Nut

They are made from high-quality carbon steel and stainless steel substrates through multiple processes, suitable for fastening needs in various fields such as machinery manufacturing, construction engineering, power equipment, and the automotive industry.

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Bolt

They are an improved version of large hexagonal high-strength bolts, widely used in various heavy-duty steel structure projects due to their convenient construction and reliable fastening performance.

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OUR LATEST PRODUCTS

High-Quality Four-Corn...

# I. Core Advantages 1. Precise Structural Design, Strong Welding Stability The product adopts an integrated four-corner molding structure. Compared to traditional hexagonal nuts, the four-corner design increases the contact area with the workpiece, resulting in more even force distribution during welding and effectively preventing welding deformation and displacement. A pre-drilled welding guide groove at the bottom of the nut facilitates even filling of the solder, forming a strong weld ...
Refined Hot-Dip Galvan...

# Hot dip galvanized nuts have the following advantages 1. Good durability: In suburban environments, the standard hot-dip galvanized anti rust thickness can be maintained for more than 50 years without the need for repair; In urban or coastal areas, the standard hot-dip galvanized rust prevention layer can be maintained for 20 years without the need for repair. 2. Low processing cost: The cost of hot-dip galvanizing for rust prevention is lower than that of other paint coatings. 3. Good r...
High-Quality Hex Nut M...

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High-Quality Hex Weld ...

# Functional configuration Hexagonal welded nuts serve as connections. Use a welding machine to connect the hexagonal welding nut to the mother body, and then use screws to fix the required object. Generally used in conjunction with spot welding machines, it has good welding performance and fast efficiency. This type of nut is widely used in industries such as automotive seats, sheet metal chassis and cabinets, molds, ships, railways, etc. Product features Hexagonal welded nuts solve ...
High-Quality Anti-Loos...

# Product Introduction Ningbo Mohai Fasteners Co., Ltd.’s anti-loosening nuts are precision fasteners specifically designed to solve the problem of loosening under vibration conditions. They are made from high-quality carbon steel and stainless steel, suitable for high-frequency vibration scenarios in automobiles, construction machinery, rail transportation, and power equipment, providing reliable protection for critical structural connections. Key advantages of the product: Utilizi...
High-Quality Din 6923 ...

# Usage characteristics of flange nuts 1. Tubing: Use a pipe cutter or grinding wheel cutting machine (the cutting blade should be dedicated) to vertically cut stainless steel pipes according to the required length, clean the burrs at the end, and round them; 2. Welding: The left and right conical flange plates (with grooves, specifically designed for embedding flange gaskets on both sides) are welded to the two pipe ports that need to be connected using tungsten inert gas arc welding (TIG...
High-Quality Galvanize...

# Product Introduction Galvanized nuts produced by Ningbo Mohai Fasteners Co., Ltd. are precision fasteners that combine high-strength connections with excellent corrosion resistance. They are made from high-quality carbon steel and stainless steel substrates through multiple processes, suitable for fastening needs in various fields such as machinery manufacturing, construction engineering, power equipment, and the automotive industry. Key advantages: The surface is treated with hot-dip ga...

High-Quality Cotter Bo...

# Core Structure A typical structure includes a pin shaft, mounting block, connecting rod, and movable nut. The pin shaft surface is often coated with a plastic sealant to reduce wear. The right end is fixed to the mounting block, which has a cross-shaped mounting groove and houses the connecting shaft and movable rod. The movable rod has anti-slip textures. The left end of the connecting rod has threaded grooves and linearly arranged fixing holes to accommodate different installation size...
High-Quality Double-En...

# Core materials and features Material: 45# steel (8.8 grade), 40Cr alloy steel (10.9 grade). Features: High tensile strength: 10.9 grade bolts have a tensile strength of ≥1040MPa, suitable for heavy loads; No risk of hydrogen embrittlement: blackening treatment avoids electroplating hydrogen embrittlement, suitable for precision equipment; Adjustability: The length of the middle light rod can be customized to meet different installation requirements. Functions and applicable scenarios ...
High-Quality Expansion...

# Key Parameters and Materials/Processes Mainstream Specifications and Standards Specification Range: Metal Expansion Bolts: Thread size M6-M24, length 60mm-200mm (commonly M8×80, M10×100, M12×120), expansion tube diameter 2-4mm larger than the screw; Plastic Expansion Bolts: Size M4-M12, length 30mm-100mm, suitable for light-duty fixing needs; Chemical Anchors: Size M8-M30, length 100mm-300mm, extra-long sizes can be customized according to load-bearing requirements. Implementation Standa...
DIN 912 Refined Hexago...

# Characteristic Q235 wire is commonly used for hex screws, and of course, iron screw wire is also used. The wire used for these screws can determine some of the characteristics of hex screws. The first one is that the hardness of stainless steel screws is relatively high, but if it is made of iron, the hardness is significantly worse, which is related to the wire of the iron itself. The texture of iron itself belongs to a relatively soft category, which cannot be compared to stainless ste...
High-Quality Carriage ...

# Core Structure and Design Advantages 1. Structural Features Head: Smooth hemispherical (some sizes are flattened round), without grooves or sharp edges, resulting in a smooth surface after installation, preventing snagging on clothing or cables, and reducing damage from external impacts. Neck: A square neck is located below the head, which is the core anti-rotation structure of the carriage bolt. Its side length matches the bolt diameter (e.g., the square neck of an M8 bolt is approximat...
DIN933 304 A2-70 Hexag...

# Products Description The A-level regulations are: d ≤ 24mm and l ≤ 10d or l ≤ 150mm (whichever is smaller); The regulations for Class B are: d>24mm or l>10d or l>150mm (whichever is smaller). Among them, d represents the thread diameter, and l represents the bolt length. Different product grades have corresponding values for opposite edges s, diagonal e, thickness k, and length tolerance. The general thread diameter specification of DIN 933 bolts is M3-M64, and the common carbon steel pe...
High-Quality Brace Man...

# Core Classifications and Common Specifications Main Types: Tie rods are divided into straight tie rods and diagonal tie rods. Straight tie rods are mostly made of φ12 round steel, and there are two common processes: one is to process 11.8mm diameter round steel with reduced diameter at both ends and then threaded; the other is to directly process 10.6mm diameter round steel. They are mainly used for horizontal connections between adjacent purlins. Diagonal tie rods are often used in conj...
High-Quality Welding S...

# Materials and Key Performance Characteristics Common Materials: For general applications, low-carbon steels such as SWRCH15A and ML15AL are often used due to their moderate cost and good weldability. Stainless steel is used in applications requiring corrosion resistance, such as food processing and medical equipment. Aluminum welded studs are used in some lightweight applications. Surface treatments such as galvanizing or copper plating are often applied to enhance corrosion resistance. ...

ABOUT US

Ningbo Mohai Fastener Co., Ltd. is a modern high-tech enterprise integrating R&D, production, manufacturing and sales of high-standard fasteners. With years of in-depth cultivation in the fastener industry, the company has developed into a benchmark enterprise with full industrial chain service capabilities by virtue of its accurate grasp of industry trends and continuous investment in technological innovation. The production base is located in Yongnian District, Handan City, Hebei Province, known as “China’s Fastener Town”, which boasts significant industrial cluster advantages and improved supporting facilities.