Mercury MerCruiser Propeller Tab Washer 14-34817 | Bravo Two Sterndrive
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Mercury MerCruiser Propeller Tab Washer — Part No. 14-34817
This is the genuine Mercury Marine OEM propeller tab washer for MerCruiser Bravo Two sterndrive propeller assemblies, listed under part number 14-34817 (base number 34817). The tab washer sits between the propeller nut and the aft thrust washer, and its locking tab is bent against the nut after torquing to prevent the prop nut from backing off under load and vibration. It is a small part with a critical job — a missing or weakened tab washer can allow the prop nut to loosen in service, with serious consequences for the propeller assembly and drive.
Part Details
- Part Number: 14-34817
- Base Number: 34817
- Type: Propeller Tab Washer (Locking Washer)
- Function: Locks the propeller nut against the aft thrust washer to prevent loosening under load
- Material: Marine-grade corrosion-resistant construction
- Type: Genuine Mercury Marine OEM replacement washer
Compatible Applications
- MerCruiser Bravo Two sterndrive — propeller nut assembly, where 14-34817 is shown in the parts diagram
Confirm fitment by drive serial number, propeller hardware stack-up, and parts diagram before ordering. Propeller hardware can vary by drive model, prop shaft, thrust washer style, propeller type, and production range.
Propeller Hardware Stack-Up
On Bravo Two drives, the propeller hardware assembly typically includes the propeller nut, tab washer, thrust washers, and the propeller itself. The tab washer must be installed in the correct orientation between the nut and aft thrust washer. After the nut is torqued to Mercury specifications, the locking tab is bent to secure the nut in position. Refer to the Mercury service manual for the exact stack-up and torque specification for the drive serial number being serviced.
Alternate & Superseded Part Numbers
- 14-34817 — current Mercury/MerCruiser formatted number
- 34817 — base part number
Related Parts
Service Interval
Replace this tab washer every time the propeller is removed. Once the locking tab has been bent, the washer should not be reused — a previously bent tab will not lock as reliably on reinstallation. At this price point, replacing it as a matter of course during any prop service is the correct approach.
When to Replace
Replace if the tab washer is bent, cracked, corroded, flattened, missing, or has been previously folded. Also replace any time the propeller is removed for service, inspection, or replacement — do not reuse a tab washer that has already been bent.
Installation Tips
- Install in the correct position between the propeller nut and aft thrust washer — orientation matters
- Torque the propeller nut to the Mercury service specification for the drive before bending the tab
- Bend the locking tab firmly against a flat of the nut after torquing — do not bend before torquing
- Inspect the prop shaft, thrust washers, propeller nut, and propeller hub for wear or damage during service
- Never reuse a tab washer that has already been bent — replace it every time
Technical FAQ
Q: Can I reuse the original tab washer if it looks okay?
A: No. Once the locking tab has been bent, the washer should be replaced. A previously bent tab may not lock as securely on reinstallation, and the risk of the prop nut loosening in service is not worth the cost of a new washer.
Q: What happens if the tab washer is missing or fails?
A: Without a functioning tab washer, the propeller nut can back off under the vibration and load of normal operation. A loose prop nut can allow the propeller to shift on the shaft, causing vibration, damage to the propeller assembly, and potential loss of the propeller.
Q: Does this fit Bravo One or Bravo Three drives?
A: This tab washer is specifically listed for Bravo Two applications. Bravo One and Bravo Three drives use different propeller hardware. Confirm by drive serial number and parts diagram before ordering.
Parts Desk Insights
Best use case: This washer is the right add-to-cart item any time a customer is ordering a propeller, propeller nut, or thrust washer for a Bravo Two drive. It should be replaced every time the prop comes off — it’s inexpensive, easy to overlook, and important enough that skipping it is never worth it. Bundling it with a propeller nut kit is the smart move for complete prop hardware service.
Common mistakes: The most frequent error is reusing the original tab washer because it “still looks fine.” A tab that has already been bent will not lock as reliably the second time. The second common mistake is bending the tab before the nut is fully torqued — the correct sequence is torque first, then bend the tab to lock the nut in position.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.
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