Carriage Screws

Product introduction

Carriage screw, also known as square neck bolt, is a classic fastener with unique structure and reliable locking. Its most distinctive feature is the one-piece square neck below the bolt head. When installed, the square neck will snap into the prefabricated square hole or be embedded in the connected parts, thereby effectively preventing the overall rotation of the bolt when tightening the nut, achieving efficient unilateral operation. This product is usually made of carbon steel or stainless steel and has a high load-bearing capacity. Its design omits the step of drilling and tapping holes on the installation side, and is often used in conjunction with large timber, metal channel steel and U-shaped parts. Carriage screws are widely used in heavy-duty fields such as building wood structures, guardrail installation, mechanical equipment base fixing, and railway freight yards. With their excellent anti-rotation performance and ease of installation, they can remain stable for a long time even in vibration environments.

 

Product Features

1. Excellent anti-rotation ability: Its core feature is the square neck under the bolt head. During installation, the square neck will snap into the prefabricated square hole or groove of the connected piece, which can effectively prevent the bolt from rotating when the nut is tightened, making unilateral operation possible.

2. Easy installation and improved efficiency: Since the square neck provides an anti-rotation function, you only need to use a tool on one side to tighten the nut during installation, without fixing the bolt head. It is especially suitable for situations where operation can only be done from one side or where space is limited, greatly improving assembly efficiency.

3. Strong load-bearing and shear resistance: The square neck design not only prevents rotation, but also increases the pressure-bearing area of ​​the bolt, allowing it to withstand greater shear force. The connection structure is more stable and reliable, and is especially suitable for working conditions that bear dynamic loads and vibrations.

4. Reliable pre-tightening force maintenance: In long-term vibration environment, its locking performance is stable and not easy to loosen, ensuring the long-term safety and reliability of the connection and avoiding frequent maintenance.

5. Wide application adaptability: often used in conjunction with wood, metal channels, U-shaped parts, etc., it is an ideal choice for construction, wood structures, heavy equipment assembly and other fields.

 

Product application

1. Heavy wooden structure connection: widely used in the connection of heavy wooden structures such as wooden house frames, large beams and columns, wooden bridges, dock platforms, etc. The square neck is stuck in the wood to effectively prevent the bolt from rotating. You only need to tighten the nut on the other end. The installation is very convenient and reliable.

2. Fixing of metal frame and channel steel: It is an ideal choice for connecting metal shelves, equipment racks, pipe support systems and various channel steels (such as U-shaped steel). The square neck is embedded in the slot of the channel steel to achieve quick positioning and firm locking, and can withstand the shear force of the structure.

3. Guardrail and fence installation: It is very common in the installation of balcony guardrails, stair handrails, industrial platforms and various fences. Its single-sided operation simplifies the installation process on the column and effectively resists shaking and rotation during use.

4. Transportation and agricultural equipment: It is often used in the connection parts of trailer bodies, truck beds, agricultural machinery (such as harvesters, tractors) and other equipment. It can withstand severe vibration and impact loads without loosening.

5. Public facilities and building formwork: Park benches, bus pavilions, and formwork support systems for construction sites also often use carriage screws because of their simple structure, durability, and easy maintenance.

 

FAQ

Q: What is the biggest feature of carriage screws? How does it achieve anti-rotation?

A: Its biggest feature is its excellent anti-rotation ability. This is accomplished by a square neck underneath the bolt head. During installation, this square neck will snap into the pre-drilled or punched square holes of the connected parts (such as wood, metal grooves), thereby effectively preventing the entire bolt from rotating when the nut is tightened.

 

Q: Why is it called a "carriage" screw?

A: The name comes from its historical application. It was originally widely used in the manufacture and repair of horse-drawn carriages and agricultural equipment. Its strong and anti-rotation characteristics are ideal for withstanding bumps and vibrations, hence its name and its use today.

 

Q: Can carriage screws and ordinary hexagonal bolts be used interchangeably?

A: Swapping is generally not recommended. Carriage screws are designed for use in situations where anti-rotation and easy one-sided operation are required. If ordinary hexagonal bolts are suitable (operable on both sides), using carriage screws will require processing of additional square holes, increasing costs. On the contrary, when anti-rotation is required, ordinary bolts cannot be effectively locked.

 

Q: In what industries and scenarios is it mainly used?

A: Its applications are very wide, mainly including: building wooden structures: such as wooden houses, beam-column connections. Metal frames: such as shelves, equipment racks, channel steel connections. Guardrails and fencing systems. Transportation: such as trailers, agricultural machinery, railway freight yards. Any heavy-duty connection requiring one-sided fastening and vibration resistance.

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