Carriage bolts, also known as round head square neck screws, are a distinctive type of fastener that combines a rounded head with a square neck under the head. They are categorized into two main types based on head size: large semi-round head carriage bolts, which align with standards GB/T14 and DIN603, and small semi-round head carriage bolts, which correspond to the GB/T12-85 standard. Essentially, a carriage bolt consists of a head and a threaded shaft, requiring a nut to secure two parts with through holes.
Bolts are fundamental in joining two objects, typically using light holes, and are always used with nuts. They feature hexagonal heads that are generally larger for ease of use with wrenches. Carriage bolts are specifically designed for use in grooves, with their square necks catching in the groove to prevent rotation during installation. They can move parallel within the groove, and due to their rounded heads and lack of power tool-friendly features like cross recesses or inner hexagons, they also serve a deterrent role against theft. Befast Co., Ltd offers carriage bolts in materials such as carbon steel, Q235, 45# steel, and stainless steel, with nominal diameters ranging from 5mm to 20mm and lengths from 15mm to 300mm. Surface treatments include galvanizing, chromium plating, copper plating, and surface blackening, with custom sizes available to meet specific customer requirements.
The primary function of carriage bolts is to connect and secure the various parts of a carriage, ensuring its stability and integrity. As crucial components, they connect elements like wheels and frames. Located at the corners of the carriage frame, they are subject to vibration and impact during operation. The proper selection and use of carriage bolts, along with regular inspection and maintenance, are vital for ensuring the safety of carriage travel. Made from high-strength materials, carriage bolts are designed to withstand significant tensile and shear forces. Their round heads and lack of cross-recessed or inner hexagonal designs also provide a measure of anti-theft protection during the connection process.
Carriage bolts are chosen for their ability to tighten and hold parts together by fastening nuts. They must endure substantial tensile and shear forces, necessitating the selection of appropriate specifications and materials. During installation, it's also important to choose the right pads and nuts to ensure the bolts' tightening effect. The materials and shapes of carriage bolts can be tailored to specific needs, considering factors such as the size, load, and road conditions of the carriage, to select bolts with excellent strength, corrosion resistance, and fatigue resistance.
Carriage bolts come in various types for different applications, such as rim bolts, lever bolts, upper beam bolts, and lower beam bolts. Rim bolts are essential for connecting wheels and rims, while lever bolts connect axle shafts and cantilever shafts for wheel suspension and free rotation. Given the large forces they bear, regular maintenance is required, including checking for looseness and replacing any that are found to be loose or missing. Regular lubrication is also necessary to ensure their normal operation and longevity.
In summary, carriage bolts are vital for the safe operation of carriages. Hebei Bentley Technology Co., Ltd not only supports OEM production but also guarantees product quality. To ensure carriage safety, it's essential to use correct installation methods and maintain good maintenance habits.
