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These silicon bronze hexagonal head fasteners are made from high-quality silicon bronze alloy (mainstream grades C65100 and C65500) through precision forging or machining. Thanks to the scientific ratio of copper and silicon, they offer a balance of corrosion resistance, strength, and versatility, making them a core solution for fastening connections in harsh environments. The products feature a classic and elegant reddish-brown bronze hue, with neat and rounded hexagonal heads, precise and smooth threads, and are free of burrs and pinholes. The surface can be treated to its natural color, polished, or passivated state according to requirements. They require no additional zinc plating or other anti-corrosion treatments, possessing excellent inherent corrosion resistance. Suitable for long-term stable use under various complex working conditions, they combine practicality and durability, and are widely used in high-end industrial fields such as marine, chemical, and electrical industries, as well as special scenarios. They are a preferred alternative to ordinary brass and some stainless steel fasteners.
Manufactured in strict accordance with national and international standards, with a full range of specifications available. Custom sizes can be tailored to meet specific customer needs. Specific standards and specifications are as follows:
National Standards: GB/T 5783 (fully threaded hex bolts), GB/T 5782 (semi-threaded hex bolts), and can also be adapted to alternative standards such as AS 1110.2 and CNS 3122.
International standards: DIN 933, ISO 4017, ASTM B927, ASME B18.2.1, etc., conforming to international manufacturing tolerance standards, with strong interchangeability, and can be adapted to the equipment usage needs of different regions around the world.
Metric: Diameter M5-M48, length 10mm-200mm (longer sizes can be customized, such as 15mm-650mm), thread type is divided into metric coarse thread and metric fine thread, tolerance 6g/6H, full thread and half thread customization are supported.
US Standard (UNC/UNF): Specifications include 1/4", 5/16", 3/8", 1/2", etc., with coarse (UNC) and fine (UNF) threads, and thread accuracy Class 2a. Full or half threads can be customized, such as 3/8"-16 UNC specifications. Length can be customized as needed.
Other parameters: The weight of a single product varies from about 5g to 500g depending on the size, the performance level is 4.8, the head is a standard hexagonal head (single chamfer), the shank can be either fully threaded or partially threaded, and the surface treatment is one of the following: natural color, polished, or passivated.
We support customization of products with special diameters, lengths, thread types, and surface treatments according to customer needs. We also offer customization of specific grades (C65100, C65500) to meet the personalized needs of different scenarios. Custom orders require prior communication and confirmation, and the delivery cycle is approximately 45-60 days depending on the complexity of the customization.
Compared to traditional brass and ordinary stainless steel bolts, this product has irreplaceable advantages in core performance, precisely solving the fastening pain points in harsh environments, as detailed below:
Excellent corrosion resistance: With outstanding core advantages, it can effectively resist the corrosion of seawater, salt spray, sulfides and some acid and alkali media. Its seawater corrosion resistance is far superior to that of 304 stainless steel and ordinary brass. It will not rust or peel off after long-term use in harsh environments such as humidity, high salt and chemical corrosion. A dense oxide film will form on the surface, which will further improve corrosion resistance and durability, greatly reduce the later maintenance cost and replacement frequency, and is suitable for long-term outdoor and corrosive working conditions.
Excellent mechanical properties: tensile strength can reach 370-655MPa, hardness is between 70-110HB, strength far exceeds that of brass and is close to that of 304 stainless steel. It has good load-bearing capacity and fatigue resistance, and can be adapted to heavy load, high pressure and vibration scenarios. It is not easy to deform or break, and can stably withstand long-term mechanical loads, meeting the needs of industrial-grade fastening.
Outstanding multi-functional properties: It has non-magnetic properties and can be used in magnetically sensitive scenarios such as high-frequency devices, explosion-proof equipment, and medical equipment without interfering with the normal operation of the equipment; at the same time, it has good electrical and thermal conductivity, which is better than 304 stainless steel, and can meet the dual requirements of fastening and conductivity; the material is wear-resistant and easy to weld, with strong processing adaptability, and can be further processed and installed according to actual needs.
Excellent cost performance: Although the unit price is in the mid-to-high range, the long-term comprehensive cost of use is far lower than that of ordinary brass bolts due to its ultra-long service life, no need for additional anti-corrosion treatment, and low maintenance cost. Moreover, its performance is superior to most similar products, making it suitable for scenarios with high quality requirements, and its cost performance advantage is significant. At the same time, specifications can be customized according to customer needs to meet diverse application scenarios.
