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U-bolts are essential for securing leaf springs to your vehicle's axle, ensuring ride stability and load-carrying capacity. Selecting the correct U-bolt is crucial for safety and proper vehicle function, as an ill-fitting or low-quality part can compromise performance and even lead to component failure.
Package contents: The package includes 4 sets M6 round U-bolts (including round bolts, nuts, washers and frame plates), the total length of u-bolts is 25 mm(1 inch), the inner width is 70 mm(2-3/4 inch).
Material: This round bend U clamp is made of steel and galvanized surface, not easy to deformation, corrosion resistance and rust resistance, can be used outdoors for a long time.
Load capacity: U-shaped bolt of steel structure, using bending molding processing technology, high hardness, good tensile strength, high bearing capacity, can be used to fix pipes, plates, practicability.
Wide application: M6 U-bolt is used to fix or attach the locking parts to the pipe, wood, and more, suitable for the connection of ships, trailers, industrial steel structure pipes.
Easy installation: Just fix the U-bolt to the part to be fixed, then install the washers, and finally tighten the nuts at both ends to complete the installation, the installation is very convenient.
U-Bolts SIZE：the square U bolts measures about M8 in diameter, about 52mm/2 inch in I.D width and about 100mm/3.9 inch in O.D length, The OD size of your project can be used to match the suitable U-bolt ID before ordering, please confirm the size before
What's included : you will get 4 pcs of U bolts 2 inch wide, plus 4 pcs of frame plates，8 pcs of washer and 8 pcs of nuts, 1 Pcs wrench，a complete set can meet your use and replacement
Materials : U-Bolts Made of 304 stainless steel, strong, have great performance in rust resistance, moisture resistance, and corrosion resistance
Broad utilization : the square U bolt clamp is practical and widely applied in various fields such as industry, manufacturing, maintenance, automotive industry, garment production, etc., which are ideal for fastening pipes, wood, trailers and more
Suggestions for use: it is recommended to use oil when installing this U bolt to prevent wear; Can use match manual wrench when fasteners nuts， Avoid using high-speed poweltools or impact tools to break the threads
U-Bolts SIZE: the U bolts measures about 5/16" in diameter, with inner dimensions of 2"W x 2-11/16"L and thread length of 1". Please confirm the required size before ordering to avoid delays due to mismatched specifications
You Will Get: 4PCS U bolts 2 inch wide, 4PCS frame plates, 8PCS flat washer, 8PCS nuts
304 Stainless Steel: This round U clamp is made of 304 stainless steel, not easy to deformation, have great performance in rust resistance, moisture resistance, and corrosion resistance, can be used outdoors for a long time
Wide Applications: The U bolt clamp is designed for fastening products to pipe, wood, boat trailers etc. Suitable in automotive, tube and other home and industrial applications, including marine and other outdoor applications
Installation Tips: When measuring the required length, reserve extra allowance for nuts and washers.Avoid impact/electric wrenches—they may cause bolt wear, seizing, or breakage. Proper manual tightening ensures a secure, long-lasting installation.
Feature: The square U bolts threads are 3/8 " in diameter, 3" in width, and 7 "in length, suitable for 3 x 3" square objects, and can be used to secure pipes, plates, and planks; Please check the dimensions before ordering
Premium Quality: Made of stainless steel, these U-bolts have excellent load-bearing, strong and durable, reliable and durable, rust resistant and corrosion resistant, also suitable for rainy and humid environment
U Shape Design: This design can lock the connector fixed on the square object, will not be locked because the surface area of the locked object contact is too small and cause to locking failure; You can also cut square bolts in half to use as a 90-degree...
Complete Set: Includes 4 U bolts, 4 frame plates and 8 nuts to meet your use needs, the attached nuts and frame plates are a good complement to make the installation process simple and clear; Use lubricants to prevent wear when installing
Wide Application: U-bolts can be used in domestic and industrial applications,including manufacturing, maintenance, automotive sector, clothing production, etc., also nice for fastening tubes, wood, trailer and more, providing a secure fix without being...
Size：M10 Square U-Bolt with inner dimensions of 2-1/2"W x 5"L and thread length of 2-3/4". Please confirm the required size before ordering to avoid delays due to mismatched specifications.
What's Included：2 x U Bolts 2-1/2 Inch Wide, 2 x frame plates, 4 x flat washers, 4 x lock washer and 4 x nuts, 1 x wrench. All accessories are complete, no extra purchases needed, and ready for installation right out of the box.
Materials：U-Bolts Made of 304 stainless steel, strong, have great performance in rust resistance, moisture resistance, and corrosion resistance.
Wide Applications：Suitable for securing pipes, wood and steel. Compatible with RV bumpers, boats, outdoor brackets, industrial equipment and more.
Installation Tips：Reserve installation allowance for nuts and washers when measuring the required length. It is recommended to tighten manually with the included special wrench; avoid using impact wrenches or electric wrenches to prevent bolt wear...
