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China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications
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China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications
China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications
China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications
China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications
China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications
China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications
China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications
China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications

China Suppliers Factory External Hexagonal Bolt DIN M8-M16, 8.8s Grade, for Reliable Construction Applications

When considering fasteners, external hexagonal bolts offer numerous advantages but come with specific limitations. These bolts are not suitable for thin-walled components or applications exposed to impact, vibration, or alternating loads. Additionally, longer variants may not feature full threads, which can make it challenging to find compatible tightening tools. They are also susceptible to stripping and require careful replacement. For proper disassembly, a professional wrench is recommended, as these bolts can be difficult to remove in standard conditions. As a trusted factory and supplier based in China, we provide high-quality external hexagonal bolts designed for various applications while understanding their limitations. Choose us for reliable fasteners that meet your project needs.

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    8rnt
    Thread specifications
    d    		 M10 M12 M14 M16 M18 M20 M22 M24
    P Pitch 1.50 1.75 2.0 2.0 2.5 2.5 2.5 3
    b L≤125 26 30 34 38 42 46 50 54
    125＜L≤200 32 36 40 44 48 52 56 60
    L＞200 / / / 57 61 65 69 73
    ds Max 10 12 14 16 18 20 22 24
    Min 9.64 11.57 13.57 15.57 17.57 19.48 21.48 23.48
    e Min 19.68 22.58 25.94 29.3 32.66 36.96 39.2 44.8
    k Max 6.69 7.79 9.09 10.29 11.85 12.85 14.35 15.35
    Min 6.11 7.21 8.51 9.71 11.15 12.15 13.65 14.65
    s Max 18 21 24 27 30 34 36 41
    Min 17.57 20.16 23.16 26.16 29.16 33 35 40
    1,000 pieces of steel weigh ≈ kg - - - - - - - -
    Thread specifications
    d    		 M27 M30 M33 M36 M39 M42 M45 M48
    P Pitch 3 3 3 3 3 3 3 3
    b L≤125 60 66 72 78 84 90 96 102
    125＜L≤200 66 72 78 84 90 96 102 108
    L＞200 79 85 91 97 103 109 115 121
    ds Max 27 30 33 36 39 42 45 48
    Min 26.48 29.48 32.38 35.38 38.38 41.38 44.38 47.38
    e Min 50.4 54.9 60.3 65.9 71.5 71.5 76.3 81.9
    Min Min 17.35 19.12 21.42 22.92 25.42 26.42 28.42 30.42
    Min Min 16.65 18.28 20.58 22.08 24.58 25.58 27.58 29.58
    s Max 46 50 55 60 65 65 70 75
    Min 45 49 53.8 58.8 63.8 63.8 68.1 73.1
    1,000 pieces of steel weigh ≈ kg - - - - - - - -

    External hexagonal bolts are a common type of mechanical fastener, mainly used for connecting and fixing mechanical equipment.

    External hexagonal bolts are commonly used for:
    • 1
      Connecting componentsThe outer hexagonal bolt fixes multiple components together through the action of torque, forming a whole.
    • 2
      Load bearingDue to its high-strength design, the outer hexagonal bolt can withstand large loads and shear forces, and is not easy to break or loosen, ensuring the firmness of the connection.
    • 3
      Easy installationNo special fixtures or tools are required during installation, it can be completed with a wrench or socket, and the installation speed is fast, which can improve production efficiency.
    • 4
      Wide application rangeExternal hexagonal bolts are suitable for various connection situations, such as heavy machinery, construction, and bridge engineering, and can meet various connection requirements.
    Frequently Asked Questions
    Q What is an external hexagonal bolt?
    An external hexagonal bolt (also known as a hex bolt) is a threaded fastener with a six-sided head, tightened using a wrench or socket tool. It is one of the most widely used fastener types in mechanical and structural engineering, valued for its ease of installation and high clamping strength.
    Q What metric thread sizes are available?
    External hexagonal bolts are available in standard metric sizes from M10 to M48, including M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M39, M42, M45, and M48. Complete dimensional data — including pitch, thread length, and wrench size — are listed in the specification tables above.
    Q What materials are external hexagonal bolts typically made from?
    External hexagonal bolts are most commonly manufactured from carbon steel, alloy steel, or stainless steel. The choice of material depends on load requirements, operating environment, and corrosion resistance needs. High-strength grades are used in heavy machinery and structural applications.
    Q How do I select the correct thread engagement length (b)?
    The thread length (b) depends on the total bolt length (L). Refer to the "b" row in the specification table: bolts with L≤125mm, 125mm＜L≤200mm, and L＞200mm each have different thread length values. Always match the grip length of your application to ensure proper clamping force and thread engagement.
    Q What tools are required to install external hexagonal bolts?
    Only a standard open-end wrench, combination wrench, or socket wrench is needed — matched to the bolt's wrench size (s) as listed in the specification table. No special fixtures are required, making installation straightforward and efficient in both field and factory settings.
    Q In which industries are external hexagonal bolts most commonly used?
    External hexagonal bolts are widely used across heavy machinery manufacturing, automotive assembly, civil construction, bridge engineering, and infrastructure projects. Their high load-bearing capacity, resistance to loosening under vibration, and ease of installation make them a standard choice in demanding connection applications.