Best Flange Nuts of 2025

Brian Howie Avatar
Brian Howie
Last Updated: Jan 2, 2025

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Flange nuts are essential fasteners that have a built-in washer-like flange at one end. This unique design allows for a more secure and tight connection when used in conjunction with bolts or screws. The flange acts as a locking mechanism, preventing the nut from loosening due to vibrations or other external factors. These nuts are commonly used in automotive, construction, and industrial applications where strong and reliable fastening is crucial. With their excellent resistance to corrosion and high strength properties, flange nuts are a trusted choice for professionals and DIY enthusiasts alike.

At a Glance: Our Top Picks

Hilitchi 140-Pcs Flange Nuts Assortment Kit Cover #TOP 1
Hilitchi 140-Pcs Flange Nuts Assortment Kit
ftb score rating icon 9.9
BCP Fasteners Zinc Flange Lock Nuts Cover #TOP 2
BCP Fasteners Zinc Flange Lock Nuts
ftb score rating icon 9.8
Hard-to-Find Fastener Coarse Hex Flange Nuts Cover #TOP 3
Hard-to-Find Fastener Coarse Hex Flange Nuts
ftb score rating icon 9.6

Top 10 Flange Nuts

#TOP 1

Hilitchi 140-Pcs Flange Nuts Assortment Kit

HFN140
Silver
Hilitchi 140-Pcs Flange Nuts Assortment Kit Cover
Hilitchi 140-Pcs M3 M4 M5 M6 M8 M10 M12 Hex Flange Nuts Assortment Kit - 304 Stainless Steel

The Hilitchi Flange Nuts Kit is a high-quality assortment of flange nuts made from 304 stainless steel. With 140 pieces packed in a rugged and convenient re-sealable plastic storage case, this kit offers great value for money. The nuts are of the hex serrated flange type, ensuring a secure grip and preventing loosening under vibration. Made from 304 stainless steel, these nuts are resistant to corrosion, making them durable and long-lasting. The kit includes 7 different sizes, ranging from M3 to M12, providing versatility for various applications. Whether you're a professional or a DIY enthusiast, the Hilitchi Flange Nuts Kit is a must-have for all your fastening needs.

What We Like
High-quality assortment
Secure grip with hex serrated flange nuts
Durable and long-lasting 304 stainless steel
#TOP 2

BCP Fasteners Zinc Flange Lock Nuts

BCP270
Silver
5/16-18 (50 ct)
BCP Fasteners Zinc Flange Lock Nuts Cover
Fifty (50) 5/16-18 Zinc Plated Serrated Flange Hex Lock Nuts (BCP270)

The BCP Flange Lock Nuts are designed with a zinc plating that protects against corrosion, ensuring durability and a long lifespan for your projects. Each nut features a hex socket drive measuring 1/2 inch, making it easy for you to install and remove them with standard tools. With an overall height of .271 inches and a flange diameter of .6765 inches, these nuts provide a secure grip and stability. Ideal for various applications, these nuts can help you achieve reliable fastening in construction or repair tasks.

What We Like
Corrosion-resistant zinc plating
Convenient hex socket drive
Secure grip and stability
Durable for various applications
#TOP 3

Hard-to-Find Fastener Coarse Hex Flange Nuts

014973242541
3/8"16
Hard-to-Find Fastener Coarse Hex Flange Nuts Cover
Hard-to-Find Fastener 014973242541 Coarse Hex Serrated Flange Nuts, 3/8-16, Piece-100

The Hard-to-Find Flange Nuts are designed with a 3/8-inch diameter, making them a reliable choice for various fastening needs. Crafted from durable steel, these nuts offer strength and longevity, ensuring your projects stay secure over time. The zinc finish provides added protection against corrosion, enhancing their durability even in challenging environments. With a driver type compatible with a 9/16-inch wrench, you will find it easy to tighten or loosen these nuts quickly. These features combined make the Hard-to-Find Flange Nuts a practical solution for anyone looking to maintain or build sturdy structures.

What We Like
Durable steel construction
Corrosion-resistant zinc finish
Easy to use with 9/16" wrench
Reliable fastening solution
#TOP 4

Hard-to-Find Fastener 3/8" Hex Flange Lock Nuts

014973271817
Yellow
3/8-16"
Hard-to-Find Fastener 3/8" Hex Flange Lock Nuts Cover
Hard-to-Find Fastener 014973271817 Grade 8 Hex Flange Lock Nuts, 3/8-16, Piece-100

The Hard-to-Find Fastener Lock Nuts are designed with a 3/8" diameter, making them perfect for various applications where a secure fit is essential. Made from durable steel and finished with yellow zinc, these nuts resist corrosion and extend their lifespan. The hex washer head style allows for easy installation using a standard 9/16" wrench, giving you convenience when tightening or loosening. With a coarse thread type, these lock nuts provide a reliable grip, ensuring that your assemblies stay intact during use. You'll appreciate the combination of strength and ease these nuts offer in your projects.