Guaranteed compliance: Manufactured in strict accordance with national and international standards, in compliance with environmental regulations such as RoHS 3 and REACH, free of harmful impurities, and can be used in fields with high requirements for the environmental friendliness of materials, such as food machinery and medical equipment, balancing performance and environmental protection needs.
Material characteristics: The core material is silicon bronze alloy, mainly composed of copper (95%-98%) and silicon (2%-3%), with small amounts of manganese, zinc and other elements added to optimize performance. C65100 is a low-silicon model (silicon content of about 1.5%), focusing on conductivity and solderability, suitable for general applications; C65500 is a high-silicon model (silicon content of about 3%), focusing on high strength and corrosion resistance, suitable for harsh corrosion and heavy-duty applications. Both grades can be selected as needed.
Physical characteristics: Non-magnetic, excellent electrical and thermal conductivity, wear-resistant, easy to weld, wide applicable temperature range, can work stably between -100℃ and +300℃, melting point is higher than most common metals, can be adapted to extreme high and low temperature conditions, and the material does not produce sparks, so it can be used in flammable and explosive environments such as mines and oil fields.
Structural features: Adopts standard external hexagonal head design, compatible with conventional wrench operation, making installation convenient and efficient; The thread has a tolerance of 6g/6H, and is available in two types: full thread and half thread. It is precise and regular, with a tight fit, and is not easy to loosen, which can effectively improve the connection stability and avoid the risk of loosening caused by vibration; The product is finely crafted, with meticulous attention to detail, no burrs or sand holes, and a uniform appearance and color.
Process characteristics: It adopts precision forging or machining process and is annealed. It has high dimensional accuracy, meets international manufacturing tolerance standards, and has strong interchangeability. Different batches of products can be used interchangeably. No additional zinc plating is required for surface treatment. Three methods are available: natural color, polishing and passivation, which can be adapted to different appearance and anti-corrosion requirements. Passivation treatment can further improve corrosion resistance.
Leveraging its superior corrosion resistance, non-magnetic properties, and high strength, this product is widely used in various fields with stringent fastener quality requirements, covering multiple scenarios such as industry, construction, and electrical engineering. Specific applications are as follows:
Marine Engineering Field: As a special fastener for marine environment, it can be used in shipbuilding, dock facilities, seawater treatment equipment, hull and deck fixing, marine platforms, etc. It can effectively resist seawater corrosion, does not rust after long-term immersion, and ensures the structural stability of marine equipment. It is a core fastening component in marine engineering.
Chemical and water treatment fields: It is suitable for chemical pipelines, valves, reaction vessels, sewage treatment equipment, chemical containers, etc. It can resist the corrosion of corrosive media such as acids, alkalis and sulfides, and avoid safety hazards such as equipment leakage caused by fastener corrosion. It can also be used for equipment fastening in the pulp and paper industry.
Electrical and electronic fields: Used in conductive connectors, non-magnetic equipment, high-frequency devices, cable joints, terminals, etc. Non-magnetic and does not interfere with equipment operation. Good conductivity can ensure stable current transmission. It is suitable for precision electrical equipment, explosion-proof electrical equipment and other scenarios. It can also be used for hydraulic pipelines and metal component fastening in aircraft.
Construction and decoration fields: Suitable for coastal buildings, ancient building restoration, outdoor weather-resistant decoration, bridges, photovoltaic support anchor bolts, etc. It is resistant to outdoor salt spray and humid environment corrosion, does not fade or rust, takes into account both practicality and decoration, can be integrated with the overall architectural style, and is also suitable for high-end decorative lines, door and window hardware and other scenarios.
Special industrial fields: It can be used in food machinery, medical equipment, explosion-proof equipment, mining equipment, etc. It is free of harmful impurities, non-magnetic, and spark-free, and is suitable for special environmental requirements. It can also be used for fastening hydraulic and pneumatic systems, condensers, and other equipment, meeting the usage requirements of various special industrial scenarios.
