Mercury MerCruiser OEM Bravo III Aft Propeller Nut 862907 | Rear Prop Nut | Bravo III X XR Zeus
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Mercury MerCruiser OEM Bravo III Aft Propeller Nut — Part 862907
- Part Number: 862907
- Full Catalog Number: 11-862907
- Brand: Mercury Marine / MerCruiser (Genuine OEM)
- Official Product Type: Propeller Hardware — Aft / Rear Propeller Nut
- System: Sterndrive — Bravo III dual-prop propeller shaft, aft (rear) propeller position
- Diagram Position: Aft propeller nut on the Bravo III rear propeller shaft assembly
- GTIN / UPC: 745061477759
- Qty Required: 1 per applicable assembly
- Weight: approx. 0.1 kg
Position matters: The Bravo III uses two different propeller nuts — 862907 is specifically the aft (rear) propeller nut. The forward propeller uses a different nut: 8M0105210. Do not interchange them.
What It Does
The 862907 is the genuine OEM aft propeller nut used to secure the rear propeller on the aft propeller shaft of Bravo III dual-prop sterndrives and related Mercury Marine applications. Mercury parts diagrams identify 862907 specifically as the aft prop nut, distinct from the forward propeller nut used on the same drive. It also appears in selected Zeus 3000 and Bravo-family configurations depending on gearcase and propeller arrangement. Always confirm against the drive serial number and the specific propeller assembly diagram before ordering.
Compatible Applications
Confirm fitment by drive serial number and the specific Mercury propeller assembly diagram before ordering. Front and rear propeller positions use different retaining hardware on Bravo III drives.
- Bravo III sterndrive — aft propeller position
- Bravo III X sterndrive — aft propeller position
- Bravo III XR sterndrive — aft propeller position
- Selected Zeus 3000 applications
- Related Bravo Three diesel-propeller configurations — selected assemblies
Not sure it fits? Send us your MerCruiser drive serial number before ordering.
Bravo III Aft Propeller Assembly Components
Mercury Bravo III propeller diagrams show 862907 alongside the following hardware. Inspect all thrust and shaft components while the propellers are off — these are sold separately:
- 805100 — Aft thrust washer
- 805101T — Forward thrust washer
- 8M0105210 — Forward propeller nut (different part — do not substitute for 862907)
- Applicable propeller-shaft anode hardware
Part Numbers
- 862907 — Mercury Marine OEM part number
- 11-862907 — Full Mercury catalog number
No separate superseding Mercury part number is confirmed in current parts references. Order 862907 / 11-862907.
When to Replace
Replace the aft propeller nut when:
- The threads are worn, damaged, or corroded
- The wrench flats are rounded or damaged from previous removal
- The nut no longer threads smoothly onto the propeller shaft
- It has been damaged during propeller removal
- The nut is missing during propeller service
- Corrosion or impact damage makes proper torquing unreliable
Inspect the propeller-shaft threads at the same time — a new nut will not correct damaged shaft threads, and a nut installed on a damaged shaft can back off under load.
Service Interval
Inspect the aft propeller nut and thrust washer every time the rear propeller is removed. Replace the nut if threads show any corrosion, deformation, or damage. On saltwater boats, the nut and thrust washer should be inspected at least annually as part of propeller-shaft and anode service. Do not reuse a nut with rounded flats or damaged threads — incorrect torque on the aft propeller can result in propeller movement or loss on the water.
Installation Notes
- Confirm 862907 is the correct aft / rear prop nut for your drive by serial number and diagram — the forward and aft prop nuts are not interchangeable on the Bravo III
- Inspect the propeller-shaft threads for corrosion or damage before installing the nut
- Inspect the aft thrust washer (805100) and replace if worn or deformed
- Confirm the aft propeller is correctly seated against the thrust washer before threading the nut
- Lubricate the shaft as specified by Mercury before nut installation
- Tighten to the torque value specified in the applicable Mercury Bravo III service procedure — do not estimate torque on propeller retaining hardware
- Do not use the forward propeller nut (8M0105210) in the aft position or vice versa
Technical FAQ
Q: What is the difference between 862907 and 8M0105210?
862907 is the aft (rear) propeller nut for the Bravo III dual-prop system. 8M0105210 is the forward propeller nut. They are different parts and are not interchangeable. Confirm which position you need from the Mercury Bravo III propeller assembly diagram for your drive before ordering.
Q: Does 862907 fit all Bravo III drives?
It fits Bravo III, Bravo III X, and Bravo III XR in the aft propeller position, as well as selected Zeus 3000 applications. Because Bravo III drives have undergone production changes, confirm the part against the propeller assembly diagram for your specific drive serial number before ordering.
Q: Can I reuse the aft prop nut after removing the propeller?
Inspect before reusing. If the threads are in good condition, the wrench flats are not rounded, and the nut torques smoothly, it can generally be reused. Replace it if there is any thread damage, corrosion, or deformation. On saltwater boats especially, replace the nut at each annual propeller service.
Q: My propeller was lost — could the nut be the cause?
A backed-off or incorrectly torqued aft prop nut is a possible cause of propeller loss. Inspect the propeller-shaft threads and the remaining thrust hardware for damage. If the shaft threads are damaged, they must be addressed before reinstalling a propeller. Always torque the aft prop nut to the Mercury specification using a calibrated torque wrench.
Parts Desk Insights
The single most important thing with 862907 is the front-versus-rear distinction. On a Bravo III, customers regularly call in for “the prop nut” without specifying which one, and ordering the wrong one means waiting for the correct part before the boat goes back in the water. 862907 is the aft / rear nut; 8M0105210 is the forward nut. Confirm the position from the diagram before ordering. The other issue that comes up is prop loss traced back to an undertorqued nut — the Bravo III prop nut torque spec is specific and should be confirmed from the Mercury service manual, not estimated by feel. If a customer had a prop come off, inspect the shaft threads carefully before putting new hardware on.
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.
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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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