Mercury - Needle Roller Bearing - 30956T
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The Mercury Quicksilver Needle Roller Bearing 31-30956T is an OEM-style precision bearing used in compatible Mercury, Mariner, and MerCruiser lower-unit gearcase assemblies. This bearing helps reduce rotating friction and support shaft operation inside the gear housing under load.
Key Features
- Mercury/Quicksilver needle roller bearing
- Part number: 31-30956T
- Also referenced as 30956T
- Lower-unit gearcase bearing component
- Supports rotating shaft stability inside the gear housing
- GTIN / UPC: 745061134867
Engine Compatibility
Used on select Mercury and Mariner outboards, including various 45 Jet, 50 HP, 55 HP, 60 HP, and mid-to-high horsepower applications from 65 HP through 175 HP. Also commonly used on select MerCruiser Alpha One Generation II lower-unit drive assemblies.
Serial Number Fitment Notice
Verify fitment by engine or drive serial number, lower-unit model, gearcase diagram, and original bearing part number before ordering. Gearcase bearings can vary by shaft size, bearing location, gear housing style, and production range.
When This Part Needs Replacement
Replace this needle roller bearing if it is worn, noisy, pitted, scored, seized, loose in the housing, contaminated by water intrusion, or damaged during lower-unit disassembly. It should also be inspected during gear, propeller shaft, driveshaft, seal, or bearing-carrier service.
Installation Notes
Installation requires lower-unit disassembly and proper bearing removal/installation tools. Inspect the shaft surface, gear housing bore, seals, gears, and lubricant condition during service. Replace any related worn components and refill the gearcase with the correct lubricant after reassembly.
Alternate/Superseded Part Numbers
Primary Mercury references: 31-30956T and 30956T. Common aftermarket interchanges include Sierra Marine 18-1158, SEI Marine 93-102-12, and GLM 11410.
Parts Desk Insight
Lower-unit bearings are not parts to match by appearance alone. Even a small difference in bearing size or gearcase location can affect shaft alignment, noise, and gear life, so matching by serial number and lower-unit diagram is the safest route.
Shipping: Locally warehoused, may take up to 3 days to ship. ⚓
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.