Best Yamaha Castle Nuts

Looking for the best Yamaha castle nuts? We’ve curated a list of 10 top options to help you find the perfect fit for your ATV or outboard engine.

Yamaha castle nuts are essential parts for your ATV or outboard engine. They keep everything secure and running smoothly. Finding the right fit can make all the difference.

We’ve handpicked the best options to save you time and hassle. Whether you’re upgrading or replacing, these nuts are reliable and built to last. Let’s dive in and find the perfect match for your Yamaha.

List of Top 10 Yamaha Castle Nuts

Title	Best For	Price
WANTONE RACING 2Pcs Front Rear Axle Castle Nuts M16*1.5 Replacement for Yamaha ATV 90171-16002 Bear Tracker 250, Big Bear 400, Wolverine 350 450 Kodiak YFM450 Grizzly, Raptor 700R YFZ450	This set is perfect for Yamaha ATV owners who want a quick, solid fix for worn axle nuts. It’s great for riders who need strong, reliable, and easy-fit parts that match OEM specs.	View on Amazon (paid link)
SouthMarine 90171-18M04 Propeller Nut Castle for Yamaha 115HP 130HP 150HP 175HP 200HP 225HP 250HP Outboard Engine	This propeller nut castle is perfect for boat owners with Yamaha, Suzuki, Sierra, GLM, or Mallory outboard engines. It’s a must-have for keeping your boat running smoothly.	View on Amazon (paid link)
XYUJIE 2Pcs Front Rear Axle Castle Nuts M16*1.5 Replacement for Yamaha ATV 90171-16002 Bear Tracker 250, Big Bear 400, Wolverine 350 450 Kodiak YFM450 Grizzly, Raptor 700R YFZ450	This XYUJIE 2Pcs Front Rear Axle Castle Nuts set is perfect for Yamaha ATV owners who need a reliable replacement for their worn-out axle nuts. It’s ideal for models like Bear Tracker 250, Big Bear 400, and Raptor 700R, ensuring a perfect fit and top performance.	View on Amazon (paid link)
SouthMarine Marine Parts 90171-16011 Nut, Propeller Castle for Yamaha 40HP 50HP 55HP 60HP 70HP 90HP Outboard Engine	This nut is perfect for boat owners with a Yamaha outboard engine. It fits 40HP to 90HP models, keeping your propeller secure.	View on Amazon (paid link)
Prop Nut Castle Nut 90171-10M01-00 Fits Yamaha Outboard 8 9.9 15 20 HP x2 PCS	This Prop Nut Castle Nut is perfect for boat owners and marine mechanics who need a reliable replacement for their Yamaha outboard motors. It’s easy to install and fits perfectly, making it ideal for routine maintenance or emergency repairs.	View on Amazon (paid link)
WANTONE RACING 2Pcs Rear Axle Castle Nuts M14*1.5 Replacement for Yamaha ATV 90171-14037 Banshee 350 Blaster 200 Warrior 350 Raptor 350 660 YFZ450 Breeze Moto-4 Grizzly 125	This is perfect for Yamaha ATV riders who want a strong, easy-fit rear axle nut set that keeps their ride safe and smooth. It’s great for anyone who needs a quick, reliable replacement that matches OEM performance.	View on Amazon (paid link)
90171-16011 Copper Castle Nut for Yamaha 40HP 50HP 55HP 60HP 70HP 90HP Outboard	This Copper Castle Nut is perfect for boat owners who need a reliable replacement for their Yamaha outboard motor. It’s easy to install and built to last, making it ideal for anyone looking to fix or upgrade their engine quickly and confidently.	View on Amazon (paid link)
Caltric Rear Wheel Castle Nut with Pin Compatible with Yamaha Raptor 350 YFM350R 2007 2008 2009 2010	This Caltric Rear Wheel Castle Nut with Pin is perfect for Yamaha Raptor 350 YFM350R owners from 2007 to 2010. It’s also great for other Yamaha models like Big Bear 250 and Grizzly 125.	View on Amazon (paid link)
Quantity 2 Rear Axle Hub Castle Crown Nut 16mm x 1.50 Compatible with 2006-up Raptor 700R YFM700R	This product is perfect for ATV owners who need reliable replacement parts. It’s ideal for 2006-up Raptor 700R YFM700R models.	View on Amazon (paid link)
Caltric Front Axle Nut Compatible with Yamaha Timberwolf 250 YFB250UJ 1997 \| SEROW 225 1997 Qty 2 New	This Caltric Front Axle Nut is perfect for Yamaha Timberwolf 250 and Serow 225 owners who need a reliable replacement part. It’s easy to install and fits perfectly, saving you time and hassle.	View on Amazon (paid link)

Detailed Reviews

These top Yamaha castle nuts are picked with care to give you clear, trusted guidance. Each one is reviewed for fit, strength, and value so you know what truly works. This simple guide builds confidence and sparks interest to explore the best options for your ride.

