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Mercury Gearcase Hardware
Mercury Verado DFI Gearcase Mounting Fastener 8M0084475
Mercury OEM 8M0084475 is a mounting fastener used on select Mercury outboard lower unit, driveshaft housing, and propeller-related assemblies. This hardware secures critical components throughout the gearcase and midsection.
Mercury 8M0084475 supersedes previous part numbers 8M0033179, 8M0142580, and 84036240. These updated part numbers maintain the same fit while reflecting Mercury engineering improvements or production updates. Always verify compatibility using your engine serial number and OEM parts diagram.
Compatible Applications
| Brand | Engine / System | Application | Fitment Note |
|---|---|---|---|
| Mercury / Mariner | Select 2.5L DFI and Optimax models | Gearcase and driveshaft housing hardware | Verify by serial number and parts diagram |
| Mercury Racing | Sport XS and high-performance outboards | Lower unit mounting hardware | Used where OEM number 8M0084475 is specified |
| Mercury Verado | Select Verado gearcases | Propeller shaft and gearcase assemblies | Confirm by engine serial number |
Important Fitment Note
This fastener is used in multiple Mercury gearcase and driveshaft housing assemblies. Although the part numbers supersede one another, always verify compatibility using your engine serial number and OEM parts diagram before ordering.
OEM & Cross Reference Numbers
| Current Mercury OEM Number | 8M0084475 |
| Superseded Mercury Numbers | 8M0033179, 8M0142580, 84036240 |
| Description | Mounting fastener (M8 x 40 class hardware) |
What This Part Is Used For
This OEM mounting fastener secures critical components within the lower unit, driveshaft housing, and propeller-related assemblies. Proper fastener strength and fit are essential for maintaining alignment and structural integrity in high-load marine applications.
Replace damaged, corroded, stretched, or missing hardware during gearcase repairs or rebuilds. Using the correct OEM fastener helps ensure proper torque retention and reliable long-term service.
Key Features and Benefits
- Current Mercury OEM part number 8M0084475
- Replaces Mercury 8M0033179, 8M0142580, and 84036240
- Used in select lower unit, driveshaft housing, and propeller assemblies
- Common on select Optimax, Sport XS, Verado, and other Mercury applications
- Designed for demanding marine environments and proper OEM fit
- Ideal replacement during lower unit service and gearcase rebuilds
FAQ
What does Mercury part 8M0084475 fit?
It is used in select Mercury lower unit, driveshaft housing, and propeller-related assemblies, including some Optimax, Sport XS, and Verado applications.
What part numbers does it replace?
Mercury 8M0084475 supersedes 8M0033179, 8M0142580, and 84036240.
Is this an M8 x 40 fastener?
This hardware is commonly associated with M8 x 40 mounting applications. Always verify the exact fastener required using your OEM parts diagram.
Why should OEM fasteners be replaced?
Critical mounting hardware can stretch, corrode, or lose clamping force over time. Using the correct OEM replacement helps maintain proper torque and component alignment.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
Mercury mounting fastener, Mercury gearcase screw, Mercury lower unit hardware, Mercury driveshaft housing fastener, Mercury propeller hardware, Verado mounting bolt, Sport XS hardware, Optimax lower unit fastener, Mercury OEM mounting hardware
Searchable Part Numbers
8M0084475, 8M0033179, 8M0142580, 84036240
8M0084475
8M0142580
84036240
8204981
8301231
Mercury Propeller Hardware
Mercury Heavy Duty Propeller Washer 8M0204711
Mercury 8M0204711 is a propeller washer used during propeller installation on select Mercury outboards, MerCruiser sterndrives, and Mercury Racing applications. It is commonly used as part of the propeller hardware stack to help retain the prop nut on the shaft.
This washer supersedes Mercury part numbers 8403831 and 840383 and may also be shown as 12-8M0204711. Fitment varies by gearcase, drive, prop shaft size, and propeller hardware setup, so verify by model and serial number before ordering.
Compatible Applications
| Brand | Engine / System | Application | Fitment Note |
|---|---|---|---|
| Mercury | Select outboards | Propeller shaft hardware | Common on larger or heavy-duty prop shaft applications where this washer is listed |
| Mercury Racing | Select Sport Master and Torque Master style gearcases | Prop nut retaining washer | Often associated with heavy-duty propeller hardware and larger prop shafts |
| MerCruiser / Mercury Racing | Select performance sterndrives | Propeller installation hardware | Common on Bravo XR and similar heavy-duty prop shaft applications where specified |
Important Fitment Note
Propeller washers vary by prop shaft size, gearcase, drive type, and propeller hardware kit. Always confirm compatibility using your engine or drive serial number, prop shaft size, and existing hardware before ordering.
