Mercury MerCruiser Screw Kit 8M0058388
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Restore proper gearcase sealing during lower unit service with the Mercury MerCruiser Screw Kit 8M0058388. This genuine Mercury Marine OEM screw kit is designed for gearcase drain and vent ports on Mercury outboards and MerCruiser sterndrives.
The kit includes replacement drain and vent screws used when servicing gear lube in the lower unit. Using OEM Mercury hardware ensures correct thread fitment, proper sealing, and reliable performance in harsh marine environments where corrosion resistance and sealing integrity are critical.
Key Features
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Genuine Mercury Marine OEM screw kit
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Designed for gearcase drain and vent plug replacement
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Precision threads for proper OEM fit and sealing
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Corrosion-resistant construction for marine environments
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Helps maintain proper gear lube containment
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Direct replacement for worn or damaged drain screws
Part Details
OEM Part Number: 8M0058388
Mercury Reference Number: 22-8M0058388
Product Type: Gearcase drain and vent screw kit
Thread Size: 3/8-16
Application: Gearcase drain and vent ports
Typical Packaging: Screw kit for gearcase service
Compatible Mercury & MerCruiser Engines
Used on many gearcases with standard 3/8-16 drain and vent screws, including:
Mercury Outboards
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Mercury 2.5HP – 400HP outboards
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Mercury Two-Stroke outboards
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Mercury FourStroke outboards
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Mercury Pro XS outboards
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Mercury Verado outboards
MerCruiser Sterndrives
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Alpha One
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Alpha One Gen II
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Bravo One
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Bravo Two
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Bravo Three
Function
The drain and vent screws are used to seal the gearcase after servicing gear lube. They allow technicians to safely drain old lubricant and refill the gearcase while maintaining a watertight seal once service is complete.
Replacing worn screws helps:
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Prevent gear oil leaks
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Maintain proper gearcase sealing
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Protect internal gears from water intrusion
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Ensure reliable gearcase lubrication
Important Compatibility Note
Gearcase drain screw sizes and designs can vary depending on engine model, gearcase type, and production year. Always verify compatibility using the engine or sterndrive serial number before ordering to ensure the correct screw kit.
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.