DORMAN 785-440D Tube Nut Fnpt Mnpt Fitting 885484893764 1/4 3/8

( Brand: Dorman ), ( Manufacturer Part Number: 785-440D ), ( UPC: 885484893764 ), ( Type: Hardware, Fasteners And Fittings )

Review DORMAN Brass Tube Nut 1/4 Inch Fnpt 3/8 Mnpt Fitting

Introducing the Dorman 785-440D Tube Nut, a versatile automotive component designed to provide a secure connection between 1/4 inch FNPT (Flanged National Pipe Thread) and 3/8 inch MNPT (Machine National Pipe Thread) fittings. This tube nut is an essential addition to your automotive toolkit, suitable for various applications in automotive, industrial, and hydraulic systems.

The Dorman 785-440D tube nut is manufactured from high-quality materials, ensuring durability and resistance to corrosion. Its robust construction is designed to withstand the rigors of high-pressure applications, making it an excellent choice for automotive enthusiasts and professional mechanics.

The 1/4 inch FNPT thread on this tube nut conforms to the National Pipe Thread standard and is designed to provide a leak-free seal with the corresponding 1/4 inch FNPT fitting. The 3/8 inch MNPT thread on the other end is equally reliable, ensuring a secure connection with the corresponding 3/8 inch MNPT fitting.

This tube nut features a unique tapered design, which allows for easy installation and removal, even in tight spaces. The tapered design also ensures that the nut is self-aligning, making it easier to achieve proper alignment between the fittings and minimizing the risk of cross-threading or damage to the threads.

The Dorman 785-440D tube nut is designed to provide a reliable and secure connection between two different thread types in a variety of applications. It is suitable for use in automotive cooling systems, hydraulic systems, industrial applications, and more. With its high-quality construction, versatility, and ease of use, this tube nut is an essential addition to any automotive toolkit or repair shop.

In summary, the Dorman 785-440D Tube Nut is a high-quality, versatile automotive component designed to provide a secure connection between 1/4 inch FNPT and 3/8 inch MNPT fittings. Its robust construction, tapered design, and ease of use make it an excellent choice for automotive enthusiasts, professional mechanics, and industrial applications.

Dorman 785-440D Tube Nut: A Detailed Analysis of Its Pros and Cons

The Dorman 785-440D tube nut is a 1/4" FNPT (Flanged National Pipe Thread) to 3/8" MNPT (Male National Pipe Thread) fitting. It is commonly used in various automotive applications for connecting hoses or tubes. In this analysis, we will discuss the key advantages and disadvantages of using this particular tube nut.

1. Versatility: The Dorman 785-440D tube nut can be used for converting different thread types, which makes it a versatile choice for various automotive applications.

2. Durability: Made from high-quality materials, this tube nut can withstand the rigors of automotive use and provides a secure connection between hoses or tubes.

3. Easy Installation: The thread conversion feature of the Dorman 785-440D tube nut makes installation easier and more convenient, as it eliminates the need for separate thread adapters.

1. Cost: Compared to simpler thread adapters, the Dorman 785-440D tube nut may be more expensive due to its thread conversion feature and additional functionality.

2. Size: This tube nut may not fit in all applications where a standard thread adapter would work, due to its larger size and the need for the flanged end.

3. Limited Use: While the Dorman 785-440D tube nut is versatile for thread conversions, it may not be suitable for all types of automotive applications, such as high-pressure fuel or cooling systems, where specialized fittings are required.

The Dorman 785-440D tube nut offers several advantages, including versatility, durability, and ease of installation. However, it also comes with some disadvantages, such as higher cost and size limitations. Ultimately, whether this tube nut is the right choice for a particular automotive application depends on the specific requirements and constraints of that application.

If you need to convert between 1/4" FNPT and 3/8" MNPT threads in an automotive application where size and cost are not major concerns, the Dorman 785-440D tube nut can be a reliable and convenient solution. However, if you require a more cost-effective option or have size limitations, you may want to consider using separate thread adapters instead.

Details:

Fast Free, Shipping: Brand Dorman, Part Number 785-440D, UPC Code 4, Condition New. The color, quantity, size, etc. This item comes with the full manufacturers warranty. May not be accurate.

The compatibility section is not always 100% accurate.

part #: 785440d prices

• $10.56-$20.03

specifications toolssupp:

• brand: Dorman
• mpn: 785-440d
• upc: 885484893764
• type: Hardware, Fasteners And Fittings

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seller toolssupp:

• rating: 99.6%
• city: Flat Rock, North Carolina
• # reviews: 14277

shipping toolssupp:

• class: Standard
• cost: $0.00
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• type: Fixed
• transit: 3-6 Days

general toolssupp:

• condition: New
• Motors > Automotive Tools Supplies > Other Auto Tools Supplies

offer toolssupp:

• quantity: 4
• sold: 0
• options: Ship-to-home
• started: December 14, 2025
• availability: In Stock

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• policy: Returns Accepted
• time: 30 Days

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