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China Suppliers Factory for Galvanized and Blackened Double-Headed Bolts Grade 4.8 and 8.8 – Reliable Connection Solutions
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China Suppliers Factory for Galvanized and Blackened Double-Headed Bolts Grade 4.8 and 8.8 – Reliable Connection Solutions
China Suppliers Factory for Galvanized and Blackened Double-Headed Bolts Grade 4.8 and 8.8 – Reliable Connection Solutions
China Suppliers Factory for Galvanized and Blackened Double-Headed Bolts Grade 4.8 and 8.8 – Reliable Connection Solutions
China Suppliers Factory for Galvanized and Blackened Double-Headed Bolts Grade 4.8 and 8.8 – Reliable Connection Solutions
China Suppliers Factory for Galvanized and Blackened Double-Headed Bolts Grade 4.8 and 8.8 – Reliable Connection Solutions
China Suppliers Factory for Galvanized and Blackened Double-Headed Bolts Grade 4.8 and 8.8 – Reliable Connection Solutions

China Suppliers Factory for Galvanized and Blackened Double-Headed Bolts Grade 4.8 and 8.8 – Reliable Connection Solutions

Double-headed bolts are designed with longevity in mind, addressing potential thread wear or damage that can occur from frequent disassembly. This innovative design ensures that the reliability and stability of the connection are maintained over time. To further enhance the integrity of these threaded connections, anti-loosening measures are implemented to prevent them from loosening under external loads. As a leading supplier in China, we pride ourselves on manufacturing high-quality double-headed bolts in our factory, ensuring that our products meet rigorous industry standards for durability and performance
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    Product Detail

    Double head bolt shz2
    Thread size
    d    		 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33
    designation① D D D D D D D D D D D D D
    / / D-HDZ D-HDZ D-HDZ D-HDZ D-HDZ D-HDZ D-HDZ D-HDZ D-HDZ D-HDZ D-HDZ
    ds Max 5.32 7.16 8.99 10.83 12.66 14.66 16.33 18.33 20.33 22 25 27.67 30.67
    Min 5.14 6.97 8.78 10.59 12.41 14.41 16.07 18.07 20.07 21.69 24.69 27.34 30.34
    S Public 50 63 75 100 115 125 140 150 165 175 200 200 225
    Max 75 88 100 125 140 150 165 175 190 200 225 225 250
    Min 42 55 67 92 107 117 132 142 157 167 192 192 217
    Connecting nut M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33
    ⚙ The function of double headed bolts:
    1
    Connecting Mechanical Components

    Double headed bolts have threads at both ends and a screw in the middle, commonly used to connect mechanical components such as mining machinery, bridges, automobiles, motorcycles, boiler steel structures, suspension towers, large-span steel structures, and large buildings.

    2
    Installation Accessories

    When large equipment requires the installation of accessories, such as observation mirrors, mechanical seal seats, reduction frames, etc., double headed bolts can play a role. One end is screwed into the main body, and after installing the accessories, the other end is equipped with a nut. Due to the fact that these attachments may require frequent disassembly, using double headed bolts for replacement would be very convenient.

    3
    Connecting Thick Plates & Restricted Areas

    In cases where the thickness of the connectors is large or the connection area is not convenient to use hexagonal bolts, such as concrete roof trusses, roof beam suspensions, monorail beam suspensions, etc., double headed bolts are also a suitable choice.

    4
    Fixed Connecting Rod

    Double headed bolts are also commonly used for mechanical fixed connecting rods, with corresponding threads at both ends. The thickness of the middle screw varies depending on actual usage.

    ? Frequently Asked Questions
    Q What is a double headed bolt and how does it work?
    A double headed bolt (also known as a stud bolt) is a fastener featuring threads at both ends with a smooth or threaded shank in the middle. One end is permanently screwed into a tapped hole in the base component, while the other end accepts a nut to secure the mating part. This design allows the joint to be assembled and disassembled repeatedly without affecting the base connection.
    Q What thread sizes are available for double headed bolts?
    Double headed bolts are manufactured in a comprehensive range of metric thread sizes: M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, and M33. Each size corresponds to specific shaft diameter tolerances and overall length ranges (S values) as listed in the specification table above.
    Q What is the difference between the "D" and "D-HDZ" designation?
    The "D" designation refers to the standard double headed bolt in its base finish. "D-HDZ" indicates a hot-dip galvanized version, which provides a thick zinc coating for superior corrosion resistance. The D-HDZ designation is available for sizes M10 and above, making it the preferred choice for outdoor, marine, or chemically aggressive environments.
    Q Why choose a double headed bolt over a standard hexagonal bolt?
    Double headed bolts are the preferred solution when the connected material is too thick for a standard hex bolt to pass through, when the space around the joint prevents fitting a bolt head, or when one side of the assembly requires frequent removal. The permanently installed end remains secure while the nut side can be tightened and loosened without disturbing the base structure.
    Q In which industries are double headed bolts most commonly used?
    Double headed bolts serve critical roles across a broad spectrum of industries, including mining and heavy machinery, civil infrastructure (bridges, large buildings, concrete roof trusses), automotive and motorcycle manufacturing, boiler and pressure vessel fabrication, steel structure and suspension tower construction, and large-span structural engineering projects.
    Q How do I select the correct connecting nut for a double headed bolt?
    The connecting nut must match the thread size of the double headed bolt exactly — for example, an M16 bolt requires an M16 nut with the same thread pitch. Always cross-reference the specification table to confirm the shaft diameter (ds) and overall length (S) suit your application, and ensure the nut grade and surface finish are compatible with the operating environment.