DIN 933 Hexagonal Bolt A2-70 | China Suppliers & Factory | Grades 4.8, 8.8, 10.9, 12.9 Available

Discover our high-quality fully threaded hexagonal bolts manufactured according to DIN 933 standards, available in a range of grades including 4.8, 8.8, 10.9, and 12.9. Our products are made from premium materials such as Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, and 42Crmo, ensuring strength and durability for various applications.

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As leading China suppliers and factory of hexagonal bolts, we provide options with surface treatments like Blackened, Electrogalvanized, Dacromet, Hot-dip Galvanized, and Galvanized. Our bolts feature thread diameters from M1.6 to M52, accommodating both Class A and B specifications. Class A regulations apply to bolts where the diameter (d) is less than or equal to 24mm and length (l) is less than or equal to 10d or 150mm, whichever is smaller. Class B regulations apply to larger dimensions.

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With precise measurements for opposite edges (s), diagonal (e), thickness (k), and length tolerance, our hexagonal bolts are designed to meet and exceed industry standards. Choose our China factory for reliable and high-performance fasteners that fit your needs perfectly.

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PRODUCTS DETAILS

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)

What are the common thread specifications and grades for DIN 933 bolts?
The general thread diameter specification of DIN 933 bolts is M3-M64. Common carbon steel performance grades are mainly 8.8 and 10.9. For stainless steel (when d ≤ 39mm), the common grades are A2-50, A2-70, A4-70, and A4-80.
What surface coatings are available for DIN 933 bolts?
Common coatings available on the market include black coating, electroplating (blue white zinc, yellow colored zinc), and non-electrolytic zinc powder coating (GEO).
What is the typical thread tolerance fit for these bolts?
The tolerance for DIN 933 coarse thread is 6g. The tolerance fit before coating is mainly 6g/6H, and the tolerance band fit after galvanizing can be changed to 6h/6G.
What should I do if a thread gauge does not fit after coating?
Due to the thickness of the surface coating, thread gauges might occasionally fail to fit. In such cases, you can conduct nut installation testing using matching specifications.
What are the primary application fields for DIN 933 bolts?
DIN 933 bolts are fully threaded hexagonal head bolts widely used in mechanical manufacturing, construction engineering, automotive industry, electronic devices, petrochemical industry, shipbuilding, aerospace, energy fields, pump and valve manufacturing, and general industrial equipment assembly.

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