Tools & Home Improvement

The Best Flange Nuts

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Our picks are based on Amazon bestseller rankings, verified customer ratings, and product availability. We update our recommendations regularly to ensure accuracy.

Flange nuts are essential fasteners in many applications, providing a wider load-bearing surface than standard nuts. Their integrated washer design prevents the need for separate washers, simplifying assembly and reducing the risk of loosening. Selecting the correct flange nut ensures a secure and reliable connection, crucial for the integrity of any project.

No. 1
3/8-16 Serrated Flange Hex Lock Nuts, Stainless Steel 18-8 (304), Bright Finish, 10 PCS
  • Made of high quality stainless steel 18-8 which offers a high level of chemical and corrosion resistance.
  • Nut Type: Hex Serrated Flange Nut; System of Measurement: Inch.
  • Inside Diameter: 3/8 Inch; Thread Size: 16 Threads per Inch.
  • Package Included: 10 x Serrated Flange Hex Lock Nuts 3/8-16.
  • Flange Nuts are great to have around for use in wood and wet environments.
No. 2
Aienxn 136PCS 6 Metric Sizes Black Carbon Steel Hex Flange Nuts Assortment Kit -M3, M4, M5, M6, M8, M10
  • Premium Quality: Aienxn hex flange nuts are made of carbon steel and zinc plated
  • Features: Aienxn hex flange nuts is not easy to slip, easy to install and disassemble, and reusable
  • Wide Application: These hex flange nuts are suitable for home, automotive, and shop use; Hex flange nuts assortment kit is a great replacement for industrial and construction fasteners, also can be a important accessories in your daily life
  • Size: The hex flange nuts have 6 sizes of 136pcs, M3, M4, M5, M6, M8, M10, the most commonly used nuts is packed in a plastic box, and different sizes can meet your different needs
  • Timely Reply: If you have any questions, please email us and we will reply you within 24 hours
No. 3
QXSKSLH 50 Pieces 1/4-20 Flange Nuts, 1/4-20 Serrated Hex Flange Lock Nuts, 304 Stainless Steel,Plain Finish
  • Thread Pitch: 20 TPI; Material: Stainless Steel
  • Package Content: 50Pcs x Hex Flange Nut
  • Main Color: Silver Tone;
  • Hex Size: 11mm(0.43")(Width) Height: 6mm(0.24")
  • Flange Diameter: 15mm(0.59")
No. 4
BCP Fasteners 40 Pack 3/8-16 Zinc Plated Serrated Flange Hex Lock Nuts (BCP271)
  • Zinc plated for corrosion resistance
  • Package of 40 pieces
  • Hex Socket Drive 9/16"
  • Overall Height .324 Inches
  • Flange Diameter .745" Inches
No. 5
Besitu 280Pcs Metric Flange Bolt Assortment, M6x1.0, M8x1.25, M10x1.5 (12mm to 30mm) Assorted Hex Bolts and...
  • 【Metric Flange Bolt Assortment】This is nice selection of metric flange head bolts of the most common lengths along with the nuts and washers, Including M6-1.0 x 12/16/20/25/30mm, M8-1.25 x 16/20/25/30mm, M10-1.5 x30mm, 280pcs in total. The fully...
  • 【10.9 Alloy and Black Galvanized】This flange bolt kit is crafted from 10.9 grade alloy steel with a durable black galvanized finish. If you're working inside the engine, you'll need high-strength Class 10.9 bolts on hand. Class 8.8 bolts are not rated...
  • 【Time & Money Saver】Great bins for storage with a size chart on the inside and outside. Compared to the time it takes to go to a hardware store and the cost of buying individual packs, this flange bolts nuts washers kit is a time and money saver.
  • 【Wide Applications】The flange has serrations grip that increases the torque needed to loosen the bolt, which is perfect for mounting something that exposed to vibrations and harshness during action. Widely used in home improvement, automotive projects...
  • 【Reusable Container】Everything is sorted in separate compartments that are labeled, which is nice when you're looking for a specific size. You can also reuse the plastic container after you've used all the flange bolt kit. The quintessential toolbox...
No. 6
Aienxn 85PCS 6 Metric Sizes 304 Stainless Steel Hex Flange Nuts Assortment Kit-M3 M4 M5 M6 M8 M10
  • Premium Quality: Aienxn hex flange nuts are made of 304 Stainless Steel
  • Features: Aienxn hex flange nuts is not easy to slip, corrosion resistant, easy to install and disassemble, and reusable
  • Wide Application: These hex flange nuts are suitable for home, automotive, and shop use; Hex flange nuts assortment kit is a great replacement for industrial and construction fasteners, also can be a important accessories in your daily life
  • Size: The hex flange nuts have 6 sizes of 85pcs, M3, M4, M5, M6, M8, M10, the most commonly used stainless steel gasket is packed in a plastic box, and different sizes can meet your different needs
  • Timely Reply: If you have any questions, please contact us by email and we will reply you within 24 hours
No. 7
M8 x 1.25 Black Zinc Finish Durable Flange Nuts 10 Pack
  • PRECISION FIT & COMPATIBILITY: This M8 nut set features a standard M8 x 1.25 thread pitch for a tight, secure hold. Ideal for use with steel spacers, screw nuts, and screw locks in any heavy-duty hardware kit.
  • BLACK ZINC COATED FOR DURABILITY: Each black lock nut is treated with a corrosion-resistant black zinc finish, stronger than black phosphate. Perfect for automotive, construction, or metal nuts in outdoor settings.
  • HEAVY-DUTY STEEL BUILD – GRADE 10.9: Built from premium-grade steel flange, each M8 lock nut resists wear and vibration. Add to your nut pack or screw nut collection for long-term strength and dependability.
  • EASY 13MM DRIVE INSTALLATION: These M8 flange nuts are designed for fast setup with a 13mm wrench or socket. A must-have for DIYers and pros building nut sets, screw nuts, or flange nut kits.
  • 10 PIECE-PACK VALUE: Get 10 black metal M8 1.25 nuts per pack. Ready to drop into your hardware kit. Whether replacing a flange nut or expanding your metal nuts set, this nut pack gets the job done.
SaleNo. 8
Taiss 3160PCS Metric Flange Bolt Assortment Kit,Nuts and Bolts Assortment Kit M2 M3 M4 M5 M6x1.0 M8x...
  • There are 3160-piece in total and 42 different sizes provide exceptional variety,Metric sizing (M2-M10) covers most common applications,Multiple head types (Hex Flange head &socket button & cap head) increase versatility.Saves time and money - Having...
  • Double-layer portable toolbox packaging : 280PCS Flange Bolt Kit and 2880PCS Hex Socket Button & Cap Head Metric Screw Assortment are packed in exquisite hand-held boxes,which are easy to carry and store.Bolts are classified and placed in separate...
  • 280PCS Flange Bolt Kit:10 Sizes Nuts and Bolts Assortment Kit,M6x1.0 bolt (12mm/16mm/20mm/25mm/30mm);M8x1.25 bolt (16mm/20mm/25mm/30mm);M10x1.5 bolt 30mm.Flange Nuts,Flat Washers, Lock Washers.
  • 2880PCS Hex Socket Button & Cap Head Metric Bolts,32 Sizes,M2 (4mm/6mm/8mm/10mm/12mm/16mm);M3 (6mm/8mm/12mm/16mm);M4(8mm/12mm/16mm/20mm) M5(8mm/12mm/16mm/20mm/30mm),Nuts,Flat Washers,Lock Washers.
  • Flange Bolt Kit is Made of 10.9 Grade Alloy Steel,The Inclined Flange Under the Cylindrical Head of Flange bolt increases the torque needed to loosen the bolt;Socket Head Screws,Button Head Cap Bolts and Nuts Kit is Made of 12.9 Grade Alloy Steel,Black...
No. 9
Mrosnail 55PCS Metric Flange Nuts Assortment, M6 M8 M10 304 Stainless Steel Serrated Hex Flange Nuts Kit for...
  • [Premium Stainless Steel Construction]: The Mrosnail 55Pcs Flange Nut Assortment Kit is crafted from high-quality 304 stainless steel, known for its exceptional corrosion, oxidation, and heat resistance. This premium material ensures long-lasting...
  • [Versatile Size Range for Various Applications]: This assortment kit includes three popular metric sizes: M6, M8, and M10, providing 55 pieces in total. The variety of sizes ensures that you are always equipped with the right flange nuts for different...
  • [Enhanced Design for Secure and Efficient Use]: Each flange nut in this kit features a serrated flange design that enhances grip and prevents loosening due to vibration. The hexagonal shape ensures a tight fit and easy installation, while the integrated...
  • [Convenient and Organized Storage Case]: The Mrosnail Flange Nut Assortment Kit is thoughtfully packaged in a durable, re-sealable plastic case with reinforced dividers. This compact storage solution keeps all nuts neatly organized by size, ensuring quick...
  • [Ideal for a Wide Range of Projects]: These stainless steel hex flange nuts are suitable for various applications, including automotive repairs, DIY projects, home improvement, and industrial tasks. Whether you're working on machinery, vehicle...
No. 10
Hard-to-Find Fastener 014973271831 Grade 8 Coarse Hex Flange Nuts, 1/2-13, Piece-8, Yellow
  • Diameter: 1/2"
  • Material: Steel
  • Finish: Yellow Zinc
  • Head Style: Hex Washer (3/4" Wrench)
  • Thread Type: 13 (Coarse)