What We Like
Durable steel construction
Corrosion-resistant finish
Easy installation with standard wrench
Reliable grip for secure fit
#TOP 5

GPJYYDS 1/4-20 Serrated Flange Nuts

GPJYYDS
YYDS-240327N-0001
1/4"-20
GPJYYDS 1/4-20 Serrated Flange Nuts Cover
1/4-20 Serrated Flange Hex Nuts, 1/4" Hexagon Flange Nuts, 304 Stainless Steel, UNC Nuts Fasteners, Replacement Nut for DIY Home Mechanism, 50 Pack

The GPJYYDS Serrated Flange Nuts are made from durable 304 stainless steel, ensuring they can withstand outdoor conditions and provide excellent strength. With a thread size of 1/4-20, these nuts have a unique serrated flange design that distributes fastening force over a larger area. This feature helps prevent damage to surfaces and ensures a secure fit, especially on uneven surfaces. Additionally, the nuts come neatly packaged in a clear plastic box, making it easy for you to keep them organized and accessible whenever you need them for your home projects or construction tasks.

What We Like
Durable stainless steel construction
Secure connection on uneven surfaces
Convenient organized packaging
Heavy-duty performance
#TOP 6

SG TZH 3/8-16 Serrated Flange Nuts

Silver
3/8-16
SG TZH 3/8-16 Serrated Flange Nuts Cover
3/8-16 Serrated Flange Hex Lock Nuts 100Pcs 304 Stainless Steel 18-8, Full Thread, Hex Drive, Bright Finish by SG TZH

The SG TZH Flange Nuts package includes 100 durable nuts, perfect for various applications at home, work, or in the office. With a diameter of 0.637 inches and a height of 0.334 inches, these nuts are designed for easy installation and secure fastening. Their serrated design grips the material surface, minimizing the chances of loosening due to vibrations. Made from high-quality 304 stainless steel, these nuts are resistant to rust and corrosion, ensuring a longer lifespan and reliability for your projects. Enjoy the convenience of having a sturdy and dependable product at your disposal.

What We Like
Value pack of 100 nuts
High corrosion resistance
Serrations for better grip
Long-lasting durability
#TOP 7

Aienxn 140PCS Stainless Steel Hex Flange Nuts Kit

Q-057-BOX
140PCS M3-M12 Kit
M3-M12 (140PCS)
Aienxn 140PCS Stainless Steel Hex Flange Nuts Kit Cover
Aienxn 140PCS 7 Metric Sizes 304 Stainless Steel Hex Flange Nuts Assortment Kit -M3, M4, M5, M6, M8, M10, M12

The Aienxn Hex Flange Nuts offer exceptional quality with their 304 stainless steel construction, ensuring durability and resistance to corrosion. You’ll find these nuts easy to install and remove, making your projects more efficient. They are designed to prevent slipping, providing a secure fit that enhances safety during use. With a variety of seven sizes included in the kit, you can easily find the right nut for your specific needs, whether for home repairs, automotive projects, or industrial applications.

What We Like
Durable 304 stainless steel
Corrosion resistant
Easy to install and remove
Variety of sizes available
#TOP 8

Hard-to-Find Fastener Grade 8 Hex Flange Nuts

014973271848
Yellow
1/2-13"
Hard-to-Find Fastener Grade 8 Hex Flange Nuts Cover
Hard-to-Find Fastener 014973271848 Grade 8 Hex Flange Lock Nuts, 1/2-13, Piece-50

The Hard-to-Find Fastener Flange Nuts are designed with a 1/2-inch diameter, making them suitable for various applications where a secure fit is essential. Crafted from durable steel and finished with yellow zinc, these nuts offer excellent corrosion resistance, ensuring longevity in challenging environments. The hex washer head is designed for easy installation using a 3/4-inch wrench, providing convenience during assembly. With a coarse thread type, these nuts deliver a strong grip, helping you maintain stability in your projects. Overall, these features make these flange nuts a reliable choice for both DIY enthusiasts and professionals alike.