This product uses standardized and meticulous packaging and transportation solutions to ensure product quality throughout the entire process and avoid problems such as damage, moisture, and corrosion during transportation. Specific transportation details are as follows:
Packaging Specifications: The packaging is designed to be moisture-proof and rust-proof. The inner layer is wrapped with moisture-proof paper and rust-proof bags, and the outer layer is wrapped with a thickened cardboard box to prevent moisture and scratches during transportation. The standard packaging is about 25 kg/carton. Customized packaging can be made according to the customer's order quantity and specifications (minimum order quantity is 10,000 pieces). The gross weight of a single product is about 0.05 kg. The product name, specifications, brand, quantity, weight and other labels can be clearly affixed to the packaging.
Storage requirements: The storage environment must be dry, well-ventilated, and cool, avoiding direct sunlight, high temperature and humidity, and contact with acidic or alkaline substances. Shelving should be used for classified storage to facilitate sorting and inventory. Fire prevention, theft prevention, and moisture prevention facilities should be provided to ensure that the quality of products is not affected during storage.
Shipping Method: Choose the appropriate shipping method based on the order quantity. Small orders are delivered by express, which is fast and secure. Large orders are delivered by full truckload, less than container load (LCL), or sea freight (such as Taiwan dedicated line, international sea freight). Full container load is suitable for large quantities and single types of goods, while LCL is suitable for small orders. Sea freight takes about 5-14 days depending on the route. Choose a logistics service provider with relevant transportation experience and familiarity with customs policies to provide door-to-door service and ensure smooth delivery of goods.
Transportation Precautions: Avoid violent collisions and squeezing during transportation to prevent bolt deformation and thread damage; take measures to prevent moisture and corrosion throughout the process and avoid contact with rainwater and seawater; for international transportation, complete commercial invoices, packing lists and other documents are required to ensure smooth customs clearance. The delivery cycle is approximately 5-60 days depending on the order quantity.
The following are genuine user reviews from different industries, covering aspects such as product quality, user experience, and compatibility, for reference only:
- Marine engineering user: "Used for fixing ship decks, it has been immersed in seawater for a long time. After more than half a year of use, there has been no rust or corrosion. The threads are tightly engaged, and the installation is convenient. It is much more durable than the stainless steel bolts we used before. We will continue to purchase it in the future. It has a very high cost performance."
- Chemical Industry User: "These bolts are used for fixing pipelines in reaction vessels. They are suitable for corrosive chemical environments. After more than a year of use, there has been no loosening or corrosion. The material is odorless and free of harmful impurities, meeting the requirements for food-grade chemical equipment. Customer service is enthusiastic, specifications are complete, and customization response is quick."
- Electrical Equipment User: "The non-magnetic effect is excellent. Used for fastening high-frequency devices, it does not interfere with equipment operation at all. The conductivity also meets expectations. The workmanship is exquisite, details are handled well, there are no burrs, installation efficiency is high, and logistics are also fast. Highly recommended."
- Construction Engineering User: "Used for exterior wall decoration of coastal buildings. They are resistant to salt spray corrosion, have a uniform color that matches the architectural style well, and have strong stability after installation. There has been no loosening or fading. The quality is much better than ordinary brass bolts. Although the price is slightly higher, it is very cost-effective in the long run."
- Customization User: "We customized bolts of special length according to equipment requirements. The dimensional accuracy is very high, and they fit the equipment perfectly. The material is C65500 grade, with sufficient strength and excellent corrosion resistance. The manufacturer's service was patient, delivery was timely, and it solved our special fastening needs."
- A long-term customer said: "We have been cooperating for several years. The product quality has always been very stable, and the specifications are complete. Whether it is a regular model or a customized model, it can be delivered on time. The packaging is solid and there is no damage during transportation. The price-performance ratio is outstanding. It is our regular supplier."
Grade selection: For general-purpose applications, C65100 (low silicon, focusing on conductivity and solderability) can be selected; for harsh corrosion and heavy-duty applications, C65500 (high silicon, focusing on high strength and corrosion resistance) is recommended.
Specification selection: The bolt diameter, length, and thread type (full thread/semi thread) need to be confirmed according to the actual requirements of the equipment/structure to ensure compatibility with the equipment and avoid incompatibility affecting use.
Standard selection: Based on the usage scenario, confirm the required standard (national standard/international standard) to ensure product interchangeability and adapt to the fastening requirements of existing equipment.
Storage tips: After receiving the product, store it in a dry, well-ventilated environment, avoiding moisture and contact with acidic or alkaline substances to ensure that the product quality is not affected.
