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DIN 603 Carriage Bolts - China Suppliers & Factory for High-Grade Fasteners (4.8, 8.8, 10.9, 12.9)
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DIN 603 Carriage Bolts - China Suppliers & Factory for High-Grade Fasteners (4.8, 8.8, 10.9, 12.9)

Our carriage bolts, available in grades 4.8, 8.8, 10.9, and 12.9, are manufactured from high-quality materials such as Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, and 42Crmo. We offer various surface treatments including blackened, electrogalvanized, Dacromet, hot-dip galvanized, and standard galvanized finishes to suit your specific needs.

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These carriage bolts are categorized into large half round head (complying with GB/T14 and DIN603 standards) and small half round head options (adhering to GB/T12-85 standards). As a leading China supplier and factory of fasteners, our carriage bolts feature a unique design consisting of a head and a cylindrical body with external threads, requiring a nut for effective fastening and securing of two components with through holes. Trust our expertise and quality for your fastening solutions.

    Product introduction

    introduction
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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 bolt

    use
    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.

    OUR Advantages

    Advantages

    Compared to ordinary bolts, half round head bolts have distinct characteristics, advantages, and limitations.

    Key Advantages
    • 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.
    • Easy Installation: Half round head bolts can be installed with just an appropriately sized pliers, without the need for special installation tools.
    • High Strength: Compared with ordinary bolts of the same specification, half round head bolts have higher strength and can withstand larger loads.
    Drawbacks & Limitations
    • 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.
    • Thread 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 main purpose of a carriage bolt?

    Carriage bolts are primarily used to connect two objects together, typically through pre-drilled light holes, and must be used in combination with matching nuts to secure the connection.

    How does a carriage bolt prevent rotation during installation?

    During installation, the square neck of the carriage bolt fits securely into a pre-designed groove. This square neck locks into place, preventing the bolt from rotating while it is being tightened.

    What are the primary applications of semi-circular head bolts?

    They are commonly used for hinged connections across three main scenarios: connecting moving parts in mechanical equipment (like shafts and swing arms), securing structural components requiring flexibility (like wall panels and doors/windows), and linking parts within transmission systems.

    What tool is needed to install semi-circular head bolts?

    Unlike bolts that require highly specialized driving tools, semi-circular head bolts are easy to install using just an appropriately sized pair of pliers.

    Why are semi-circular head bolts considered difficult to disassemble?

    Because the head is round and lacks built-in slots (like a cross groove or internal hexagon), standard screwdrivers or Allen keys cannot be used. This makes disassembly difficult without special tools and techniques, which also helps prevent theft.