Quicksilver Lockwasher 8M0204647 (.312 in.) | Mercury MerCruiser OEM Hardware
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Quicksilver OEM Lockwasher — Part No. 8M0204647
- Part Number: 8M0204647
- Legacy Reference: 26993
- Brand: Quicksilver (Genuine Mercury Marine OEM)
- Type: Lockwasher (.312 in.)
- System: Hardware / Fasteners — Mercury and MerCruiser assemblies
- Application: Carburetor and fuel system service hardware; broad application across Mercury assemblies where the diagram specifies 8M0204647
What This Part Does
This genuine OEM lockwasher prevents fasteners from backing out under vibration and load — a critical function in any marine engine or drive assembly. Lockwashers are single-use hardware; once a lockwasher has been compressed and removed, it will not provide the same clamping retention on reassembly. Always fit a new lockwasher when reassembling any fastener stack that calls for one.
Part 8M0204647 is most commonly called out in carburetor and fuel system service where fasteners and sealing hardware are replaced as a set, though it appears across a range of Mercury and MerCruiser assemblies. Always match by part number from your Mercury diagram — do not substitute by size alone.
Compatible Applications
- Mercury outboard and MerCruiser carburetor assemblies where the diagram specifies 8M0204647
- Fuel system service hardware groups
- Other Mercury or MerCruiser assemblies where the parts diagram calls for this lockwasher
Confirm the exact diagram position using your engine model and serial number before ordering.
When to Replace
- Any time the fastener is removed from the assembly — lockwashers are single-use
- Washer is visibly crushed, deformed, corroded, or missing
- Assembly is being serviced and hardware renewal is specified in the service manual
Installation Notes
- Confirm the exact position in the Mercury parts diagram before installing
- Never reuse a lockwasher that has been previously compressed
- Tighten the associated fastener to the torque specification in the Mercury service manual for the assembly being serviced
Frequently Ordered With
- Mercury MerCruiser Quicksilver Water Tube O-Ring 8M0204645
- Mercury MerCruiser Gasket Inlet Seat 25033
Related Products
Parts Desk Insights
Best used as a direct OEM replacement wherever the Mercury or MerCruiser diagram calls for 8M0204647 — most often seen in carburetor rebuild and fuel system service kits. The most common oversight is reusing the old lockwasher during reassembly: a previously compressed lockwasher loses its spring tension and will not provide reliable clamping retention. Replace it every time. For carburetor service, pair this with the Water Tube O-Ring 8M0204645 and Inlet Seat Gasket 25033 to complete the hardware set in one order.
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.
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