1. WANTONE RACING 2Pcs Front Rear Axle Castle Nuts M16*1.5 Replacement for Yamaha ATV 90171-16002 Bear Tracker 250, Big Bear 400, Wolverine 350 450 Kodiak YFM450 Grizzly, Raptor 700R YFZ450

WANTONE RACING 2Pcs Front Rear Axle Castle Nuts M16*1.5 Replacement for Yamaha ATV 90171-16002 Bear Tracker 250, Big Bear 400, Wolverine 350 450 Kodiak YFM450 Grizzly, Raptor 700R YFZ450

Upgrade your Yamaha ATV with the WANTONE RACING Axle Castle Nuts. Each 2-piece set includes axle nuts and pins, designed for a perfect fit. It’s a reliable replacement for your vehicle’s needs.

Fits multiple Yamaha models, from Bear Tracker to Raptor. Meets or exceeds OEM specs, ensuring top performance. Comes with a 1-year warranty for peace of mind.

Pros	Cons
Perfect fit for Yamaha ATVs, ensuring smooth rides. Durable and meets OEM standards for top performance. Easy installation with included pins for quick replacement. 1-year warranty guarantees reliable, long-lasting use.	Not for all Yamaha models, check compatibility before buying. Aftermarket product, may not match OEM quality. Limited warranty, only covers 1 year of use.

Perfect For:

This set is perfect for Yamaha ATV owners who want a quick, solid fix for worn axle nuts. It’s great for riders who need strong, reliable, and easy-fit parts that match OEM specs.

Ready to Purchase?

View Price on Amazon (paid link)

2. SouthMarine 90171-18M04 Propeller Nut Castle for Yamaha 115HP 130HP 150HP 175HP 200HP 225HP 250HP Outboard Engine

The SouthMarine 90171-18M04 Propeller Nut Castle is a must-have for your outboard engine. It fits Yamaha, Suzuki, Sierra, GLM, and Mallory models.

This part works with Yamaha 115HP to 250HP engines. It also fits Suzuki, Sierra, GLM, and Mallory models.

The propeller nut castle is easy to install. It ensures a secure fit for your propeller. Keep your engine running smoothly with this reliable part.

Pros	Cons
Strong fit for many Yamaha motors Works with top Suzuki and Sierra parts Built for steady hold and long use Easy, quick swap for old nuts Gives your prop a firm lock	May not fit all engine models Needs care to avoid quick wear Metal finish can show marks fast

Perfect For:

This propeller nut castle is perfect for boat owners with Yamaha, Suzuki, Sierra, GLM, or Mallory outboard engines. It’s a must-have for keeping your boat running smoothly.

Ready to Purchase?

View Price on Amazon (paid link)

3. XYUJIE 2Pcs Front Rear Axle Castle Nuts M16*1.5 Replacement for Yamaha ATV 90171-16002 Bear Tracker 250, Big Bear 400, Wolverine 350 450 Kodiak YFM450 Grizzly, Raptor 700R YFZ450

XYUJIE 2Pcs Front Rear Axle Castle Nuts M16*1.5 Replacement for Yamaha ATV 90171-16002 Bear Tracker 250, Big Bear 400, Wolverine 350 450 Kodiak YFM450 Grizzly, Raptor 700R YFZ450

Upgrade your Yamaha ATV with the XYUJIE 2Pcs Front Rear Axle Castle Nuts. This M16*1.5 replacement fits many Yamaha models. Each set includes 2 axle nuts and 2 pins.

These nuts meet or exceed OEM specs. They ensure a perfect fit and performance. Trust them for your ATV’s front or rear axle needs.

Enjoy a 1-year warranty with this product. It’s a reliable aftermarket choice for your Yamaha ATV. Keep your ride safe and smooth.

Pros	Cons
Easy set with nuts and pins Strong fit for many Yamaha ATVs Smooth M161.5 thread install Reliable* OEM‑level performance Secure hold for front or rear axles	Limited to specific Yamaha models, not universal fit. No installation tools included, requires extra purchase. Aftermarket product, may not match OEM quality exactly.

Perfect For:

This XYUJIE 2Pcs Front Rear Axle Castle Nuts set is perfect for Yamaha ATV owners who need a reliable replacement for their worn-out axle nuts. It’s ideal for models like Bear Tracker 250, Big Bear 400, and Raptor 700R, ensuring a perfect fit and top performance.

Ready to Purchase?

