Sanwei:Your Professional Stainless Steel Bolt Manufacturer!
Hebei Sanwei Fasteners Co., Ltd. is a high-tech enterprise specializing in the research, development, production, and sale of fasteners, located in Hebei Province, China. Since its establishment,wei has been committed to providing customers with high-quality, high-performance fastener solutions, which are widely used in various fields such as construction, machinery manufacturing, automobile, and power communication.
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Stainless Steel Hex Socket Head Cap Screws DIN912Standard: DIN 912. Name: Stainless Steel Hex Socket Head Cap Screws. Material:Stainless Steel . Grade: SS201,SS304,SS316
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Stainless Steel Carriage BoltsStandard: DIN 603. Name: Carriage Bolts. Material:Stainless Steel. Grade: SS201,SS304,SS316
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Hexagon Head ScrewThread specification:M6-M48Material:S30408Surface treatment:True ColorSurfacetreatment:galvanizeStandard No.:GB5783-86
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Stainless Steel Lifting Eye BoltStandard: DIN580. Name: Stainless steel eye bolt. Material: 304, 316 stainless steel. Grade: A2-70, A4-70
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Galvanized Carbon Steel BoltStandard: DIN931/933. Name: Galvanized carbon steel bolts. Material: carbon steel . Grade: Grade 4.8, Grade 5.8, Grade 8.8
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Black Stainless Steel BoltsStandard: DIN931/933. Name: Black stainless steel bolts. Material: 304, 316 stainless steel. Grade: A2-70, A4-70
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Stainless Steel Automotive BoltStandard: DIN74361. Name: Stainless steel car bolts. Material: 304, 316 stainless steel. Grade: A2 - 70, A4 - 80
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Stainless Steel Square Head BoltsStandard: ASME B 18.2.1. Name: Stainless steel square head bolts. Material: 304, 316 stainless steel. Grade: A2-70, A4-70
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Stainless Steel Flange BoltsStandard: DIN 6921. Name: Stainless steel flange bolts. Material: 304, 316 stainless steel. Grade: A2-70, A4-70
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Stainless Steel Allen Head BoltsStandard: DIN912. Name: Stainless steel hexagon bolts. Material: 304, 316 stainless steel. Grade: A2-70, A4-70
Why Choose Us
OEM/ODM Service
Our customised fasteners are made to your special requirements. It can be fully threaded or partially threaded, and the thread, driving method, material, length, head shape, plating and all these can be specially designed according to your needs.
Good CNC machining technology
From material selection to finished products, Handan Sanwei provides you with comprehensive solutions when it comes to customised fasteners. The fasteners we make are high precision and strong. No matter what kind of precision you need, we can meet it and guarantee your satisfaction.
Strong engineering design team
Our company has an excellent and professional engineering team, and a number of technicians are elites in the industry. The staff always strives to explore new methods and technologies. From the selection of metals and special alloy materials to the finished fasteners, we can solve all aspects of the whole project engineering.
Professional Testing Laboratory
Quality assurance and testing is an important part of producing fasteners. Handan Sanwei has a specialised quality testing laboratory with spectrometers, hardness testers, tensile testers, salt spray test chambers and other equipment, where raw materials and final products are strictly tested. In addition, the company also has experienced testing experts who use professional methods to comprehensively test the fasteners and finally give you a detailed test report.
Digital Quality Control System
We rely on our self-developed full-process digital quality inspection system to strictly control every step from raw materials entering the factory to finished products being shipped. This system will always monitor the quality of the products to ensure that each batch of products meets the industry standards and complies with customer requirements. In addition, it collects and feeds back data in real time, giving you a clear understanding of product quality.
Excellent Corrosion Resistance
Stainless steel bolts are highly resistant to corrosion due to their high chromium content. This property makes them particularly suitable for use in environments exposed to moisture, chemicals, and other corrosive elements. The chromium in stainless steel forms a passive layer of chromium oxide on the surface, which protects the bolts from rust and corrosion.
Durability
Stainless steel bolts are known for their durability and longevity, maintaining their strength over long periods, even in harsh conditions. This durability reduces the need for frequent replacements, making them a cost-effective choice in the long run, especially in applications where maintenance access is difficult or costly.
Aesthetic Appeal
With a bright, shiny finish, stainless steel bolts are often preferred for applications where appearance matters. They do not tarnish or discolor over time, maintaining a clean and professional look. This aesthetic appeal is beneficial in architectural projects and visible structures.


