Mercury Quicksilver — Thumb Screw Washer — 73719, Replaced by 818884
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Mercury Quicksilver Thumb Screw Washer 73719
Mercury Quicksilver 73719 is an OEM thumb screw washer used in the clamp-bracket assembly on various Mercury outboard engines. It fits the transom clamp thumb-screw assembly and is retained by the associated attaching or shoulder screw. Mercury has superseded part number 73719 to current replacement 818884.
Compatible Applications
- Select Mercury 4.5 HP outboards
- Select Mercury 9.9 HP outboards
- Select Mercury 20 HP and Model 200 applications
- Additional Mercury outboards whose clamp-bracket diagram specifies 73719 or replacement 818884
Fitment notice: Confirm the engine serial number and clamp-bracket diagram before ordering. Mercury used several thumb-screw washer and retaining arrangements across similar clamp brackets.
Part Details
- Original part number: 73719
- Original catalog number: 12-73719
- Current replacement: 818884
- Replacement catalog number: 12-818884
- Brand: Mercury Quicksilver
- Product type: Transom clamp thumb screw washer
- Typical quantity: Two washers per applicable clamp-bracket assembly
- Condition: New
Key Features
- Genuine OEM clamp-bracket component
- Used in the transom clamp thumb-screw assembly
- Current service replacement is Mercury 818884
- Application-specific washer rather than general-purpose flat hardware
When to Replace This Washer
Replace the washer if it is missing, bent, cracked, distorted, heavily worn, damaged around the retaining-screw attachment point, or no longer seats correctly after removal. A damaged washer can prevent the clamp screw from bearing evenly against the transom.
Installation Notes
Inspect the complete thumb-screw assembly while servicing this washer. Associated diagrams commonly show it with attaching or shoulder screw 768042 and an application-specific thumb-screw assembly such as 92767A1. Confirm the exact clamp-bracket configuration before replacing individual components.
Technical FAQ
Can original part 73719 still be used for lookup?
Yes. Mercury superseded 73719 to current replacement 818884, so either number may appear in application references.
Is this a general-purpose flat washer?
No. It is a component of specified Mercury outboard transom clamp thumb-screw assemblies.
How many washers are required?
Many applicable diagrams show two washers per clamp-bracket assembly. Confirm the quantity on the exact serial-specific diagram.
Parts Desk Insights
Best use case: Replacing missing, distorted, or worn thumb-screw washers when the clamp-bracket diagram specifies 73719 or current replacement 818884.
Most common mistake: Ordering by appearance alone or treating it as a standard flat washer. Similar clamp assemblies can use different retaining hardware.
Fitment guidance: Check the engine serial number, clamp-bracket diagram, required quantity, retaining screw, and complete thumb-screw assembly before ordering.
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.