Description
Mercury 8M0071653 Gearcase Special Screw .375-16 UNC
Mercury 8M0071653 is a genuine Mercury gearcase special screw used in compatible Mercury and MerCruiser gearcase assemblies where this exact part number and thread specification are called out by the factory parts diagram.
Key Features
- Genuine Mercury marine replacement gearcase screw
- Special screw for compatible gearcase and lower unit assemblies
- Thread specification: .375-16 UNC
- Direct replacement when Mercury part number 8M0071653 is specified
- Designed for exact part-number matching during gearcase service or reassembly
Fitment / Product Details
- Brand: Mercury
- Part Number: 8M0071653
- Product: Gearcase Special Screw
- Thread: .375-16 UNC
- System: Gearcase / Lower Unit
Gearcase screw fitment depends on engine or drive model, serial number, gearcase configuration, and the exact assembly being serviced. Verify fitment with your Mercury or MerCruiser serial number and factory parts diagram before ordering.
What’s Included
- Mercury 8M0071653 gearcase special screw
Washers, seals, gearcase components, tools, thread locker, and related hardware are not included unless listed separately.
Why You Should Buy
Gearcase hardware should match the correct thread, length, and Mercury part number. Using the correct special screw helps support proper gearcase service and reliable lower unit assembly on compatible Mercury marine applications.
Common Applications
Used in compatible Mercury and MerCruiser gearcase assemblies where the factory parts diagram calls for special screw 8M0071653.
FAQ
Is this a standard hardware-store screw?
No. This is a Mercury gearcase special screw and should be matched by part number and thread specification.
Does this include a washer or seal?
No. This listing is for the special screw only unless other parts are specifically listed.
Can Wakeboss help confirm fitment?
Yes. Send your engine or drive model and serial number through Ask a Parts Pro and we can help check the correct gearcase diagram.