Last update on 2026-07-18 / Affiliate links / Images from Amazon Product Advertising API

How to Choose the Best Flange Nuts

Material and Coating

The material of a flange nut is critical for its strength and corrosion resistance. Common materials include steel (often zinc-plated for rust protection), stainless steel (for superior corrosion resistance in harsh environments), and brass (for non-sparking applications). The coating, such as zinc or a black oxide finish, further enhances durability and appearance. Consider the operating environment and load requirements when choosing the material and coating.

Flange Diameter and Tooth Type

The flange diameter determines the surface area of contact, which is important for distributing load and preventing damage to the connected materials. Larger flanges are suitable for softer materials or applications requiring greater load distribution. Some flange nuts feature serrations on the underside of the flange. These teeth bite into the mating surface, creating a locking action that resists vibration and prevents loosening. Choose serrated nuts for applications prone to movement or vibration.

Frequently Asked Questions

What is a flange nut?
A flange nut is a type of nut that has a built-in washer, which is a broad flange at one end. This integrated washer provides a wider bearing surface, distributing the load more evenly and preventing damage to the material being fastened.
When should I use a flange nut instead of a regular nut and washer?
Flange nuts are ideal when you need to distribute pressure over a larger area, such as with soft materials like plastic or wood. They also simplify assembly by eliminating the need for a separate washer, and their design can offer better resistance to loosening.
What is the difference between a serrated and non-serrated flange nut?
Serrated flange nuts have teeth on the underside of the flange that dig into the mating surface, providing a locking action that resists vibration and prevents the nut from loosening. Non-serrated flange nuts have a smooth flange and rely on tension alone to stay in place.
Are stainless steel flange nuts suitable for outdoor use?
Yes, stainless steel flange nuts offer excellent corrosion resistance and are highly recommended for outdoor applications or environments exposed to moisture and chemicals. They maintain their structural integrity and appearance over time.