Best U-Bolts of 2025

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

* We independently evaluate all recommended products and services. If you click on links we provide, we may receive compensation.

U-Bolts are essential components in various industrial and scientific applications. These sturdy and durable fasteners are designed in a U-shape, making them ideal for securing pipes, rods, and other cylindrical objects. Made from high-quality materials such as stainless steel or galvanized steel, U-Bolts offer excellent resistance to corrosion and provide reliable support. With their versatile design, they are commonly used in construction, automotive, and plumbing industries. Whether you need to secure equipment or create a stable connection, U-Bolts are a reliable choice for any industrial or scientific project.

At a Glance: Our Top Picks

uxcell U-Bolts with Nuts and Washers Cover #TOP 1
uxcell U-Bolts with Nuts and Washers
ftb score rating icon 9.9
Dunzy 4 pcs Zinc U Bolts Cover #TOP 2
Dunzy 4 pcs Zinc U Bolts
ftb score rating icon 9.8
uxcell 1.22" Round U-Bolts Cover #TOP 3
uxcell 1.22" Round U-Bolts
ftb score rating icon 9.6

Top 10 U-Bolts

#TOP 1

uxcell U-Bolts with Nuts and Washers

a21012900ux0085
Silver
M6x20mmx50mm
uxcell U-Bolts with Nuts and Washers Cover
uxcell Round U-Bolts 4 Sets 0.79"(20mm) Inner Width 50mm Length Steel M6 with Nut, Plate, Washer

The uxcell U-Bolts Set includes four durable steel U-bolts with a 20mm inner width and a total length of 50mm. Each U-bolt features an M6 thread diameter, ensuring a secure fit for your projects. The set comes with hex nuts and round washers, making installation straightforward and efficient. With a galvanized finish, these U-bolts resist rust and corrosion, offering long-lasting performance. Ideal for fastening components to pipes or wood, this set is perfect for various applications, such as connecting boats, pipelines, and trailers.

What We Like
Rust and corrosion resistance
Easy installation
Durable steel construction
Versatile applications
#TOP 2

Dunzy 4 pcs Zinc U Bolts

Dunzy
Dunzy-MX-0564
silver
3/8'' x 3'' x 7''
Dunzy 4 pcs Zinc U Bolts Cover
4 pcs Square U Bolt in Zinc U Bolt Zn, Industrial and Scientific Supplies U Bolts for Boat Trailer Tube, Rectangular Wood and Metal Objects (3/8'' x 3'' x 7'')

The Dunzy Zinc U Bolts come in a convenient pack of four, making them perfect for various fastening needs. Each U bolt measures 3/8 inch in diameter, 3 inches wide, and 7 inches long, which is ideal for securing 3 x 3 inch square objects. Made from sturdy carbon steel and coated with zinc, these bolts resist rust and corrosion, ensuring durability even in wet conditions. Additionally, the set includes frame plates and nuts, providing everything you need for installation. It's recommended to use lubricant during installation for easier handling and to prolong the life of the bolts.

What We Like
Durable carbon steel construction
Rust and corrosion resistant
Includes necessary installation hardware
Convenient pack of four
#TOP 3

uxcell 1.22" Round U-Bolts

a21012900ux0130
Silver
M8x31mmx90mm
uxcell 1.22" Round U-Bolts Cover
uxcell Round U-Bolts 4 Sets 1.22"(31mm) Inner Width 90mm Length Steel M8 with Nut, Plate

The uxcell U-Bolts are designed with a 1.22-inch inner width and a total length of 90mm, making them perfect for various fastening needs. With an M8 thread diameter, these bolts fit securely onto rods measuring 31mm in size. The included hex nuts, sized at 14 x 6mm, ensure a tight grip when you need to secure components. Additionally, the galvanized steel construction provides excellent rust and corrosion resistance, extending the life of your projects. Whether you're working on boats, pipelines, or trailers, these durable U-bolts offer a reliable solution for your fastening tasks.