Temperature Resistance
Certain grades of stainless steel, such as 316, can withstand high temperatures without losing strength or becoming brittle. This makes stainless steel bolts suitable for applications involving high heat, such as in industrial ovens or high-temperature processing plants.
Easy to Maintain
Stainless steel bolts are also easy to maintain. They require very little maintenance and can last many years without needing replacement. This makes them a cost-effective choice for construction applications.
Environmentally Friendly
Stainless steel bolts are environmentally friendly. They are 100% recyclable and can be melted down and reused without losing their original properties.
Specification
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Standard |
DIN580/603/912/931/933 |
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Name |
Stainless steel bolt |
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Material |
304, 316 stainless steel |
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Grade |
A2-70, A4-70,Grade 4.8, Grade 5.8, Grade 8.8 |
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Nominal Diameter |
M2-M64 |
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Pitch |
0.4-6 |
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Surface treatment |
Passivated, polished,ZP,YZ |
Construction Industry
Stainless steel bolts are widely used in construction due to their high strength and durability. They hold together beams, columns, and other components of infrastructure buildings. They are also used to construct bridges, railways, and airports. Due to their corrosion-resistant nature, these bolts are ideal for structures in harsh environments, such as coastal buildings.
Automotive Industry
Stainless steel bolts are used in the automotive industry for various applications such as brake systems, fuel systems, and engine components. They hold together different parts of vehicles, including body panels, frames, and exhaust systems. Stainless steel bolts are ideal for automotive applications because of their high shear strength, corrosion-resistant nature, and ability to withstand high temperatures.
Manufacturing Industry
Stainless steel bolts are used in manufacturing for various applications such as machinery, equipment, and tools. They are used to fix parts, attach components, and hold together assemblies. Stainless steel bolts are also used in the food and beverage industry due to their hygienic properties, making them ideal for processing equipment and packaging machinery.
Marine Industry
The marine industry requires materials that can withstand harsh seawater and corrosive environments. Stainless steel bolts are perfect for these applications because of their excellent corrosion resistance properties. They are used to hold together components and structures such as wires, cables, and riggings. They also find use in fishing equipment, boat trailers, and hull fastenings.
Home and Decoration Industry
Stainless steel bolts are used in the home and decoration industry for various applications such as furniture, fixtures, appliances, and lighting. They hold together furniture parts like bed frames, tables, and chairs. Due to their aesthetic appeal, stainless steel bolts are also used in decorative hardware, such as hinges, door handles, and locks.
Stainless Steel Bolt Production Process
The production process of stainless steel bolts involves several steps, encompassing raw material preparation, machining, heat treatment, surface treatment, and final inspection and packaging.




Raw Material Preparation: Stainless steel bolts are typically made from stainless steel wire, often of grades like 304 or 316. The wire is cut or drawn to the required length.
Cold Heading: The stainless steel wire undergoes cold heading, a process in which it is cold-forged to form threads. Cold heading helps enhance the strength and hardness of the bolt.
Heat Treatment: The bolts go through heat treatment, including quenching and tempering. Quenching involves rapid cooling to adjust the bolt's crystalline structure, increasing its hardness. Subsequent tempering improves toughness to prevent brittle fractures.
Turning: The bolts are turned on a lathe to ensure their shape and dimensions conform to standards. This machining step can be automated using machinery.
Grinding: To improve surface smoothness and precision, the bolts undergo grinding. This step removes surface roughness, enhancing overall surface quality.
Surface Treatment: Stainless steel bolts require surface treatment to increase corrosion resistance. Common methods include electroplating (e.g., zinc plating), applying anti-corrosion coatings through spray painting, or using physical vapor deposition (PVD) techniques.
Inspection and Quality Control: Rigorous inspection and quality control are conducted at each production stage. This includes testing dimensions, threads, hardness, tensile strength, and other parameters to ensure compliance with standards and specifications.
Packaging: Once all production steps are completed, the bolts are appropriately packaged to prevent damage during transportation and storage. The choice of packaging materials depends on the type, size, and application of the bolts.
Top Best Practices for Installing Stainless Steel Bolts: Ensuring Proper Installation and Maximum Performance
Before you start your bolting project, it’s essential to inspect your bolts for any defects or damages. Stainless steel bolts are durable but not indestructible, so ensure they are free of any cracks, burrs, or deformations. Verifying that they match the intended application is essential, considering factors such as bolt length, thread type, and diameter.
When installing your stainless steel bolts, don’t rush to tighten them. If you over-tighten them, they are susceptible to breaking or snapping. On the other hand, if you under-tighten them, they may not hold up to the expected load, leading to poor performance. To ensure the bolts are tightened correctly, use a calibrated torque wrench to get the recommended torque value.
During installation, ensure you apply lubrication on the threads to avoid galling, which is a common problem in stainless steel bolts. Galling arises when there is excessive friction between the bolt and the nut surface, causing the threads to seize up. Lubrication reduces friction on the threads, reducing the likelihood of galling and making the tightening process more manageable.
Stainless steel bolts are susceptible to corrosion and may rust if exposed to moisture or other corrosive elements. Therefore, ensure you store your bolts in a clean, dry environment. Additionally, handling them with clean gloves will prevent oil or dirt residue from contaminating the bolts’ surface, leading to corrosion.
After installation, inspecting your bolts frequently is vital to ensure they remain secure and undamaged. Check for any signs of corrosion, cracks, or wear and tear. Additionally, you should perform periodic maintenance, lubricating the bolts and applying anti-seize, if necessary.
Packaging and Shipping

FAQ
We're professional stainless steel bolt manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to wholesale customized stainless steel bolt made in China here from our factory. Contact us for quotation.
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