What We Like
Corrosion-resistant yellow zinc finish
Durable steel construction
Easy installation with hex washer head
Coarse thread for strong grip
#TOP 9

Hard-to-Find Fastener Flange Nuts 16mm

014973124878
Black
16mm-2.0
Hard-to-Find Fastener Flange Nuts 16mm Cover
Hard-to-Find Fastener 014973124878 Flange Nuts, 16mm-2.00, Piece-5

The Hard-to-Find Flange Nuts are designed with a 16mm diameter, making them ideal for various fastening needs. Crafted from durable steel, these nuts ensure strength and longevity in your projects. The black phosphate finish not only adds a sleek look but also provides corrosion resistance, enhancing their lifespan. With a driver type compatible with a #24 wrench, you can easily tighten or loosen these nuts, saving you time and effort during assembly or repairs. The coarse thread type of 2.0mm ensures a secure fit, giving you peace of mind that your connections will hold strong.

What We Like
Durable steel construction
Corrosion-resistant finish
Easy to use with #24 wrench
Secure coarse thread fit
#TOP 10

M8 Serrated Flange Lock Nuts by SpzcdZa

SD0318001
Silver tone
M8(25pcs)
M8 Serrated Flange Lock Nuts by SpzcdZa Cover
M8 x 1.25mm Serrated Flange Hex Lock Nuts, SpzcdZa 25pcs 304 Stainless Steel Serrated Metric Hex Flange Lock Nuts,Bright Finish

The SpzcdZa Serrated Lock Nuts are designed with an M8 thread diameter and a 1.25mm pitch, making them a reliable choice for various applications. Their 304 stainless steel construction ensures they resist corrosion and rust, perfect for use in damp environments. The wide flange increases the nut's bearing surface, preventing loosening over time. Additionally, the nuts' dimensions, including a height of 8mm, allow for easy installation in tight spaces. This combination of durability and convenience makes these nuts ideal for automotive, motorcycle, and home appliance projects.

What We Like
Corrosion and rust resistant
Wide flange for stability
Durable stainless steel material
Easy installation in tight spaces
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What is a flange nut used for?

A flange nut is used to secure parts together by distributing the pressure over a wider surface area. This helps prevent damage to the parts and reduces the chances of loosening due to uneven surfaces.

2. What is a flange nut vs normal nut?

A flange nut is different from a normal nut because it has a protruding rim or flange that provides a larger surface area for contact. This allows the flange nut to press against a larger surface area of the object it is installed on, providing better stability and resistance to loosening.

3. Are flange nuts better?

Flange nuts are designed to address some of the limitations of using washers. Traditional washers can deform under high stress, while flange nuts provide a more secure and stable connection without the need for additional washers.

4. What size are flange nuts?

Flange nuts come in various sizes, typically ranging from #6 to 5/8". Sizes smaller than 1/4" are indicated by numbers, while sizes 1/4" and larger are specified in inches.

5. Are flange nuts stronger?

Yes, flange nuts provide additional strength due to the integrated washer or flange. The flange adds to the tightening strength of the nut, making it more resistant to loosening.

6. Are flange nuts self-locking?

Yes, flange nuts have a serrated flange that digs into the material being fastened, helping to prevent loosening. This self-locking feature eliminates the need for additional locking mechanisms.

7. What is the difference between a nut and a flange nut and a washer?

A flange nut has a built-in washer (flange) that turns with the nut, providing additional protection to the mating surfaces. A washer, on the other hand, does not turn with the nut and is used to control wear. Flange nuts offer more surface protection compared to washers.

8. What is the difference between a flange nut and a hex nut?

A flange nut has a built-in washer (flange) that distributes the clamping load over a wider area, providing better stability. This makes it a better option for oversized or slotted holes compared to a regular hex nut.

Editor's Notes

During our flange nut research, we found 24 flange nut products and shortlisted 10 quality products. We collected and analyzed 8,619 customer reviews through our big data system to write the flange nuts list. We found that most customers choose flange nuts with an average price of $11.74.

The flange nuts are available for purchase. We have researched hundreds of brands and picked the top brands of flange nuts, including Hilitchi, BCP Fasteners, Hard-to-Find Fastener, GPJYYDS, SG TZH. The seller of top 1 product has received honest feedback from 525 consumers with an average rating of 4.8.

Written by
Brian Howie Avatar

Brian Howie is a content writer and senior industrial designer. After graduation from Westminster College, he has been engaged in product design and manufacturing for 18 years. Brian Howie has always found great pleasure in designing industrial products and sharing his ideas and experience online.