What We Like
Durable galvanized steel
Rust and corrosion resistant
Easy installation
Versatile applications
#TOP 4

Therwen 16 Sets M6 U Bolts

Therwen
GFA-Therwen-1346
silver
M6 x 40 mm x 90 mm
Therwen 16 Sets M6 U Bolts Cover
Therwen 16 Sets Round U Bolts Zinc Plated Steel M6 Round Bend U Clamp with Nut Plate Washer (M6 x 40 mm x 90 mm)

The Therwen U Bolts Set is a complete fastening solution for your projects. It comes with 16 U bolts, plates, nuts, and washers, so you can start working right away without needing to buy extra parts. Each U bolt is sized conveniently at 1.57 inches wide and 3.54 inches long, making them versatile for various applications. Made of galvanized steel, these bolts resist rust and corrosion, ensuring durability over time. Whether you're a DIY enthusiast or a contractor, you’ll appreciate the reliability and security this set offers for fastening materials like wood and pipes.

What We Like
Complete fastening package
Durable rust-resistant materials
Convenient sizes for various projects
Versatile for multiple applications
#TOP 5

National Hardware Square U Bolt #535

N222-364
Zinc Plated
5/16" x 2" x 5"
National Hardware Square U Bolt #535 Cover
National Hardware N222-364 2192 Square U Bolts in Zinc, #535-5/16"x2"x5"

The National Hardware U Bolt is a reliable solution for securing items to both wood and metal surfaces. Made from durable stainless steel, it ensures long-lasting use whether you apply it indoors or outdoors. The included nuts make installation a breeze, allowing you to set everything up quickly and efficiently. If you need additional support, you can easily pair this U bolt with National's compatible plates for enhanced stability. This versatility makes it a great choice for various projects around your home or workshop.

What We Like
Durable stainless steel construction
Easy installation with included nuts
Suitable for indoor and outdoor use
Compatible with additional plates
#TOP 6

Prime-Line U-Bolts

PRIME-LINE
9071969
Zinc
5/16 in. -18
Prime-Line U-Bolts Cover
Prime-Line 9071969 U-Bolts, Round Bend, 5/16 In.-18 X 1-3/8 In. X 2-1/2 In. - for 1 In. Pipe, Zinc Plated Steel (10 Pack)

Introducing the Prime-Line U-Bolts, the perfect solution for securing pipes, conduits, cables, or other cylindrical objects. These U-bolts are made from high-quality zinc-plated steel, ensuring durability and corrosion resistance. With a diameter-thread size of 5/16 inch-18 and an inside width compatible with 1-inch pipes, these U-bolts are versatile and can be used for various applications. They come with a U-bolt plate and two nuts for easy installation. The coarse thread type and blunt point style make them suitable for a wide range of projects. Whether you're a DIY enthusiast or a professional, the Prime-Line U-Bolts offer convenience, reliability, and peace of mind.

What We Like
Durable and corrosion-resistant
Versatile and compatible with various pipe sizes
Easy to install
#TOP 7

National Hardware U Bolt N222-562

N222-562
Zinc Plated
1 Count (Pack of 1)
National Hardware U Bolt N222-562 Cover
National Hardware N222-562 DP2190BC U Bolt Zinc plated, 5/16" x 2-1/2" x 5"

The National Hardware U Bolt is a versatile fastening solution, perfect for securing items to pipes, wood, and more. Its durable steel wire construction ensures that it can withstand both interior and exterior conditions, making it suitable for a variety of applications, including automotive and plumbing needs. With the included plate and nuts, you can enjoy hassle-free installation, saving you time and effort. This U Bolt provides a reliable way to keep your projects secure, giving you peace of mind whether you’re working at home or in an industrial setting.

