90171-18M04 Yamaha Castle Nut 115HP | Genuine Used Part
90171-18M04 Yamaha Castle Nut 115HP | Genuine Used Part
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🔧 Product Description
Genuine Yamaha Propeller Castle Nut - Part Number: 90171-18M04-00
A genuine Yamaha castellated propeller-shaft nut used on a broad range of medium and large outboards.
The nut secures the propeller and spacer stack to the propeller shaft and is locked by a cotter pin through the castellations. Although listed as a 115HP part, it is documented across Yamaha engines from approximately 115HP to 350HP.
⚙️ Key Features
- Genuine Yamaha propeller-shaft castle nut
- Correct full part number 90171-18M04-00
- Castellated design accepts a locking cotter pin
- Used on standard- and counter-rotation gearcases
- Broad two-stroke and four-stroke compatibility
- Available within Yamaha propeller hardware kits
🚤 Compatibility
Documented across selected
- Yamaha 115HP and 130HP V4 two-strokes
- Yamaha 140HP, 150HP, 175HP and 200HP outboards
- Yamaha 220HP, 225HP and 250HP outboards
- Yamaha 300HP and 350HP outboards
- Two-stroke, HPDI and four-stroke engine families
- Standard- and counter-rotation lower units
- 1984 115ETLN / 115ETXN
- 1989 150ETXF
- Later F115-F350 and V6/V8 applications where 90171-18M04-00 is specified
- Fitment Requirement: Confirm propeller-shaft thread and hardware stack
🔌 Function
The nut clamps the propeller, thrust washers and spacers onto the propeller shaft. The cotter pin prevents the nut from rotating loose during operation.
⚠️ Common Signs of Failure
- Castellations are damaged
- Threads are stretched, crossed or corroded
- Cotter-pin hole will not align at the specified torque
- Propeller has axial movement
- Nut has been damaged by incorrect tools
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 90171-18M04-00 current documented Yamaha castle-nut reference
- No direct supersession confirmed
OEM / Related Numbers
- 90171-18M04-00
- 92990-18200-00 related propeller washer
- 91490-40030-00 related cotter pin
- 688-45997-01-00 related rear spacer
- 6G5-W4599-00-00 Yamaha propeller nut and spacer kit
Aftermarket / Verified Equivalents
- SEI Marine replacement for Yamaha 90171-18M04-00
- GLM 22221 cross-reference shown in propeller-hardware catalogues
- OMC / Johnson 3852020 is shown as a related cross-reference in some propeller-hardware catalogues; confirm thread and castellations before use
- Sierra 18-3792 may suit documented Yamaha propeller-shaft applications; verify shaft thread before installation
- Aftermarket brass or stainless castle nuts must match thread, height and cotter-pin alignment
📦 Condition
- Genuine used part
- In good working condition unless otherwise stated
- Inspect threads and castellations before reuse
- Install with the correct washer, spacer and new cotter pin
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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