Mercury MerCruiser Quicksilver Exhaust Mounting Screw (3/8-16 x 1-1/4 in.) 58640
In stock items ship same or next day.
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Product Description
Mercury 58640 is a 3/8-16 x 1-1/4-inch screw used at specified MerCruiser exhaust-pipe and exhaust-elbow mounting points. Legacy parts catalogs identify it as an elbow-to-gimbal-housing fastener; the same part number also appears in some Bravo universal-joint and shifter assemblies.
Key Features
- Original catalog number: 10-58640
- Thread: 3/8-16; length: 1-1/4 in.
- Current replacement reference: 10-8M0113174.
Engine Compatibility & Fitment Notice
Match the original screw number and assembly callout to the engine or drive serial number. Exhaust assemblies can use different fastener lengths at neighboring positions; use the service manual for the specified washer arrangement and tightening procedure.
Alternate / Superseded Part Numbers
Original 10-58640 is superseded by 10-8M0113174; 10-8M0067652 is an intermediate replacement reference.
When This Part Needs Replacement
Replace damaged or heavily corroded mounting screws when servicing the exhaust-pipe joint or the specified drive assembly.
Installation Notes
Check the adjoining fastener callouts for different lengths, and follow the relevant exhaust or drive tightening procedure.
Mercury Parts Finder
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Parts Desk Insight
The verified replacement is 8M0113174, but the original 58640 stock number remains useful when matching older exhaust diagrams.
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
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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.