4 pack of Square U-Bolt: 1/2 x 3-1/16 x 4-5/16 inch and hardware for 3x3 cross member
U-Bolts made from heavy-duty, durable galvanized steel
Zinc coated to prevent rusting and suitable for marine trailers and motor boats in saltwater, freshwater, coastal conditions, and utility/land trailers in icy conditions
U-bolt Size: 1/2" D x 3-1/16" W x 5-5/16" L, thread length, thread length: 2-1/2" inches, suitable for 3" x 3" square beams and shafts, (order Please check the measurement size carefully before)
Hot Dipped Galvanized : U-bolts are made of Hot Dipped Galvanized，The white surface is a thick galvanized layer, which enhances the rust and corrosion resistance of the U-bolt
You can get: (4) U-bolts, (8) hexagon nuts, (8) flat washers, (8) lock washers, these additional accessories are also Hot Dipped Galvanized. With these, you can spend less time repairing and more time boating
Tips:Use a hand wrench or socket ratchet when installing the nut. Do not use high-speed power tools or impact tools to tighten the nuts
After-sales service: Please rest assured, if you have any questions, please feel free to send us an email via Amazon. We will solve it for you within 24 hours
Thread Dia.: M6; Fit Rod Size: 16mm / 0.63"; Rod Diameter: 5.2mm / 0.2"; Total Length: 46mm / 1.81"
Hex Nut Size: 10 x 5mm / 0.39" x 0.2"(Hex Width*H); Frame Plate Size: 50 x 18 x 2mm/ 1.97" x 0.71" x 0.08"(L*W*T)
Round Washers Size: 18 x 6 x 1mm / 0.71" x 0.24" x 0.04"(OD*ID*T); Package Content: 4 x U-Bolt, 8 x Nuts, 8 x Round Washers, 4 x Plates
Material: Steel construct u bolt, galvanized surface treatment, bending forming processing technology with great performance in antirust and corrosion resistance, high hardness and good tensile strength.
Application: U-bolt is used to fasten or attach locking components to pipes, wood, etc. Just insert and tighten the nuts at both ends. It is suitable for the connection of boats, pipelines, trailers, and industrial steel structure conduits.
U-Bolts SIZE: the U bolts measures about 1/4" in diameter, with inner dimensions of 1-1/4"W x 2-1/4"L and thread length of 1-1/4". Please confirm the required size before ordering to avoid delays due to mismatched specifications
You Will Get: 6PCS U bolts 1-1/4 inch wide, 6PCS frame plates, 12PCS flat washer, 12PCS nuts
304 Stainless Steel: This round U clamp is made of 304 stainless steel, not easy to deformation, have great performance in rust resistance, moisture resistance, and corrosion resistance, can be used outdoors for a long time
Wide Applications: The U bolt clamp is designed for fastening products to pipe, wood, boat trailers etc. Suitable in automotive, tube and other home and industrial applications, including marine and other outdoor applications
Installation Tips: When measuring the required length, reserve extra allowance for nuts and washers.Avoid impact/electric wrenches—they may cause bolt wear, seizing, or breakage. Proper manual tightening ensures a secure, long-lasting installation.
Last update on 2026-09-01 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best U-Bolts
Understanding U-Bolt Types
U-bolts come in various shapes and sizes to accommodate different axle and spring configurations. The most common types include round U-bolts, which have a curved bend, and square U-bolts, featuring a sharper, 90-degree bend. There are also 'read-eye' or 'ribbed' U-bolts, which have specific features for enhanced grip. Knowing the shape of your existing U-bolts or the required profile for your vehicle is the first step in selection.
Key Measurement Considerations
Accurate measurements are paramount when purchasing U-bolts. You'll need to determine the inside width (the distance between the legs) and the inside length (from the bottom of the bend to the top of the legs). Additionally, note the diameter of the U-bolt material itself, often specified in fractions of an inch. Always double-check these measurements against your vehicle's specifications or the old parts before ordering.
Material and Finish
U-bolts are typically made from high-strength steel to withstand significant stress and vibration. Look for options made from hardened steel for maximum durability. The finish is also important for corrosion resistance. Common finishes include zinc plating, black oxide, or raw steel. Zinc plating offers good protection against rust in most environments, while black oxide provides a durable, non-reflective finish. For heavily exposed or corrosive conditions, consider stainless steel options.
Hardware and Kits
U-bolts are usually sold individually or as part of a kit. Kits often include the necessary nuts and washers, which are essential for proper installation and load distribution. Ensure that any included hardware is also made of high-quality materials that match or exceed the strength of the U-bolt. If buying U-bolts individually, confirm you have the correct size and type of nuts and washers separately.
Frequently Asked Questions
What is the purpose of a U-bolt?
A U-bolt's primary function is to secure the vehicle's leaf springs to the axle housing. This connection is vital for maintaining the integrity of the suspension system and ensuring proper load distribution.
How do I measure for the correct U-bolt size?
You need to measure the inside width and inside length of the U-bolt, as well as the diameter of the bolt's material. Referencing your vehicle's service manual or measuring the original U-bolt accurately will ensure a proper fit.
What are the common U-bolt shapes?
The most common shapes are round, which have a curved bend, and square, featuring a sharp 90-degree bend. 'Read-eye' or 'ribbed' designs are also available for specific applications requiring enhanced grip.
Should I buy U-bolts individually or in a kit?
Kits are often recommended as they typically include the necessary nuts and washers, ensuring all components are compatible and properly sized. If buying individually, make sure to purchase the correct hardware separately.
What material is best for U-bolts?
High-strength steel is standard for durability and load-bearing capacity. For increased longevity and resistance to corrosion, consider hardened steel or stainless steel options, especially in harsh environments.
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