Best Flange Nuts of 2026

Brian Howie Avatar
Brian Howie
Last Updated: Jan 8, 2026

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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

Hard-to-Find Fastener Coarse Hex Flange Nuts Cover #TOP 1
Hard-to-Find Fastener Coarse Hex Flange Nuts
ftb score rating icon 9.9
SG TZH 3/8-16 Serrated Flange Nuts Cover #TOP 2
SG TZH 3/8-16 Serrated Flange Nuts
ftb score rating icon 9.8
Hard-to-Find Fastener Flange Nuts 16mm Cover #TOP 3
Hard-to-Find Fastener Flange Nuts 16mm
ftb score rating icon 9.6

Top 10 Flange Nuts

#TOP 1

Hard-to-Find Fastener Coarse Hex Flange Nuts

014973242541
Silver
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 2

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 3

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 4

Aienxn 136PCS Carbon Steel Hex Flange Nuts Kit

Q-099
Black
M3-M10 (136PCS)
Aienxn 136PCS Carbon Steel Hex Flange Nuts Kit Cover
Aienxn 136PCS 6 Metric Sizes Black Carbon Steel Hex Flange Nuts Assortment Kit -M3, M4, M5, M6, M8, M10

The Aienxn Hex Flange Nuts kit offers 136 pieces in six metric sizes, perfect for various projects. Made from durable carbon steel with a zinc coating, these nuts resist rust and wear, ensuring long-lasting use. Their design prevents slipping, which means you can install or remove them easily without frustration. Plus, they are reusable, saving you money and effort over time. This kit is versatile, suitable for home repairs, automotive work, or shop projects, making it a handy addition to your toolbox for everyday tasks.

What We Like
Durable carbon steel construction
Slip-resistant design
Reusable nuts
Wide size variety
Versatile applications
#TOP 5

BCP Fasteners 3/8-16 Zinc Plated Flange Lock Nuts 40 Pack

BCP271
Silver/Gray
3/8-16 (40 ct)
BCP Fasteners 3/8-16 Zinc Plated Flange Lock Nuts 40 Pack Cover
BCP Fasteners 40 Pack 3/8-16 Zinc Plated Serrated Flange Hex Lock Nuts (BCP271)

The BCP Fasteners Flange Lock Nuts come in a convenient pack of 40, giving you plenty of nuts for your projects. These nuts are coated with zinc, which helps protect them from rust and corrosion, making them last longer even in harsh environments. The hex socket drive is sized at 9/16", making it easy for you to tighten or loosen the nuts with standard tools. Each nut has an overall height of 0.324 inches, providing a sturdy and reliable fit for your fastening needs. These features combine to offer durability and ease of use for both DIY enthusiasts and professionals.

What We Like
Corrosion resistance
Pack of 40 nuts
9/16" hex socket drive
Compact height design
#TOP 6

Aienxn 85PCS Stainless Steel Hex Flange Nuts Kit

Q-057-kit
Silver
M3-M10 (85PCS)
Aienxn 85PCS Stainless Steel Hex Flange Nuts Kit Cover
Aienxn 85PCS 6 Metric Sizes 304 Stainless Steel Hex Flange Nuts Assortment Kit-M3 M4 M5 M6 M8 M10

The Aienxn Hex Flange Nuts kit offers you a reliable set of 85 stainless steel nuts in six popular metric sizes, perfect for various projects. Made from durable 304 stainless steel, these nuts resist corrosion, ensuring they last even in tough conditions. Their design helps prevent slipping, so you can install and remove them with ease, saving you time and effort. The assortment covers common sizes from M3 to M10, making it convenient for home repairs, automotive tasks, or workshop needs. With this kit, you get a versatile and reusable solution that fits many fastening jobs.

