Yamaha Motors

Castle Nut 90171-16011-00

Country of Origin:

Japan

Satisfaction rating

(28 Ratings)

Genuine OEM product

Product	Price	Rating	Comment
Yamaha Motors 90171-16011-00 Castle Nut (viewing this product) Genuine OEM product	$15.59~~$19.49~~ In stock 5+ in stock	Best	Japan-made genuine Yamaha castle nut with clean thread form and evenly cut castellations (slots) for the cotter pin. OEM sourcing provides the highest confidence in correct fit, alloy control, and corrosion resistance on the prop shaft.
Japan-made genuine Yamaha castle nut with clean thread form and evenly cut castellations (slots) for the cotter pin. OEM sourcing provides the highest confidence in correct fit, alloy control, and corrosion resistance on the prop shaft.
GLM Marine 21231 Prop Nut (21231) Aftermarket product	$13.79~~$17.24~~ In stock Only 2 remaining	Better	Taiwan-made brass slotted prop nut built to replace Yamaha 90171-16011, with a comparable hex profile, thread cut, and six castellations. Finish and machining look consistent, but it is not OEM-sourced and comes from a different factory than Yamaha.
Taiwan-made brass slotted prop nut built to replace Yamaha 90171-16011, with a comparable hex profile, thread cut, and six castellations. Finish and machining look consistent, but it is not OEM-sourced and comes from a different factory than Yamaha.
Recmar REC90171-16011 NUT (REC90171-16011) Aftermarket product	$7.77~~$8.63~~ In stock 5+ in stock	Good	RECmar China-made castle nut cross-referenced to Yamaha 90171-16011, with well-defined castellations and clean threads in the photos. Likely a workable replacement, but not an exact OEM match and long-term material consistency is less certain than Yamaha.
RECmar China-made castle nut cross-referenced to Yamaha 90171-16011, with well-defined castellations and clean threads in the photos. Likely a workable replacement, but not an exact OEM match and long-term material consistency is less certain than Yamaha.
Parsun T40-04000021 SLOTTED NUT Aftermarket product	$9.90 In stock 5+ in stock	Good	Parsun genuine part made in China; visually it has uniform slot spacing and clean internal threads similar to the OEM nut. It’s a functional substitute, but the different sourcing provides less assurance on alloy spec and tolerance control than the Japan-made Yamaha part.
Parsun genuine part made in China; visually it has uniform slot spacing and clean internal threads similar to the OEM nut. It’s a functional substitute, but the different sourcing provides less assurance on alloy spec and tolerance control than the Japan-made Yamaha part.
Recmar PAT40-04000021 NUT (PAT40-04000021) Aftermarket product	$9.26~~$10.29~~ Cross Ship Leaves in 3-5 days Please update to verify the current stock status. Product availability has not been checked in more than 7 days.	Unknown	We are working hard to determine a rating based on all available information, including product and manufacturing specifications.
We are working hard to determine a rating based on all available information, including product and manufacturing specifications.

$15.59~~$19.49~~

You save 20%($3.90)

