DIN 603 Carriage Bolts - China Suppliers & Factory Offering Grade 4.8 to 12.9, Various Materials & Surface Treatments

Grade Options: 4.8, 8.8, 10.9, 12.9 | Material Choices: Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, 42Crmo | Surface Treatments: Blackened, Electrogalvanized, Dacromet, Hot-dip Galvanized, and more!

As a leading China supplier and factory of high-quality carriage bolts, we offer a diverse range of products, including large half round head carriage bolts (meeting GB/T14 and DIN603 standards) and small half round head carriage bolts (meeting GB/T12-85 standards). These robust fasteners consist of a rounded head and a cylindrical body with external threads, designed to be used with nuts for securely fastening two components with through holes. Enhance your projects with our durable and reliable carriage bolts, perfect for various applications.

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Product introductionintroduction

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Generally speaking, bolts are used to connect two objects, usually through light holes, and need to be used in conjunction with nuts. They do not serve as a single connection. Tools usually use a wrench. The head is mostly hexagonal and generally larger. Carriage bolts are used in grooves, and the square neck is stuck in the groove during installation to prevent the bolt from rotating. Carriage bolts can move parallel in the groove. Due to the circular shape of the head of the carriage bolt, there is no design of a cross groove or an internal hexagon that can be used as an auxiliary tool, and it can also play a role in preventing theft during the actual connection process.

How to use carriage boltuse

Application scenarios of semi-circular head bolts

Half round head bolts are commonly used for hinged connections, including the following application scenarios:

  • 1. Mechanical equipment connection: Half round head bolts are often used to connect components such as shafts and swing arms of mechanical equipment for articulated motion.
  • 2. Structural connection: Half round head bolts can also be used for structural connections, especially in areas that require flexible connections, such as wall panels, ceilings, and doors and windows.
  • 3. Transmission connection: Half round head bolts can also withstand transmission force, so they are used in the connection of transmission systems.
Advantages and disadvantages of semi-circular head bolts

Compared to ordinary bolts, half round head bolts have the following characteristics:

OUR AdvantagesAdvantages

  • 1. Hinged Connection: It can achieve hinged connection. The design of the head of the half round head bolt makes it easy to make hinged connections, which ordinary bolts cannot achieve.
  • 2. Easy Installation: Half round head bolts can be installed with just an appropriately sized pliers, without the need for special installation tools.
  • 3. High Strength: Compared with ordinary bolts of the same specification, half round head bolts have higher strength and can withstand larger loads.
However, half round head bolts also have some drawbacks:
  • 1. Not easy to disassemble: Due to the special design of the head of the half round head bolt, special tools and techniques are required for disassembly.
  • 2. Thread is prone to damage: The threaded part of the half round head bolt is prone to damage, which may limit its reusability.
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Frequently Asked Questions (FAQ)
What is the purpose of the square neck on a carriage bolt?
The square neck of a carriage bolt is designed to be stuck in a groove during installation. This prevents the bolt from rotating, allowing it to move parallel within the groove.
How do carriage bolts help prevent theft?
Carriage bolts have a smooth, circular head without a cross groove or internal hexagon. Because there is no design to accommodate auxiliary tools on the head, it makes unauthorized disassembly difficult, thereby preventing theft.
Where are semi-circular head bolts typically used?
They are commonly used for hinged connections in mechanical equipment (such as shafts and swing arms), structural connections (like wall panels, ceilings, doors, and windows), and transmission system connections.
What advantages do semi-circular head bolts offer?
They easily achieve hinged connections that ordinary bolts cannot. They are also easy to install using basic tools like pliers and provide higher strength to withstand larger loads compared to ordinary bolts of the same specification.
What are the drawbacks of using semi-circular head bolts?
The primary drawbacks include difficulty in disassembly, which requires special tools and techniques, and a threaded portion that is prone to damage, potentially limiting the bolt's reusability.

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