Mercury MerCruiser Quicksilver Lockwasher 8M0204647
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Genuine Quicksilver Lockwasher — Part #8M0204647
This genuine Quicksilver lockwasher (.312) is a factory OEM fastener used in Mercury and MerCruiser assemblies where the parts diagram calls for part number 8M0204647. Lockwashers are a critical part of any proper reassembly — they prevent fasteners from backing out under vibration and load, which is especially important in the demanding environment of a marine engine or drive.
Fits Where the Diagram Calls It Out
This lockwasher is used across a range of Mercury and MerCruiser assemblies. Always verify fitment by matching part number 8M0204647 to your engine's current parts diagram using your model number and serial number before ordering.
Frequently Ordered With
- Mercury MerCruiser Quicksilver O-Ring 8M0204645
- Mercury MerCruiser Quicksilver Gasket, Inlet Seat 25033
Parts Desk Insights
Best use case: This lockwasher is the right choice when reassembling a Mercury or MerCruiser component that specifically calls for part number 8M0204647 in the factory diagram. It's most commonly needed during carburetor rebuilds or fuel system service where fasteners and sealing hardware are replaced as a set. Best practice is to replace lockwashers any time the fastener is removed — reusing a crushed or deformed lockwasher compromises clamping force. Pair this with the O-Ring 8M0204645 and Inlet Seat Gasket for a complete service. Confirm the part number against your current Mercury parts diagram — similar hardware varies by production range and assembly location.
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.