View Price on Amazon (paid link)

4. SouthMarine Marine Parts 90171-16011 Nut, Propeller Castle for Yamaha 40HP 50HP 55HP 60HP 70HP 90HP Outboard Engine

The SouthMarine Marine Parts 90171-16011 Nut is a propeller castle nut designed for Yamaha outboard engines. It fits 40HP to 90HP models, ensuring a secure and reliable connection.

This nut is easy to install and built to last. It works with Yamaha part numbers 90171-16011-00 and 90171-16011. Keep your outboard engine running smoothly with this quality replacement part.

With its durable construction, this nut is a great choice for marine enthusiasts. It’s affordable and reliable, making it a smart investment for your Yamaha outboard engine.

Pros	Cons
Perfect fit for Yamaha outboard engines, ensuring smooth performance. Durable nut designed for long-lasting reliability in marine use. Easy installation saves time and effort on repairs. Compatible with multiple HP models, versatile and practical.	Limited compatibility with non-Yamaha outboard engines. No included tools or installation guide. Single-use part, not reusable after removal.

Perfect For:

This nut is perfect for boat owners with a Yamaha outboard engine. It fits 40HP to 90HP models, keeping your propeller secure.

Ready to Purchase?

View Price on Amazon (paid link)

5. Prop Nut Castle Nut 90171-10M01-00 Fits Yamaha Outboard 8 9.9 15 20 HP x2 PCS

The Prop Nut Castle Nut 90171-10M01-00 is a perfect fit for Yamaha outboard motors. It works with 8HP, 9.9HP, 15HP, and 20HP models.

This 2-piece set is brand new and reliable. It’s great for spares or repairs on boats and engines.

Easy to install with standard tools. Check compatibility before buying. Buyer pays any import fees.

Pros	Cons
Perfect fit for Yamaha 8HP to 20HP outboard motors. Value 2-piece set for spares or repairs. Easy installation with standard tools, no hassle. Brand new aftermarket parts, reliable and ready.	Not OEM – Aftermarket parts, not original Yamaha. Buyer Pays Taxes – Import fees are your responsibility. Check Compatibility – Must verify fit before buying.

Perfect For:

This Prop Nut Castle Nut is perfect for boat owners and marine mechanics who need a reliable replacement for their Yamaha outboard motors. It’s easy to install and fits perfectly, making it ideal for routine maintenance or emergency repairs.

Ready to Purchase?

View Price on Amazon (paid link)

6. WANTONE RACING 2Pcs Rear Axle Castle Nuts M14*1.5 Replacement for Yamaha ATV 90171-14037 Banshee 350 Blaster 200 Warrior 350 Raptor 350 660 YFZ450 Breeze Moto-4 Grizzly 125

WANTONE RACING 2Pcs Rear Axle Castle Nuts M14*1.5 Replacement for Yamaha ATV 90171-14037 Banshee 350 Blaster 200 Warrior 350 Raptor 350 660 YFZ450 Breeze Moto-4 Grizzly 125

Upgrade your Yamaha ATV with the WANTONE RACING Rear Axle Castle Nuts. This 2-piece set includes nuts and pins, designed for a perfect fit. They meet or exceed OEM standards, ensuring top performance.

These M14*1.5 threaded nuts fit multiple Yamaha models, from Banshee 350 to Grizzly 125. They come with a 1-year warranty, giving you peace of mind.

Pros	Cons
Perfect fit for Yamaha ATV models, ensuring smooth performance. Durable and meets OEM standards for long-lasting use. Complete set with nuts and pins for easy installation. 1-year warranty for peace of mind and reliability.	May not fit all Yamaha models Basic look, not stylish Pins can be easy to misplace

Perfect For:

This is perfect for Yamaha ATV riders who want a strong, easy-fit rear axle nut set that keeps their ride safe and smooth. It’s great for anyone who needs a quick, reliable replacement that matches OEM performance.

Ready to Purchase?

View Price on Amazon (paid link)

7. 90171-16011 Copper Castle Nut for Yamaha 40HP 50HP 55HP 60HP 70HP 90HP Outboard

The 90171-16011 Copper Castle Nut is a reliable replacement for your Yamaha outboard motor. It fits 40HP to 90HP models, ensuring a perfect match.

This nut is built to last with good texture and durable materials. It’s easy to install, saving you time and effort.

Direct replacement, great performance, long service life.

Pros	Cons
Durable and practical for long-lasting use. Easy installation with great workmanship. Direct replacement for old or damaged parts. Smooth performance and simple to use.	May not fit all older models Needs care to avoid wear Not ideal for heavy strain

Perfect For:

This Copper Castle Nut is perfect for boat owners who need a reliable replacement for their Yamaha outboard motor. It’s easy to install and built to last, making it ideal for anyone looking to fix or upgrade their engine quickly and confidently.

Ready to Purchase?

