China Suppliers DIN 933 A2-70 Hexagonal Bolt Factory - Grade 4.8 to 12.9, Various Materials and Surface Treatments

Discover high-quality hexagonal bolts at our China factory, offering various grades including 4.8, 8.8, 10.9, and 12.9. Our bolts are made from premium materials such as Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, and 42Crmo. With surface treatments available like blackened, electrogalvanized, Dacromet, hot-dip galvanized, and standard galvanization, we ensure durability and corrosion resistance.

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Our DIN 933 standard fully threaded hexagonal bolts range from a thread diameter of M1.6 to M52, classified into product grades A and B. Grade A specifications include diameters (d) up to 24mm and lengths (l) not exceeding 10d or 150mm (whichever is smaller). For Grade B, the specifications cover diameters greater than 24mm or lengths exceeding 10d or 150mm (whichever is smaller). Each grade comes with specific values for opposite edges, diagonal measurements, thickness, and length tolerances.

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As a leading supplier in China, we take pride in our factory's capability to meet your bolting needs with precision and reliability. Choose us for your hexagonal bolt requirements and experience unparalleled quality!

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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 is the general thread diameter specification of DIN 933 bolts?
The general thread diameter specification of DIN 933 bolts is M3-M64.
What are the common performance grades for carbon steel and stainless steel DIN 933 bolts?
For carbon steel, the common performance grades are mainly 8.8 and 10.9. When the diameter is d ≤ 39mm, stainless steel is usually A2-50, A2-70, A4-70, or A4-80 (referring to ISO 3506-1 or DIN 267-11 standards).
What types of surface coatings are commonly used 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 are the thread tolerance fits before and after coating?
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 adjusted to 6h/6G.
What should I do if the thread tolerance gauge does not fit after coating?
Due to the thickness of the surface coating, threads may sometimes fail to fit their corresponding tolerance gauges. In these situations, you can perform nut installation testing using matching specifications.
What are the primary fields of application for DIN 933 bolts?
They are widely used in mechanical manufacturing, construction engineering, the automotive industry, electronic devices, the petrochemical industry, shipbuilding, aerospace, energy fields, pump and valve manufacturing, and general industrial equipment assembly.

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