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China DIN 603 Refined Carriage Bolts Suppliers - Grade 4.8 to 12.9, Various Materials and Surface Treatments from Factory
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China DIN 603 Refined Carriage Bolts Suppliers - Grade 4.8 to 12.9, Various Materials and Surface Treatments from Factory

Discover high-quality carriage bolts from a leading China supplier and factory, available in grades 4.8, 8.8, 10.9, and 12.9. Our carriage bolts are made from premium materials such as Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, and 42Crmo to ensure durability and strength. Choose from a variety of surface treatments, including blackened, electrogalvanized, Dacromet, hot-dip galvanized, and standard galvanized finishes to meet your specific needs.

Our product range includes both large and small half round head carriage bolts, complying with GB/T14, DIN603, and GB/T12-85 standards. Designed to connect two parts with through holes securely, these fasteners consist of a robust head and a cylindrical body with external threads, ensuring a reliable fit when paired with a nut. As a trusted China supplier and factory, we are committed to delivering exceptional fasteners that meet the highest industry standards.

    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.

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

    OUR AdvantagesAdvantages

    Key Advantages
    • 1. Hinged connection capability 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 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 High strength. Compared with ordinary bolts of the same specification, half round head bolts have higher strength and can withstand larger loads.
    Drawbacks & Limitations

    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 susceptibility The 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
    What is the primary function of a carriage bolt?
    Carriage bolts are designed to connect two objects together, typically through pre-drilled light holes, and must be used in conjunction with a nut. Their square neck design locks into place within a groove to prevent rotation during installation.
    How do carriage bolts prevent theft?
    Carriage bolts feature a smooth, circular, semi-round head with no external driving design like cross grooves or internal hexagons. Since no standard tools can grip the head from the outside, they act as an effective anti-theft fastening solution.
    Where are semi-circular head bolts commonly used?
    They are widely used in applications requiring hinged connections, including mechanical equipment (shafts and swing arms), structural systems (wall panels, ceilings, doors, and windows), and transmission connections.
    Do I need special tools to install half round head bolts?
    No, one of their primary advantages is easy installation. They can be installed using appropriately sized pliers, eliminating the need for specialized installation equipment.
    What are the disadvantages of using half round head bolts?
    The main disadvantages include difficulty in disassembly, which requires specific techniques, and a higher susceptibility of the threaded part to damage, potentially limiting their reusability.