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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.
Size：M10 Square U-Bolt with inner dimensions of 1-1/2"W x 3-3/8"L and thread length of 2-1/2". Please confirm the required size before ordering to avoid delays due to mismatched specifications
What's Included：2 x U Bolts 1-1/2 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...
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...
U-Bolts SIZE：the square U bolts measures about M8 in diameter, about 40mm/1.5 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...
What's included : you will get 4 pcs of U bolts 1.5 inch wide, plus 4 pcs of frame plates，8 pcs of flat washer，8 pcs of lock 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
Reliable hardware - the components in this leaf spring axle U-bolt kit are designed to securely hold the leaf spring or leaf spring bundle to the underside of a vehicle or trailer axle
Check fit - carefully review the dimensions of the leaf springs that will be used and other relevant application details to select the right type and size U-bolt kit for your needs
Durable construction - the components in this kit are engineered from quality materials for reliable performance and long service life
Trustworthy quality - backed by a team of product experts in the United States and more than a century of automotive experience
Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool
Rust and Corrosion Resistant Finish - Made from steel with a galvanized surface coating to resist rust, corrosion, and abrasion. Nuts and washers are also crafted from durable materials. Ideal for trailers, solar frames, environments
Strong Load Support - Features 8mm or 12mm thick threads and rigid U-shape design. Maintains grip under tension and doesn’t deform under pressure during transport or outdoor use
Complete Hardware Set - Includes 6 U-bolts, 6 steel backing plates and 12 hex nuts. All components match in size and thread, minimizing the need to source missing or incompatible parts
Fits 4" Square Bumpers or Posts - Each U-bolt has a 3/8" diameter, 4" inner width, and 5" thread length, sized to fit most 4"x4" square RV bumpers, trailer frames, wood posts, or utility structures without drilling
Wide Application - Widely used to secure solar panels, toolboxes, fenders, climbing nets, and winches. Apply lubricant during installation to reduce thread wear and extend product life
Assembly Tips and Inspection Note - Use hand tools to avoid thread damage; power tools may strip the nuts. Please inspect the package upon arrival to ensure all nuts, plates, and washers are present before use
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
Complete Package: this product includes 16 pieces of U bolts, 16 pieces of plates, 32 pieces of nuts, and 32 pieces of washers; You have everything you need to start fastening and securing immediately
Ideal Size: these M6 pipe clamps measure about 1.57 inches/ 40 mm in inner width, about 3.54 inches/ 90 mm in length, and about 0.2 inches/ 5.2 mm in diameter, you can apply these bolts to your projects conveniently
Accessories Size: our plate is about 2.76 x 0.79 x 0.08 inches/ 70 x 20 x 2 mm (L x W x T), hexagonal nut about 0.39 x 0.2 inches/ 10 x 5 mm (W x H), and the round washer is about 0.71 x 0.24 x 0.04 inches/ 18 x 6 x 1 mm (OD x ID x T), All the sizes are...
Resistant to Rust: our U bolts are made of steel and have a galvanized surface, making them resistant to rust, corrosion, and wear; The nuts and washers are also made of durable materials that ensure long term use
Versatile Application: our U bends can be applied to fasten or attach locking parts to pipes, wood, and other materials; This product is ideal for DIY enthusiasts, contractors, and anyone who needs reliable and secure fastening
U-Bolts SIZE: Thread Dia. : M8; Fit Square Rod Size: 30mm / 1.2"; Rod Diameter: 5mm / 0.2"; Total Length: 50mm / 2"；Hex Nut: 10 x 5mm / 0.39" x 0.2"(Hex Width*H); Frame Plate: 60 x 21 x 2mm / 2.36" x 0.8" x 0.08"(L*W*T); Washer ID: 9mm / 0.35"
Square U-Bolts Material: Made of 304 stainless steel, strong and durable, have great performance in rust resistance, moisture resistance, and corrosion resistance.
Feature: The surface without burr and thread good grip, u clamp still perform well in rainy and humid seaside environment.
Application: Square U-Bolt Used on fix or connect the locked parts to rectangular wood and metal objects, such as cars, RVs, sailboat trailers, pipe, tube, plumbing and other Industrial Applications.
Package Content: 4 x U-Bolt, 8 x Nuts, 8 x Round Washers, 4 x Plates.
Last update on 2026-07-18 / 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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