-20%

In stock

5+ in stock

Qty

Guaranteed fitment for 30 different models

This is an OEM part manufactured by Yamaha Motors

30 day return policy

PartX Alternatives — This part: Best

Ratings provided by PartX™

Product	Price	Rating	Comment
Yamaha Motors 90171-16011-00 Castle Nut (viewing this product) Genuine OEM product	$16.06~~$18.90~~ In stock 5+ in stock	Best	Japan-made genuine Yamaha castle nut with clean thread form and evenly cut castellations (slots) for the cotter pin. OEM sourcing provides the highest confidence in correct fit, alloy control, and corrosion resistance on the prop shaft.
Japan-made genuine Yamaha castle nut with clean thread form and evenly cut castellations (slots) for the cotter pin. OEM sourcing provides the highest confidence in correct fit, alloy control, and corrosion resistance on the prop shaft.
GLM Marine 21231 Prop Nut (21231) Aftermarket product	$13.79~~$17.24~~ In stock Only 2 remaining	Better	Taiwan-made brass slotted prop nut built to replace Yamaha 90171-16011, with a comparable hex profile, thread cut, and six castellations. Finish and machining look consistent, but it is not OEM-sourced and comes from a different factory than Yamaha.
Taiwan-made brass slotted prop nut built to replace Yamaha 90171-16011, with a comparable hex profile, thread cut, and six castellations. Finish and machining look consistent, but it is not OEM-sourced and comes from a different factory than Yamaha.
Recmar REC90171-16011 NUT (REC90171-16011) Aftermarket product	$7.77~~$8.63~~ In stock 5+ in stock	Good	RECmar China-made castle nut cross-referenced to Yamaha 90171-16011, with well-defined castellations and clean threads in the photos. Likely a workable replacement, but not an exact OEM match and long-term material consistency is less certain than Yamaha.
RECmar China-made castle nut cross-referenced to Yamaha 90171-16011, with well-defined castellations and clean threads in the photos. Likely a workable replacement, but not an exact OEM match and long-term material consistency is less certain than Yamaha.
Parsun T40-04000021 SLOTTED NUT Aftermarket product	$9.90 In stock 5+ in stock	Good	Parsun genuine part made in China; visually it has uniform slot spacing and clean internal threads similar to the OEM nut. It’s a functional substitute, but the different sourcing provides less assurance on alloy spec and tolerance control than the Japan-made Yamaha part.
Parsun genuine part made in China; visually it has uniform slot spacing and clean internal threads similar to the OEM nut. It’s a functional substitute, but the different sourcing provides less assurance on alloy spec and tolerance control than the Japan-made Yamaha part.
Recmar PAT40-04000021 NUT (PAT40-04000021) Aftermarket product	$9.26~~$10.29~~ Cross Ship Leaves in 3-5 days Please update to verify the current stock status. Product availability has not been checked in more than 7 days.	Unknown	We are working hard to determine a rating based on all available information, including product and manufacturing specifications.
We are working hard to determine a rating based on all available information, including product and manufacturing specifications.

Product Description

Yamaha factory part. Search for more factory parts & parts diagrams.

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28 Product Reviews

The best. 9 days from ordering to delivery in Tauranga NZ. Will be ordering more. 👍

Chris Wiren — Apr 6, 2026

Great price and great service

John E Fay III — Oct 9, 2025

Okay

Daniel W Maloney — Oct 8, 2024

I received prompt answers to my questions. Ordering process is quick and easy. Thank you for all your help

STEVEN SULLIVAN — Aug 21, 2024

Parts Fitment

Please verify fitment before ordering.

Brand	Product Line	Model
Evinrude	Outboard	9.8
Yamaha Motors	International	EHP
Yamaha Motors	International	ERQ
Yamaha Motors	International	25
Yamaha Motors	International	30
Yamaha Motors	International	40
Yamaha Motors	International	45
Yamaha Motors	International	48
Yamaha Motors	International	50
Yamaha Motors	International	55
Yamaha Motors	International	60
Yamaha Motors	International	70
Yamaha Motors	International	75
Yamaha Motors	International	80
Yamaha Motors	International	85
Yamaha Motors	International	90
Yamaha Motors	International	100
Yamaha Motors	Outboard	25
Yamaha Motors	Outboard	30
Yamaha Motors	Outboard	40
Yamaha Motors	Outboard	48
Yamaha Motors	Outboard	50
Yamaha Motors	Outboard	55
Yamaha Motors	Outboard	60
Yamaha Motors	Outboard	70
Yamaha Motors	Outboard	75
Yamaha Motors	Outboard	80
Yamaha Motors	Outboard	85
Yamaha Motors	Outboard	90
Yamaha Motors	Outboard	100

Supersession Chain

Name	SKU	Superseding SKU
Castle NutViewing this product	90171-16011-00	Current

Aftermarket Interchange

Name	SKU	Price	Brand
SLOTTED NUT	T40-04000021	$9.90	Parsun
Prop Nut (21231)	21231	$13.79	GLM Marine
NUT (PAT40-04000021)	PAT40-04000021	$9.26	Recmar
NUT (REC90171-16011)	REC90171-16011	$7.77	Recmar