Description
Product Overview
The 8‑set M6 U‑bolt kit from Otoolling is engineered for demanding fastening tasks across marine, automotive, and industrial environments. Each package delivers eight square‑shaped U‑bolts measuring 25 mm × 70 mm, eight matching frame plates, sixteen washers, sixteen nuts, and a dedicated wrench, ensuring a complete solution for every installation scenario. Constructed from 304 stainless steel, the bolts resist corrosion, rust, and the harsh salt‑water exposure typical of boat trailer applications, while maintaining structural integrity under heavy loads.
Beyond the core components, the kit’s design emphasizes precision threading and a robust square profile that distributes stress evenly across the fastening surface. This geometry reduces the likelihood of deformation or slippage, especially when securing square or rectangular frames on trailers, chassis, or custom rigs. The included hex‑style nuts and frame plates simplify alignment, allowing technicians to achieve a tight, secure fit with minimal adjustment time.
Every element of the kit is sized for compatibility with standard M6 hardware, making it a versatile choice for a wide range of equipment. The wrench is calibrated to the bolt head dimensions, eliminating the need for additional tools and streamlining the assembly process. The comprehensive nature of the set reduces inventory complexity for workshops and DIY enthusiasts alike, delivering a ready‑to‑use solution that saves both time and money.
![[Product front view showing all components]](https://www.ourstores.store/wp-content/uploads/2026/08/2d939ffd02644376bec006463886bf3d.jpg)
Usage
These U‑bolts excel in boat trailer applications where secure attachment of the trailer frame to the axle is critical. The stainless‑steel construction ensures that the bolts will not seize or corrode even after prolonged exposure to moisture, road salt, and marine environments. Installers can rely on the included wrench to achieve the correct torque without slipping, which is essential for maintaining trailer stability at high speeds.
In addition to marine use, the kit is well‑suited for automotive projects such as mounting engine components, securing suspension brackets, or attaching custom roll cages. The square U‑bolt shape provides a larger bearing surface than traditional round bolts, distributing load more evenly and reducing stress concentrations on the attached parts.
Industrial settings benefit from the kit’s durability when fastening equipment frames, conveyor components, or heavy‑duty machinery housings. The corrosion‑resistant properties of 304 stainless steel extend the service life of the fasteners, lowering maintenance costs and downtime. For users who require a reliable, all‑in‑one fastening solution, this kit offers the flexibility to address a broad spectrum of tasks without the need for additional purchases.
Why Choose Us
Otoolling’s commitment to quality is reflected in the rigorous manufacturing processes applied to each bolt. The 304 stainless steel is sourced from certified suppliers and undergoes a thorough passivation treatment to enhance its resistance to pitting and intergranular corrosion. This attention to material integrity ensures that each bolt meets or exceeds industry standards for tensile strength and fatigue performance.
Our kits are assembled with precision, guaranteeing that every component matches the specified dimensions and thread tolerances. This level of consistency reduces the risk of mismatched parts, which can lead to premature failure or unsafe installations. By providing a complete set—including nuts, plates, washers, and a wrench—we eliminate the guesswork often associated with sourcing individual components from multiple vendors.
Customer support is a cornerstone of the Otoolling experience. Should any issue arise, our technical team is available to provide guidance on installation, torque specifications, and maintenance best practices. We also offer a straightforward warranty that covers material defects, reinforcing our confidence in the product’s longevity and performance.
Key Features
- Complete 8‑set kit eliminates the need to purchase separate fasteners or tools.
- 304 stainless steel construction provides superior corrosion resistance for marine and outdoor use.
- Square U‑bolt design offers a larger bearing surface, reducing stress on attached components.
- Precision‑threaded nuts and plates ensure a secure, tight fit with minimal adjustment.
- Dedicated wrench and comprehensive after‑sales support simplify installation and maintenance.
FAQ
What size bolts are included in the kit?
The kit contains square U‑bolts sized at M6 × 25 mm × 70 mm, which are compatible with standard M6 hardware and suitable for a variety of trailer and frame applications.
Can these bolts be used in saltwater environments?
Yes. The bolts are made from 304 stainless steel, which offers excellent resistance to rust and corrosion, making them ideal for marine and coastal settings.
Do I need any additional tools to install the kit?
No additional tools are required. Each kit includes a wrench that matches the bolt head size, allowing you to achieve proper torque without extra equipment.
Is there a warranty on these U‑bolts?
Otoolling provides a limited warranty covering material defects. If a bolt fails due to manufacturing issues, you can contact our support team for a replacement.
How many washers and nuts are included?
The package includes sixteen washers and sixteen hex nuts, providing two washers and two nuts per U‑bolt for optimal load distribution and secure fastening.




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