View Price on Amazon (paid link)

8. Caltric Rear Wheel Castle Nut with Pin Compatible with Yamaha Raptor 350 YFM350R 2007 2008 2009 2010

The Caltric Rear Wheel Castle Nut with Pin is compatible with Yamaha Raptor 350 YFM350R models from 2007 to 2010. It also fits other Yamaha models like the Big Bear 250 and Grizzly 125. This OEM-quality part ensures a perfect fit for your ATV.

Each order includes 1 castle nut and 1 cotter pin, with exact dimensions for easy installation. Verify fitment using the description and images to ensure it’s right for your vehicle.

Pros	Cons
Fits key Yamaha ATV models with ease Matches OEM specs for smooth, safe use Includes both nut and pin for quick install Strong build for long ride life Simple size check for perfect fit	Limited compatibility with other ATV models. No installation tools or instructions included. Small parts may be easily lost during assembly.

Perfect For:

This Caltric Rear Wheel Castle Nut with Pin is perfect for Yamaha Raptor 350 YFM350R owners from 2007 to 2010. It’s also great for other Yamaha models like Big Bear 250 and Grizzly 125.

Ready to Purchase?

View Price on Amazon (paid link)

9. Quantity 2 Rear Axle Hub Castle Crown Nut 16mm x 1.50 Compatible with 2006-up Raptor 700R YFM700R

This pair of rear axle nuts gives your Raptor 700R strong, steady hold. Each nut fits 16mm x 1.50 threads for a clean, secure fit.

They install fast. They lock tight. They keep your axle steady.

Pros	Cons
Perfect fit for 2006-up Raptor 700R YFM700R models. Durable 16mm x 1.50 rear axle nuts for long-lasting use. Easy installation with CRU Products quality assurance. Quantity 2 ensures you have a spare or replacement ready.	Limited compatibility with other models, not a universal fit. No tools included, requires separate purchase for installation. Only two nuts, may need more for complete replacement.

Perfect For:

This product is perfect for ATV owners who need reliable replacement parts. It’s ideal for 2006-up Raptor 700R YFM700R models.

Ready to Purchase?

View Price on Amazon (paid link)

10. Caltric Front Axle Nut Compatible with Yamaha Timberwolf 250 YFB250UJ 1997 | SEROW 225 1997 Qty 2 New

Caltric Front Axle Nut is a compatible replacement for Yamaha Timberwolf 250 and Serow 225 models from 1997. This 2-piece set includes castle nuts and cotter pins, ensuring a secure fit for your vehicle’s front axle.

Easy to install, durable, and affordable. Check the dimensions and pictures to confirm compatibility before ordering.

Pros	Cons
Perfect fit for Yamaha Timberwolf 250 and Serow 225 models. Includes 2 nuts and 2 pins for complete axle replacement. Exact dimensions match OEM specs for easy installation. Durable parts ensure long-lasting performance and reliability.	No installation tools or instructions included. Limited compatibility with other Yamaha models. Small parts may be easily lost during assembly.

Perfect For:

This Caltric Front Axle Nut is perfect for Yamaha Timberwolf 250 and Serow 225 owners who need a reliable replacement part. It’s easy to install and fits perfectly, saving you time and hassle.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Finding the right Yamaha castle nut feels great. Your ride stays tight, safe, and smooth.

You get a simple, clear guide here. Every step helps you pick the best match with zero stress.

Factors to Consider When Buying Yamaha Castle Nuts

Fitment:
Make sure the nut matches your exact Yamaha model. A correct fit keeps your axle or prop tight. Wrong size means loose parts and real trouble.
Thread Size:
Check the thread size like M16×1.5 or M14×1.5. Small changes matter a lot. The right thread locks in clean and safe.
Material Quality:
Strong steel or copper lasts longer. Good material stops rust and wear. It keeps your ride smooth for a long time.
OEM Match:
Look for nuts that meet or exceed OEM specs. This gives you a safe, solid fit. Your machine runs better with proper parts.
Included Pins:
Many castle nuts come with cotter pins. Pins keep the nut from moving. It’s a simple part that adds big safety.
Engine or Axle Type:
Outboard engines need prop nuts. ATVs need axle nuts. Pick the type made for your machine.
Ease of Install:
Choose nuts that install with basic tools. Quick install saves time. You get back to riding fast.
Durability:
Look for long service life. Strong nuts stay tight under pressure. They handle rough rides and heavy use.
Warranty:
A 1‑year warranty adds peace of mind. It shows the maker trusts their product. You get extra safety.
Price Value:
Good nuts don’t need to cost much. Pick parts that give strong value. Safe and steady performance matters most.

Your Buying Experience

You should feel sure and relaxed when picking your castle nut. Clear choices make your ride safer and smoother. Each factor helps you choose the right part with confidence.