What We Like
Durable steel construction
Easy installation with included hardware
Versatile for multiple applications
Suitable for indoor and outdoor use
#TOP 8

Stainless Steel Square U-Bolt with Nuts and Plate

CDOKY
5438MHEX6S6D5M2DZ13T950
2" W x 4.3 L"
Stainless Steel Square U-Bolt with Nuts and Plate Cover
Square U-Bolt, Stainless Steel Square Bend U Bolts with Nuts and Frame Plate for Automobiles Trailer, Ski Boat, or Sailboat Trailer, 2" W x 4.3 L,M10*50 * 120

Get the job done quickly with the 304 Stainless Steel Square U-Bolt. This rust-resistant and durable U-bolt comes with additional accessories, including 8 hexagon nuts and 4 plates, all galvanized for extra protection. The U-bolt has a good grip and performs well in harsh weather conditions, making it suitable for automobiles, trailers, boats, and other industrial applications. With a size of 2" W x 4.3 L" and a thread length of 2 inches, it is perfect for 2" x 2" square beams and shafts.

What We Like
Comes with additional accessories
304 Stainless Steel material is anti-rust and corrosion-resistant
Good grip and performs well in harsh weather conditions
#TOP 9

Homaisson 4 Pcs Square U Bolts

Homaisson
MZ63B35GX5S8817198XI
4PCS
Homaisson 4 Pcs Square U Bolts Cover
4 Pcs Square U Bolts, 3/8"×3"×7" Stainless Steel U Clamp Bolts with Nuts and Frame Plates, Sturdy Square U Bolts for Boat Trailer, Tube (4PCS)

The Homaisson Square U Bolts come with four robust U bolts, frame plates, and hex nuts, providing everything you need for your fastening tasks. Made from high-quality stainless steel, these bolts offer incredible strength, making them ideal for heavy-duty applications without worrying about deformation or rust. Their dimensions are perfect for fitting 3x3" square objects, ensuring versatility for various projects. Additionally, the user-friendly design allows for a secure installation, enhanced by the included hardware. You’ll appreciate the convenience of using these U bolts for all your fastening needs.

What We Like
Durable stainless steel construction
Complete with nuts and plates
Versatile for various applications
Easy installation process
#TOP 10

National Hardware N222-455 2193BC U Bolt in Stainless Steel

N222-455
Stainless Steel
1 Count (Pack of 1)
National Hardware N222-455 2193BC U Bolt in Stainless Steel Cover
National Hardware N222-455 2193BC U Bolt in Stainless Steel,#526-5/16"x1-3/4"x4-1/4"

The National Hardware U Bolt is a versatile fastening product designed for a variety of applications. Whether you need to secure something to a pipe, wood, or other surfaces, this U Bolt is up to the task. It is suitable for automotive, plumbing, and other home and industrial uses, making it a handy tool to have around. The plate and nuts are included, saving you time and effort in finding compatible accessories. Made from stainless steel, this U Bolt is not only durable but also resistant to corrosion, making it excellent for marine and outdoor applications. With the National Hardware U Bolt, you can trust that your fastening needs are well taken care of.

What We Like
Versatile
Suitable for various applications
Includes plate and nuts
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What is a U-bolt used for?

A U-bolt is a type of industrial fastener that has a U shape with two threaded arms extending from a curved base. It is commonly used to support pipework or attach parts to poles, beams, or walls. The U shape provides stability and keeps the bolt firmly in place, adding support to the structure.

2. How do you specify a U-bolt?

To specify a U-bolt for pipes, you need to provide the diameter of the pipe, the material, the tangent length, and either the load or thickness of the U-bolt rod. These specifications ensure that the U-bolt is the correct size and strength for the intended application.

3. Which is better Grade 5 or Grade 8 bolts?

Grade 8 bolts are stronger than Grade 5 bolts as they have undergone a more extensive hardening process. Grade 8 bolts are typically used in demanding applications, such as automotive suspensions, where high strength is required. However, the choice between Grade 5 and Grade 8 bolts depends on the specific needs of the application.

Editor's Notes

During our u-bolt research, we found 24 u-bolt products and shortlisted 10 quality products. We collected and analyzed 6,686 customer reviews through our big data system to write the u-bolts list. We found that most customers choose u-bolts with an average price of $19.21.

The u-bolts are available for purchase. We have researched hundreds of brands and picked the top brands of u-bolts, including uxcell, Dunzy, Therwen, National Hardware, CDOKY. The seller of top 1 product has received honest feedback from 18,493 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.