What We Like
Corrosion resistance
Anti-slip design
Reusable and easy installation
Multiple common sizes
Durable stainless steel
#TOP 7

Hard-to-Find Fastener 014973387167 Grade 8 3/8-16 Flange Nuts

014973387167
Yellow
3/8"
Hard-to-Find Fastener 014973387167 Grade 8 3/8-16 Flange Nuts Cover
Hard-to-Find Fastener 014973387167 Flange Nuts - Grade 8, 3/8-16, Piece-15

The Hard-to-Find Fastener Flange Nuts offer a reliable 3/8-inch diameter, making them suitable for a variety of fastening needs where size consistency matters. Made from durable steel, these nuts provide strength and long-lasting performance, ensuring your projects stay secure. The yellow zinc finish adds a layer of corrosion resistance, helping protect the nuts from rust and wear over time. Featuring a hex washer head style, these nuts are easy to grip and tighten with common tools, giving you convenience and efficiency during installation. This combination of features makes these flange nuts a practical choice for your fastening tasks.

What We Like
Durable steel construction
Corrosion-resistant yellow zinc finish
Standard 3/8-inch diameter
Easy-to-use hex washer head
#TOP 8

Hard-to-Find Fastener 014973124847 10mm Flange Nuts

014973124847
Black
10mm
Hard-to-Find Fastener 014973124847 10mm Flange Nuts Cover
Hard-to-Find Fastener 014973124847 Flange Nuts, 10mm-1.50, Piece-15, Black

The Hard-to-Find 10mm Flange Nuts are made of durable steel, giving you strong and reliable fasteners for your projects. Their 10mm diameter ensures they fit standard applications, making them versatile for various uses. The black phosphate finish not only looks sleek but also helps protect the nuts from rust and corrosion, so you can count on them lasting longer. Plus, these nuts are designed to be tightened with a #16 wrench, providing you with a convenient and secure grip during installation. Overall, these flange nuts offer strength, durability, and ease of use for your fastening needs.

What We Like
Durable steel material
Standard 10mm diameter
Rust-resistant black phosphate finish
#16 wrench compatibility
#TOP 9

QXSKSLH M8 304 Stainless Steel Flange Nuts, 25-Pack

Silver Tone
QXSKSLH M8 304 Stainless Steel Flange Nuts, 25-Pack Cover
QXSKSLH 25 Pieces M8 Flange Nuts, M8-1.25mm Serrated Hex Flange Lock Nuts, 304 Stainless Steel,Plain Finish

The QXSKSLH M8 Flange Nuts come in a convenient pack of 25, making it easy for you to have enough fasteners on hand for multiple projects. Made from durable stainless steel, these nuts resist rust and corrosion, so they last longer in various environments. The M8 size is a common thread dimension that fits many bolts, providing versatility for your hardware needs. Plus, the silver tone finish offers a clean, professional look. These nuts also feature a serrated flange, which helps keep them secure and prevents loosening during use, giving you reliable performance every time.

What We Like
Stainless steel material
Pack of 25 nuts
M8 thread size
Serrated flange design
Silver tone finish
#TOP 10

Hard-to-Find Fastener 014973242497 Zinc Coarse Hex Serrated Flange Nuts 1/4-20, 100 Piece

014973242497
silver/gray
1/4"-20
Hard-to-Find Fastener 014973242497 Zinc Coarse Hex Serrated Flange Nuts 1/4-20, 100 Piece Cover
Hard-to-Find Fastener 014973242497 Coarse Hex Serrated Flange Nuts, 1/4-20, Piece-100

The Hard-to-Find Fastener Zinc Nuts are made with a 1/4-inch diameter, perfect for projects requiring medium-sized fasteners. Crafted from durable steel, these nuts provide strength and reliability for your fastening needs. The zinc finish helps protect against rust and corrosion, ensuring a longer lifespan even in tough environments. Designed to be tightened with a 7/16-inch wrench, these nuts are easy to install and remove, giving you convenience during assembly or repairs. The coarse thread design allows for quicker fastening, which is helpful when you need to work efficiently. Overall, these nuts offer practical benefits for various fastening tasks.

What We Like
Durable steel material
Rust-resistant zinc finish
Easy 7/16-inch wrench use
Efficient coarse thread design
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 6,992 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 $10.76.

The flange nuts are available for purchase. We have researched hundreds of brands and picked the top brands of flange nuts, including Hard-to-Find Fastener, SG TZH, Aienxn, BCP Fasteners, QXSKSLH. The seller of top 1 product has received honest feedback from 384 consumers with an average rating of 4.7.

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.