High Strength Alloy Steel Square Head Bolt

Product introduction

Square head bolt (half thread) is a mechanical fastener that combines easy installation and strong locking properties. Its most notable feature is that the bolt head adopts a standard square design, which is sharply different from the common hexagonal head. The main advantage of this design is that ordinary wrenches or hammer tools can be used during installation, which can withstand extremely large tightening torques and effectively prevent slipping. It is especially suitable for working conditions that require vigorous tightening or where space is limited and it is difficult to use a hexagonal wrench. The product adopts a "half-thread" design, that is, only the end section of the screw part is threaded, and the rest is a smooth rod. This structure allows the unthreaded section to fit closely with the mounting hole, accurately position and withstand shear force; while the threaded section can penetrate deep into the nut or connected parts to achieve firm axial tension. With its excellent torsion resistance and shear resistance, square head half-thread bolts are widely used in fields that require extremely high strength and reliability, such as building steel structures, railway tracks, agricultural machinery, and heavy equipment foundation fixing. They are ideal for heavy-duty connection scenarios.

 

Product features

1. Excellent anti-skid and high torque carrying capacity

Its core feature is its square head design. Compared with the hexagonal head, the square head can form a larger contact surface and bite angle with the wrench tool, effectively preventing slippage during the tightening process, and can withstand higher tightening torque to ensure the reliability of the connection.

 

2. "Half-tooth" structure that combines precise positioning and effective locking

The "half-thread" design refers to the combination of the polished rod part of the screw and the threaded section. The polished rod section can closely match the mounting hole, play a role in precise positioning and centering, and can effectively withstand shear force; the threaded section is specifically responsible for providing strong axial tensioning force to achieve firm locking.

 

3. Easy to install and suitable for narrow spaces

The square head design allows the use of open-end wrenches or hammer tools for installation, requiring lower installation space. It is more convenient and faster to operate in grooves or narrow locations than the hexagonal head, improving assembly efficiency.

 

4. Solid structure and high reliability

Usually made of high-strength carbon steel or alloy steel, the overall structure is strong. It is designed to withstand vibration and shock loads and maintain long-term stability of the connection in heavy-load environments.

 

Product application

1. Fixing the foundation of heavy machinery and equipment

Application scenarios: Widely used in fixing the bases of heavy equipment such as large machine tools, stamping equipment, injection molding machines, and wind power generation foundation rings. Advantages reflected: The half-thread polished rod section closely matches the foundation hole, which can accurately position and effectively withstand the huge shear force and vibration generated by the operation of the equipment; the square head allows the application of huge torque, ensuring an absolutely firm connection and preventing the equipment from shifting.

 

2. Connection between building and steel structure

Application scenarios: Used to connect large steel beams and column nodes, as well as to fix factory steel structures, bridge support components, etc. Advantages reflected: Polished rod sections can play a key role at connection points that require high strength and shear resistance. The square head design facilitates installation and tightening using an open-end wrench in a narrow space, with high reliability.

 

3. Railway and rail transit systems

Application scenario: It is a classic application of rail pressure plate bolts, which are used to firmly fix the rails to sleepers or track plates. Advantages: It can withstand the huge impact, vibration and lateral shear force caused by the passing train. The square head facilitates quick installation and maintenance, and can effectively prevent loosening in a vibrating environment.

 

4. Agricultural and construction machinery

Application scenarios: Used for the connection of chassis, suspension systems and working devices of tractors, harvesters, excavators and other equipment. Advantages: Its solid structure and anti-vibration performance can adapt to harsh working conditions and strong vibrations in field operations, ensuring the safety of key connection parts.

 

FAQ

Q: Why are these bolts designed with "square heads"? What is the difference between it and a hexagonal head?

A: The square head design has two main advantages: anti-slip and high torque: The square head has a larger contact surface with the wrench and a better bite angle, making it less likely to slip and round when extreme tightening torque is applied, providing higher tightening reliability. Good space adaptability: Just use an open-end wrench or a torx wrench to clamp both sides of the head to operate. It requires less installation space and is especially suitable for use in grooves or narrow locations.

 

Q: What is the special purpose of the “half tooth” design?

A: The "half-thread" (i.e. partial thread) design achieves precise division of functions: polished rod section: achieves transition or interference fit with the mounting hole, plays a role in precise positioning and centering, and can effectively withstand lateral shear forces and prevent dislocation of connectors. Threaded segment: Specially responsible for providing axial tightening force and tightly locking the connected parts together through the nut.

 

Q: What precautions should be taken during installation?

A: Ensure that the polished rod section participates in shearing: During installation, the polished rod section must pass through the holes of all connected parts so that it can truly resist shearing. Use the right tools: Be sure to use a wrench that exactly matches the size of the square head to avoid damage to the edges of the head caused by mismatched tools. Apply sufficient torque: Take advantage of its high torque and tighten according to the specified torque value to ensure that the preload force is in place.

Internal Plum Blossom-Shaped Pointed Screw

Hexagonal Hollow Fine Thread Screw

Carbon Steel Dacromet Eccentric Screws For Metal Joints

One-Slot Reverse Thread Screw

Stainless Steel Stepped Slotted Screw For Machinery Assembly

Color-Plated Cross Step Screws