OMC 320569 Castle Nut Nos

( Manufacturer Part Number: 320569 )

Review OMC Castle Nut Nos

The OMC 320569 Castle Nuts are an essential component for securing propellers to the shaft on outboard motor assemblies. These nuts are specifically designed to provide a robust and reliable connection between the propeller and motor, ensuring optimal performance and efficiency.

The OMC 320569 Castle Nuts are manufactured from high-strength material, ensuring they can withstand the rigors of frequent use in marine environments. Each nut features a unique hexagonal shape and a flat, washer-like top to allow for easy installation and removal. The nuts are also threaded on both sides to accommodate the use of lock washers for added security.

The surface of the OMC 320569 Castle Nuts is treated with a corrosion-resistant coating to protect against the damaging effects of saltwater, sun, and other harsh marine conditions. This coating not only helps to extend the life of the nuts but also ensures they maintain their appearance and functionality over time.

Installation of the OMC 320569 Castle Nuts is simple and straightforward. First, the propeller is aligned with the motor shaft, and the nut is threaded onto the shaft from the propeller side. A lock washer is then placed on the nut, followed by the castle nut itself. The nut is tightened using a wrench, and the process is repeated on the opposite side to ensure a secure connection.

The OMC 320569 Castle Nuts are available in various sizes to accommodate different propeller diameters and motor shaft lengths. It is crucial to select the correct size for your specific application to ensure proper fitment and functionality.

In summary, the OMC 320569 Castle Nuts are a high-quality, corrosion-resistant solution for securing propellers to outboard motor shafts. Their hexagonal shape, flat top, and threading on both sides make them easy to install and remove, while their robust construction ensures they can withstand the demands of marine use.

Pros and Cons of Buying OMC 320569 Castle Nuts

The OMC 320569 castle nut is a critical marine engineering component used to secure propeller shafts in various marine applications. Here are the pros and cons of buying this cast nut:

1. High-Quality Material: OMC cast nuts are made from premium material, ensuring durability and strength. They are typically made of bronze or brass, which can withstand the harsh marine environment.

2. Marine-Grade Coating: These cast nuts come with a marine-grade coating, such as zinc or aluminum, providing additional protection against corrosion.

3. Precise Fitment: OMC cast nuts are designed with precise specifications to ensure proper fitment with the corresponding propeller shafts and couplings.

4. Wide Application: OMC 320569 castle nuts are suitable for a wide range of marine applications, including commercial and recreational vessels.

5. Easy Installation: These cast nuts are relatively easy to install, requiring only basic tools and skills.

1. Cost: OMC cast nuts can be more expensive than other aftermarket alternatives due to their high-quality materials and precise specifications.

2. Longer Lead Time: Since OMC is a reputable marine parts manufacturer, there might be a longer lead time for ordering and receiving the cast nuts compared to other aftermarket brands.

3. Limited Availability: In some remote locations, finding an OMC dealer or supplier might be challenging, making it difficult to obtain these cast nuts when needed.

The OMC 320569 castle nut offers several advantages, including high-quality materials, precise fitment, and marine-grade coatings. However, its relatively higher cost and limited availability may deter some buyers. Ultimately, the decision to buy OMC cast nuts depends on the specific requirements of the marine application, the budget, and the availability of alternative options.

If budget is not a concern and the marine application demands the highest level of performance and durability, then OMC 320569 castle nuts are an excellent choice. For those looking for more affordable alternatives, it's recommended to explore other reputable aftermarket brands while ensuring they meet the required specifications.

part # 320569 prices

• $8.99-$15.95

specifications scowware:

• for makes: Omc
• manufacturer part number: 320569

shipping scowware:

• cost: $0.00
• transit: 4-9 Days
• carrier: USPS, UPS
• class: Standard, Expedited, One-day
• type: Calculated
• service: USPS Ground Advantage, USPS Priority Mail Flat Rate Envelope, UPS Next Day Air, UPS 2nd Day Air

payments scowware:

• credit card: Discover
• other
• wallet: Apple-pay

general scowware:

• Parts Accessories > Boat Parts > Deck Cabin Hardware
• condition: New other see details

returns scowware:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

offer scowware:

• started: March 21, 2026
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• sold: 0
• best offers: True

seller scowware:

• rating: 99.9%
• # reviews: 130719

Omc 320569 Is Similar To:

• Omc 398862 5032-398862-1 Knob And Screw Assembly Nos (31.2% similar) $7.88–$14.02. (January 6th, 2026)
• Omc 384306 90-2077 Thrust Washer Repair Kit Nos (44.4% similar) $6.00–$12.59. (January 7th, 2026)
• Omc 321318 Hood Latch Handle Nos (52.6% similar) $19.99–$23.98. (January 7th, 2026)
• Omc 103960 Washer Nos (60.9% similar) $8.58–$10.74. (January 7th, 2026)
• Omc 308293 Latch Handle Nos (61.5% similar) $8.95–$12.99. (January 7th, 2026)
• Omc 328169 Hex Nut Nos (76.6% similar) $7.99–$75.00. (January 7th, 2026)
• Omc 305585 11 Inch Bolt Nos (53.8% similar) $5.99–$12.99. (January 10th, 2026)
• Omc 313339 Nut Nos (65.1% similar) $8.99–$14.98. (January 11th, 2026)
• Omc 325792 Allen Screw Nos (62.7% similar) $11.46–$19.99. (January 12th, 2026)
• Omc 908373 New Screw Nos (44.9% similar) $10.12–$14.53. (January 12th, 2026)
• Omc 325525 Lock Spring Retainer Nos (46.7% similar) $6.99–$20.00. (January 15th, 2026)