Aluminum Carriage Bolts

In modern industrial design, weight reduction and corrosion resistance are two core requirements. While traditional carbon steel carriage bolts offer considerable strength, they often fail to meet the demands of weight-sensitive or highly corrosive environments. Aluminum Carriage Bolts are specialized fasteners developed to address this industry pain point.  Thanks to the lightweight and excellent corrosion resistance of aluminum alloy, they have become an ideal connection solution for new energy, marine engineering, and transportation sectors.

We are a source factory with over 15 years of experience in fastener research and manufacturing, serving customers in the new energy, marine engineering, and transportation fields for many years. We have a deep understanding of the core needs and pain points of these industries. The core objective of our aluminum carriage bolts is to replace heavy steel parts, helping customers reduce overall equipment weight, improve energy efficiency, and solve the problem of fastener wear in highly corrosive environments, providing reliable connection assurance for various demanding projects.

Core Product Advantages

1. High-Quality Aluminum Alloy Material, Balancing Lightweight and Performance

Complete range of material grades to meet diverse needs: We mainly use high-quality aluminum alloys from the 5052, 6061, and 6063 series, precisely matching the requirements of different application scenarios. 5052 aluminum is a magnesium alloy aluminum plate with extremely strong corrosion resistance, especially suitable for marine environments and chemical equipment; 6061/6063 aluminum is a silicon-magnesium alloy, which, after heat treatment, possesses good comprehensive mechanical properties and oxidation resistance, making it a common choice for industrial structural components.

Significant lightweight advantage: The density of aluminum is only 1/3 that of steel. Using our aluminum bolts can significantly reduce the weight of the connection parts. This advantage is particularly crucial for products with strict weight requirements, such as drones, racing cars, and portable devices, directly contributing to improved equipment battery life or operational flexibility.

2. Classic Square Neck Anti-Loosening Design, Efficient and Worry-Free Installation

Reliable self-locking function: Continuing the classic design essence of carriage bolts, the square neck below the bolt head can be directly inserted into the hole wall of the connected part during installation, effectively preventing the bolt from rotating with the nut, avoiding misalignment and slippage during the fastening process, and ensuring connection stability. Supports convenient single-sided operation: During installation, only one wrench is needed to tighten the nut, eliminating the need for additional screw fixing on the other side. This feature is particularly advantageous in confined spaces such as inside equipment or at the bottom of enclosures where using two wrenches is impractical, significantly improving construction efficiency and reducing labor costs.

3. Excellent corrosion resistance, combining aesthetics and practicality

Corrosion-resistant and durable: Aluminum alloy itself possesses excellent oxidation resistance. In harsh environments such as humid and salt spray conditions, it will not produce red rust like iron products, preventing corrosion from damaging the bolt's performance and avoiding contamination of the connected components, thus greatly extending its service life.

Dual characteristics of decoration and protection: The surface of aluminum is easy to process and can form a dense oxide film through anodizing. This not only improves surface hardness but also allows for dyeing in various colors such as black, red, blue, and gold, combining protective and decorative effects, making it particularly suitable for high-end applications where appearance is important.

Core Technical Parameters

Typical Application Scenarios

With years of industry service experience, our aluminum carriage bolts have successfully met the practical needs of various fields, becoming the preferred fasteners for many customers:

1. Marine and Shipbuilding Engineering: Widely used for connecting yacht decks, cabin interiors, and aluminum alloy docks. The excellent seawater corrosion resistance of 5052 aluminum alloy makes it a cost-effective alternative to stainless steel, capable of withstanding long-term erosion in marine environments;

2. New Energy and Transportation: Suitable for fixing electric vehicle battery trays, charging pile casings, and high-speed rail/subway interior components. While ensuring connection strength, it effectively reduces vehicle weight, directly contributing to improving the range of new energy vehicles;

3. Photographic Equipment and Display Stands: Used in tripods, photographic background stands, exhibition trusses, and other products. The non-magnetic properties of aluminum avoid interference with photographic equipment, and the lightweight design facilitates handling and operation by photographers and construction workers;

4. High-End Decoration and Woodworking: Suitable for connecting outdoor patios of villas and high-end furniture. The anodized black or champagne-colored bolts have an exquisite appearance and can perfectly blend with aluminum railings and high-grade wood, enhancing the overall decorative texture.

Company Strength and Quality Assurance

We are Ningbo Gangtong Zheli Fasteners Co., Ltd. Since our establishment in 2001, we have built a mature full-chain system for fastener research and development, production, and sales. Our factory is located in the Zhenhai Chemical Industrial Zone of Ningbo, and our headquarters and foreign trade sales department are located in the Ningbo Jiangdong Eastern Business Center. The factory covers an area of 15,000 square meters, with a stable monthly production capacity of 2,000 tons and annual sales exceeding US$15 million. The company is equipped with a professional R&D team, a full-process supply chain management system, and large-scale warehousing facilities, focusing on the production of various fasteners. We can provide integrated MRO procurement and distribution services for metal fasteners, comprehensively meeting customers' diverse procurement needs.

In the fastener industry, quality directly relates to safety in use. We strictly control product quality throughout the entire process, ensuring that every bolt is reliable and durable:  During raw material warehousing, each batch of aluminum is subjected to spectral analysis to precisely control its chemical composition; during production, dimensional accuracy and thread quality are fully inspected to prevent unqualified semi-finished products from entering the next process; in the finished product stage, rigorous salt spray testing (neutral salt spray test) and tensile testing are conducted to verify corrosion resistance and mechanical strength. The company fully implements the ISO 9001 quality management system standard and can provide material certificates (MTC) according to customer requirements, ensuring that the product's chemical composition and mechanical properties fully meet the standards. At the same time, our products comply with the RoHS environmental directive, containing no harmful substances, ensuring both environmental and human safety.

Our product range is extensive, covering heavy-duty hexagonal bolts, heavy-duty hexagonal nuts, threaded rods, studs, washers, screws, etc., made of materials including carbon steel, alloy steel, stainless steel, and various aluminum alloys. We strictly adhere to international standards such as DIN, ISO, EN, JIS, ASTM/ANSI/ASME/SAE, BS, and AS. Our products are exported to North America, Europe, Australia, Southeast Asia, the Middle East, Latin America, and many other regions, and are suitable for various fields such as building steel structures, bridges, oil pipelines, mechanical equipment, ships, and railways.

Reasons to Choose Us

1. Direct supply from the factory, excellent cost-effectiveness: As a physical manufacturer located in Ningbo, Zhejiang, the fastener capital of China, we have advanced cold heading, tapping, and surface treatment production lines, achieving independent production throughout the entire process from raw materials to finished products. Without intermediaries, we can provide customers with highly competitive ex-factory prices. Standard specifications are readily available in stock, allowing for quick response and delivery.

2. Professional technology, efficient response: Our engineering team has extensive industry experience and has been deeply involved in the field of Aluminum Carriage Bolts for many years. We can accurately complete non-standard customization (OEM/ODM) services based on drawings or samples provided by customers; we can quickly respond to and provide targeted solutions to technical problems encountered by customers during use.

3. Global service experience, worry-free cooperation: With many years of experience in the international market, we have established a complete logistics and distribution system and after-sales service system. We are familiar with the standard requirements and market demands of different regions, and can accurately match the procurement needs of global customers, committed to establishing long-term and stable cooperative relationships with our customers.