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Fits Select Mercury 25-70HP Gearcase Applications
Designed for Mercury and Mariner lower unit bearing carrier assemblies. The Mercury 21700 Bearing, also listed as 31-21700, is a needle / roller bearing used in the gearcase bearing carrier area to support the propeller shaft.
Compatibility
This bearing is used across many Mercury and Mariner small to midrange outboard gearcases. OEM where-used data shows applications across multiple 25-70HP gearcase families, including 2-stroke, 4-stroke, BigFoot, and Jet models.
Application Chart
| Brand | Engine Family | Horsepower | System | Component |
|---|---|---|---|---|
| Mercury / Mariner | Small 4-Stroke Outboards | 25-30 HP | Gearcase / Lower Unit | Bearing Carrier / Prop Shaft Bearing |
| Mercury / Mariner | 2-Cyl / 3-Cyl Outboards | 35-40 HP | Gearcase / Lower Unit | Bearing Carrier / Prop Shaft Bearing |
| Mercury / Mariner | 3-Cyl / 4-Cyl Outboards | 45-60 HP | Gearcase / Lower Unit | Bearing Carrier / Prop Shaft Bearing |
| Mercury / Mariner | BigFoot / 4-Stroke Models | 40-60 HP | Gearcase / Lower Unit | Bearing Carrier / Prop Shaft Bearing |
| Mercury / Mariner | 70HP 3-Cyl Outboards | 70 HP | Gearcase / Lower Unit | Bearing Carrier / Prop Shaft Bearing |
| Mercury / Mariner | Jet Models | 30-45 Jet | Gearcase / Jet Drive | Bearing Carrier / Prop Shaft Bearing |
Always confirm compatibility using your engine serial number, gearcase type, and existing part number before ordering.
Part Numbers & Cross References
| Reference Type | Part Number |
|---|---|
| Mercury OEM Part | 21700 |
| Mercury OEM Part | 31-21700 |
| Cross Reference # | 18-1095 |
| Cross Reference # | 93-263-12 |
| Cross Reference # | 11428 |
What This Part Is Used For
This bearing is used in the lower unit bearing carrier to support the propeller shaft. A properly functioning bearing helps maintain smooth prop shaft rotation and proper gearcase operation.
Bearings are commonly inspected or replaced during lower unit rebuilds, bearing carrier service, prop shaft repair, or when gearcase noise, vibration, or wear is found.
Frequently Asked Questions
What does Mercury 21700 fit?
This bearing fits select Mercury and Mariner small to midrange gearcases, commonly in the 25-70HP range. Always verify by serial number and gearcase diagram.
Where is this bearing used?
It is used in the lower unit bearing carrier area to support the propeller shaft.
Is 21700 the same as 31-21700?
Yes. Mercury commonly lists this bearing as 31-21700.
When should this bearing be replaced?
Replace it during lower unit rebuilds or when wear, noise, corrosion, or prop shaft bearing damage is found.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer or technician? We offer dealer pricing for qualified businesses.
Shipping Policy
- Free shipping on orders over $100 (continental U.S.)
- Ships via UPS, USPS, and FedEx
- 5:30 PM EST daily cutoff
- Typical delivery 1–5 business days
30-Day Return Policy
- Returns within 30 days
- Items must be unused and in original packaging
- Return authorization is required before sending items back
Contact Us
Phone: 941-721-3000
Searchable Part Numbers
Part Number: 21700
Cross Reference #: 31-21700, 18-1095, 93-263-12, 11428
Common Search Terms: Mercury 21700 bearing, Mercury 31-21700 bearing, Mercury bearing carrier bearing, Mercury prop shaft bearing
848840A1
848840T1
818290A8
818290T8
0350038
18-2343
32800
346546
350038
9-78108
92721
Mercury Racing / Performance Outboard Steering
Mercury 848125 Spiral Lock Retaining Ring
The Mercury 848125 Spiral Lock Retaining Ring, also referenced as 53-848125, is a genuine OEM-style retaining ring used in select Mercury and Mariner high-performance outboard steering and swivel bracket assemblies.
This part is commonly found on performance and racing outboards, including select Pro Max, Super Mag, XS, Sport XS, Offshore, 300X, and 300XS applications. Exact fitment should always be verified by engine serial number and parts diagram before ordering.
Compatible Applications
| Brand | Engine Family | Application | System |
|---|---|---|---|
| Mercury / Mariner | 2.5L Performance | Pro Max, Super Mag, EFI, Offshore and related models | Swivel bracket / steering arm assembly |
| Mercury Racing | 200XS / 225X | Select DFI and performance models | Steering / swivel components |
| Mercury Racing | 250XS / 250 Sport XS | Select 3.0L DFI performance models | Steering / swivel components |
| Mercury Racing | 300 Pro Max / 300X / 300XS | Select 3.0L and 3.2L high-performance models | Steering / swivel components |
Important Fitment Note
Mercury 848125 is used on select high-performance and racing outboard applications. Because steering and swivel bracket parts can vary by model year, serial range, and bracket configuration, always confirm fitment using your engine serial number and OEM parts diagram before ordering.
OEM & Cross Reference Numbers
| Mercury OEM Part | 848125 |
|---|---|
| Mercury Reference | 53-848125 |
| Part Type | Spiral lock retaining ring |
| Common System | Swivel bracket / steering arm assembly |
What This Part Is Used For
A spiral lock retaining ring is used to hold components securely in place inside the steering or swivel bracket assembly. On high-performance Mercury outboards, small retaining parts like this are important for keeping steering and bracket components properly retained during operation.
This part is commonly replaced during steering arm, swivel bracket, clamp bracket, or heavy-duty steering service when the original retaining ring is removed, damaged, corroded, or no longer reusable.
Key Features and Benefits
- OEM-style spiral lock retaining ring for Mercury performance outboards.
- Commonly referenced as Mercury 848125 and 53-848125.
- Used in select steering arm and swivel bracket assemblies.
- Supports service on Pro Max, Super Mag, XS, Sport XS, Offshore, 300X, and 300XS style applications where specified by diagram.
- Small but important retaining component for bracket and steering service.
FAQ
What is Mercury 848125?
Mercury 848125, also shown as 53-848125, is a spiral lock retaining ring used in select Mercury outboard steering and swivel bracket assemblies.
What engines does this retaining ring fit?
It is used on select Mercury and Mariner high-performance outboards, commonly in 2.5L, 3.0L, and 3.2L performance families including Pro Max, Super Mag, XS, Sport XS, Offshore, 300X, and 300XS style applications.
Where is this part used?
It is commonly found in the swivel bracket and steering arm assembly, including short or heavy-duty bracket configurations where specified by the OEM parts diagram.
Should I verify fitment before ordering?
Yes. These assemblies can vary by serial number and bracket configuration, so confirm using your engine serial number and OEM diagram 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 spiral lock retaining ring, Mercury Racing retaining ring, Mercury swivel bracket retaining ring, Mercury steering arm retaining ring, Pro Max retaining ring, 300X retaining ring, 300XS retaining ring.
Searchable Part Numbers
848125, 53-848125
33491
33491