What are the differences between carriage bolts and ordinary bolts?

1. Appearance structure
Head shape
The head of a carriage bolt is generally round or square, and the head size is large, and the shape is similar to the wheel of a carriage, which is also the origin of its name. This unique head design can provide a larger contact area and increase the stability of the bolt on the connecting parts.
The head shape of ordinary bolts is varied, and the common ones are hexagonal head, round head, countersunk head, etc. The head of the hexagonal head bolt is hexagonal, which is convenient for tightening with tools such as wrenches; the head of the round head bolt is hemispherical and has a smoother appearance; the head of the countersunk head bolt can be embedded in the surface of the connecting part to make the connection surface smoother.
Screw shape
The screw part of the carriage bolt usually has no special structure, and is generally cylindrical with threads on the surface. The shape of the thread is similar to that of ordinary bolts, but the thread of the carriage bolt may be thicker to provide higher connection strength.
The screw shape of ordinary bolts is also quite diverse. Some bolts may have some special structures on the screw, such as different thread pitches and anti-slip patterns on the screw. These special structures can meet different connection requirements.
2. Usage and characteristics
Application scenarios
Carriage bolts are mainly used in connection occasions that require a large contact area and stability, such as the base of mechanical equipment, the connection of large steel structures, etc. Due to its large head, it can better disperse the load and prevent the connection parts from loosening or deforming when subjected to force.
Ordinary bolts are widely used in various connection occasions, and can meet different connection requirements according to different head shapes and thread specifications. For example, hexagonal head bolts are often used for connections that require a large tightening torque; round head bolts are often used for connections with high appearance requirements; countersunk head bolts are often used in occasions where the connection surface needs to be flat.
Connection method
Carriage bolts are usually used in conjunction with nuts to achieve the function of connection and tightening by tightening the nuts. In some special cases, carriage bolts can also be directly screwed into threaded connection parts.
The connection method of ordinary bolts is also mainly used in conjunction with nuts, but some ordinary bolts can also use other connection methods, such as self-tapping bolts can be directly screwed into connection parts without threads, and expansion bolts can be connected through the expansion effect of expansion tubes.
3. Performance parameters
Strength grade
The strength grade of carriage bolts and ordinary bolts may be different. Generally speaking, carriage bolts have a relatively high strength grade and can withstand large loads. This is because carriage bolts are usually used to connect large mechanical equipment or steel structures, which require high strength and reliability.
The strength grade of ordinary bolts varies according to different applications. Some ordinary bolts may have a lower strength grade and are suitable for general connection occasions; while some high-strength bolts have a strength grade comparable to that of carriage bolts or even higher.
Corrosion resistance
Carriage bolts and ordinary bolts may also differ in corrosion resistance. Some carriage bolts may use special materials or surface treatment processes to improve their corrosion resistance. For example, stainless steel carriage bolts have good corrosion resistance and are suitable for humid and corrosive environments.
The corrosion resistance of ordinary bolts depends on their materials and surface treatment. Some ordinary bolts may use surface treatment processes such as galvanizing and chrome plating to improve their corrosion resistance. But in general, the corrosion resistance of ordinary bolts may not be as good as that of carriage bolts.
There are certain differences between carriage bolts and ordinary bolts in terms of appearance structure, usage characteristics and performance parameters. When choosing bolts, you should choose the appropriate bolt type according to the specific connection requirements and use environment to ensure the reliability and safety of the connection.
If you want to know the difference between carriage bolts and ordinary bolts, please contact Xianggu Hardware Products, we will do our best to help you!