OEM & Cross Reference Numbers
| Current Mercury Number | 8M0204711, 12-8M0204711 |
| Superseded Mercury Numbers | 8403831, 840383 |
| Description | Propeller washer / retaining washer |
What This Part Is Used For
This propeller washer is installed with the propeller hardware on select Mercury and MerCruiser propeller shafts. It helps support proper prop nut retention and is often used as part of the propeller hardware kit.
Replace damaged, bent, corroded, or missing propeller washers during prop service. Reusing worn prop hardware can increase the chance of improper nut retention or hardware loosening during operation.
Key Features and Benefits
- Current Mercury number 8M0204711
- Also listed as 12-8M0204711
- Supersedes Mercury 8403831 and 840383
- Used as propeller retaining hardware on select Mercury and MerCruiser applications
- Common service item during propeller changes, gearcase service, or prop hardware replacement
- Helps maintain proper prop nut retention when installed with the correct hardware stack
FAQ
Is 8M0204711 the same as 8403831 and 840383?
Yes. Mercury 8M0204711 is the current number and supersedes 8403831 and 840383.
Where does this washer install?
It installs on the propeller shaft as part of the propeller hardware stack and helps retain or lock the prop nut, depending on the application.
Does this fit all Mercury propellers?
No. Fitment depends on the gearcase, drive model, prop shaft size, and hardware kit. Verify your serial number and existing prop hardware before ordering.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
Mercury propeller washer, Mercury prop washer, Mercury retaining washer, Mercury tab washer, MerCruiser propeller washer, Mercury Racing prop hardware, Sport Master prop washer, Torque Master prop washer, Bravo XR prop washer, heavy duty prop shaft washer, prop nut washer
Searchable Part Numbers
8M0204711, 12-8M0204711, 8403831, 840383
840383
8403831
864907T
8M0118573
8M0118573
855833A02
855833A02
Mercury Engine Cradle and Mounting
Mercury 8M0142936 Front Cradle Cover
Mercury 8M0142936 is a front cradle cover used in the engine cradle or mounting area on select Mercury 4.6L V8 outboards with AMS, including 250, 300, and 300R applications.
This cover helps protect and finish the front cradle area. Because this is a model and serial specific structural or rigging-area part, always confirm fitment by engine serial number before ordering.
Compatible Applications
| Brand | Engine / System | Application | Fitment Note |
|---|---|---|---|
| Mercury | 4.6L V8 AMS Outboards | 250, 300, and 300R models with Advanced Midsection | Verify by serial number and engine configuration |
| Mercury Racing | V8 AMS Performance Applications | Front cradle / mounting cover location | Confirm with parts diagram for your serial number |
Important Fitment Note
Always confirm compatibility using your engine serial number, model, and existing part number before ordering. This part is specific to certain Mercury 4.6L V8 AMS cradle and mounting configurations.
OEM & Cross Reference Numbers
| Mercury OEM Number | 8M0142936 |
| Description | Cover, Cradle Front |
| Other References | Front cradle cover, mounting cover, cradle front cover |
What This Part Is Used For
The front cradle cover is used in the engine cradle or mounting area of select Mercury V8 AMS outboards. It helps cover, shield, or finish the front cradle section depending on the engine configuration.
Replacement may be needed if the original cover is cracked, missing, damaged during service, or no longer securing properly in the cradle area.
Key Features and Benefits
- Genuine Mercury OEM part number 8M0142936
- Front cradle cover for select Mercury 4.6L V8 AMS applications
- Used in the engine cradle or mounting cover area
- Helps protect and finish the front cradle section
- Best matched by engine serial number and parts diagram
FAQ
What is Mercury 8M0142936?
8M0142936 is a Mercury front cradle cover used in the engine cradle or mounting area on select Mercury V8 AMS outboards.
Does this fit all Mercury V8 outboards?
No. This part is associated with select 4.6L V8 AMS applications, including 250, 300, and 300R models. Verify by serial number before ordering.
Is this a service maintenance part?
This is not a routine maintenance part. It is normally replaced when the original cradle cover is missing, cracked, damaged, or removed during repair.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
Mercury front cradle cover, Mercury cradle front cover, Mercury mounting cover, Mercury AMS cradle cover, 4.6L V8 AMS cover, Mercury 300R front cradle cover, Mercury V8 mounting area cover
Searchable Part Numbers
8M0142936, Mercury 8M0142936