Truss-head screws

What are truss-head bolts and where are they used?

Round-head screws are special screws that are characterized by their flat, round heads. This design ensures that the head of the screw protrudes only minimally above the surface of the workpiece after installation. The flat heads of the round-head screws also provide a larger contact surface, which means that the pressure is distributed more evenly and the workpiece is not damaged.
Truss-head screws are often used in areas where a flat and aesthetically pleasing surface is important. These include furniture construction, where the flat heads ensure a smooth surface, which is particularly important for visible connections. In electronics, truss-head bolts ensure secure fastenings without damaging the sensitive components. In mechanical engineering, truss-head bolts are used to securely connect components and ensure even load distribution. Round-head screws are also widely used in vehicle construction, particularly in the automotive industry and in aircraft construction, due to their reliable and space-saving fastening properties.
Truss-head bolts therefore offer a reliable and aesthetically pleasing fastening solution in many areas of application.

What types of truss-head bolts are there?

Truss-head bolts are available in different materials, thread types and head designs to meet a wide range of requirements. Materials such as steel, stainless steel and brass offer specific advantages: steel screws are robust and versatile, stainless steel screws are corrosion resistant for humid or aggressive environments and brass screws are suitable for decorative purposes and applications with electrical conductivity. Additional surface treatments such as galvanizing increase durability and protect against corrosion. In terms of thread types, full threads offer maximum holding force, while partial threads enable more precise assembly. Different head designs, such as the standard flat round head for an aesthetic appearance or smaller heads for space-saving applications, ensure adaptability in a wide range of constructions.
Each of these types of truss-head bolts is designed for specific applications and environmental conditions to ensure optimum performance and reliability.

Are there accessories for truss-head bolts?

Yes, there are various accessories for flat round screws that make their application and fastening easier and more efficient. These include:

• Washers: These are often used to increase the bearing surface of the screw, distribute pressure more evenly, and protect the surface of the workpiece. They come in various materials such as steel, stainless steel, brass, and plastic, as well as in different shapes like flat, curved, or serrated.
• Nuts: Nuts are used in combination with screws to ensure a firm and secure connection. There are different types of nuts such as hex nuts, wing nuts, self-locking nuts, and cap nuts. Each type offers different advantages in terms of holding force, handling, and safety requirements.
• Cover caps: These are used to cover the head of the screw to achieve an aesthetically pleasing appearance and protect the screw from contamination and damage. Cover caps are usually made of plastic and come in various colors.
• Seals: In cases where a waterproof or airtight connection is required, seals are used. They are often made of rubber, silicone, or other elastic materials and ensure that no liquid or air can enter through the screw connection.
• Locking rings and washers: These accessories prevent the screw from loosening on its own due to vibrations or dynamic loads. Locking rings are mainly installed in grooves or special recesses on the screw, while locking washers are placed under the screw head or nut.
• Press-in nuts and threads: In thin-walled materials or soft workpieces, press-in nuts or press-in threads can be used to create a stable and durable threaded connection. These elements are pressed into the material and provide a resilient threaded connection.

What should I bear in mind when using truss-head bolts?

When using flat round screws, there are several aspects to consider to ensure they are used optimally and fulfill their function. Here are some important points:

• Material selection: Choose the appropriate material for the screw based on the application and environmental conditions. Steel screws are robust and versatile, stainless steel screws offer corrosion resistance, brass screws are decorative and conductive, and plastic screws are lightweight and corrosion-resistant.
• Length and diameter: Make sure to select the correct length and diameter of the screw to ensure a secure connection. Screws that are too short do not provide enough holding power, while screws that are too long can damage the structure.
• Pre-drilling: In many cases, it is advisable to pre-drill the workpiece to avoid splintering or tearing of the material and to make screwing easier.
• Surface treatment: Consider the surface treatment of the screws to provide additional protection against corrosion and wear. Galvanized, nickel-plated, or phosphated screws are examples of surface treatments that can extend the lifespan of the screws.
• Torque: Use the correct torque when tightening the screws. Too high a torque can damage the screw or the material, while too low a torque can make the connection unreliable.
• Use of accessories: Use appropriate accessories such as washers, nuts, and seals to enhance the functionality and safety of the connection. Washers distribute pressure, nuts secure the connection, and seals protect against fluid ingress.
• Safety precautions: For critical applications, particularly in electronics and vehicle manufacturing, safety precautions such as locking rings or self-locking nuts should be considered to prevent unintentional loosening of the screws.
• Regular inspection: Regularly inspect the fasteners, especially in applications subjected to vibrations or dynamic loads, to ensure that the screws remain tight and secure.

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