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DIN 933 Hexagonal Bolt A2-70 - China Suppliers & Factory Direct Quality Grades 4.8 to 12.9 Available
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DIN 933 Hexagonal Bolt A2-70 - China Suppliers & Factory Direct Quality Grades 4.8 to 12.9 Available

Discover high-quality fully threaded hexagonal bolts in compliance with the DIN 933 standard, available in grades A and B. Our bolts feature thread diameters ranging from M1.6 to M52 and are manufactured in various materials such as Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, and 42Crmo. Choose from a variety of surface treatments, including blackened, electrogalvanized, Dacromet, hot-dip galvanized, and standard galvanized options.

For Grade A products, the specifications include a thread diameter (d) of up to 24mm with lengths (l) that adhere to the limits of 10d or 150mm (whichever is smaller). Grade B products accommodate larger dimensions, featuring a diameter exceeding 24mm or lengths beyond 10d or 150mm (whichever is smaller). We ensure precise manufacturing standards that cater to the specific values for opposite edges (s), diagonal (e), thickness (k), and length tolerances.

As a leading factory and supplier from China, we pride ourselves on delivering exceptional products that meet international standards. Enhance your projects with our durable and reliable hexagonal bolts today!

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    Product Detail

    Product introduction

    introduction
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    The general thread diameter specification of DIN 933 bolts is M3-M64, and the common carbon steel performance grades are mainly 8.8 and 10.9. When d ≤ 39mm, stainless steel is usually A2-50/A2-70/A4-70/A4-80, which can refer to ISO 3506-1 or DIN 267-11.

    The bolts of this standard are generally in metric (coarse thread) and fine thread, measured in millimeters (mm). The tolerance for DIN 933 coarse thread is 6g. Common coatings on the market include black coating, electroplating (blue white zinc, yellow colored zinc), and non electrolytic zinc powder coating (GEO). The tolerance fit before coating is mainly 6g/6H, and the tolerance band fit after galvanizing can be changed to 6h/6G. However, due to the influence of surface coating thickness after coating, when testing threads with corresponding tolerance gauges, there may be situations where they cannot fit. At this time, nut installation testing with matching specifications can be carried out.

    DIN 933 bolt is a fully threaded hexagonal head bolt with a wide range of applications, commonly found in the following fields:
    1. Mechanical manufacturing: Used for the assembly and fixation of mechanical equipment, connecting various mechanical components.
    2. Construction engineering: Such as fixing steel structures, installing brackets, connectors, etc.
    3. Automotive industry: Can be used for fastening parts such as the engine, chassis, and body of automobiles.
    4. Electronic devices: They play a role in connecting and fixing in the assembly of some electronic devices.
    5. Petrochemical industry: Suitable for the connection of chemical equipment, pipelines, etc. Some DIN 933 bolts can meet the anti-corrosion requirements of the chemical environment.
    6. Shipbuilding industry: Used for ship construction and equipment installation.
    7. Aerospace: Used in areas with high requirements for strength and reliability.
    8. Energy field: Including the installation and fixation of equipment such as wind power generation and solar energy.
    9. Manufacturing of pumps and valves: As connectors for pump shafts and valve stems.
    10. Industrial equipment: Assembly of various general industrial equipment.
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    Frequently Asked Questions (FAQ)

    Q1: What is the general thread diameter range for DIN 933 bolts?

    A1: The general thread diameter specification for DIN 933 bolts ranges from M3 to M64.

    Q2: What are the common performance grades available for DIN 933 bolts?

    A2: For carbon steel, the common performance grades are mainly 8.8 and 10.9. For stainless steel (when d ≤ 39mm), the common grades are typically A2-50, A2-70, A4-70, and A4-80, referring to standards like ISO 3506-1 or DIN 267-11.

    Q3: What types of surface coatings can be applied to DIN 933 bolts?

    A3: Common coatings available on the market include black coating, electroplating (blue white zinc, yellow colored zinc), and non-electrolytic zinc powder coating (GEO).

    Q4: Why might standard tolerance gauges fail to fit DIN 933 bolts after coating?

    A4: The thickness of the surface coating can affect the thread size. While the tolerance fit before coating is 6g/6H, it may change to 6h/6G after galvanizing. If standard gauges do not fit, you can perform a nut installation test with matching specifications instead.

    Q5: What are the primary fields of application for DIN 933 fully threaded bolts?

    A5: DIN 933 bolts are widely used in mechanical manufacturing, construction engineering, the automotive industry, electronic devices, petrochemicals, shipbuilding, aerospace, energy fields, and pump/valve manufacturing.