Mercury - Gimbal Housing Lock Nut - 11-34087
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You have 30 days to request a return. All sale items are final sale.
The Mercury Quicksilver Gimbal Housing Lock Nut 11-34087 is an OEM-style red Nyloc hex locking nut used in select MerCruiser transom and gimbal housing assemblies. It helps secure the gimbal housing mounting hardware, maintaining clamping force between the outer transom assembly and inner transom plate.
Key Features
- Genuine Mercury/Quicksilver locking nut
- Part number: 11-34087
- Also referenced as 34087
- 1/2"-13 coarse thread
- Red nylon locking insert
- Used on select gimbal housing and transom assembly mounting hardware
- GTIN / UPC: 745061136991
Drive Compatibility
Used on select MerCruiser R, MR, Alpha One Gen 1, and Bravo I / II / III transom assembly applications. Also found across various legacy MerCruiser sterndrive packages, including classic inline and V8 configurations where this nut is shown in the transom assembly diagram.
Serial Number Fitment Notice
Verify fitment by drive/transom serial number, gimbal housing diagram, and original hardware stack-up before ordering. Transom hardware can vary by drive generation, housing style, bolt length, and production range.
When This Part Needs Replacement
Replace this lock nut if the nylon insert is worn, melted, loose, damaged, corroded, or if the nut has been removed during transom or gimbal housing service.
Installation Notes
Install only in the correct gimbal housing mounting locations shown in the Mercury parts diagram. Inspect the mounting bolts, washers, transom plate, seal surfaces, and surrounding hardware before reassembly. Follow Mercury service procedures for torque specifications and tightening sequence.
Alternate/Superseded Part Numbers
Primary Mercury references: 11-34087 and 34087.
Parts Desk Insight
Lock nuts with nylon inserts should not be treated like standard reusable hardware in critical mounting areas. If the insert no longer grips properly, replacing the nut helps maintain transom clamping force and reduces the risk of vibration-related loosening.
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.
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.