secure the component; overtightening can damage the rubber body, strip the insert, or distort thin panels. Inspect the matching screw, washer, cover, control housing, and mounting surface while the hardware is apart.
Alternate/Superseded Part Numbers
- 11-42290 — Mercury/MerCruiser formatted part number
- 42290 — Manufacturer part number
Parts Desk Insight
Well nuts are useful in marine assemblies because they can secure parts where there is no rear access for a standard nut. They also help reduce vibration transfer through thin covers and panels. For best fit, match the well nut to the Mercury diagram, screw size, and mounting hole rather than substituting a generic hardware-store insert.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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.
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