DIN 933 304 A2-70 Hexagonal Bolts - China Suppliers & Factory for Various Grades and Coatings
Product introductionintroduction
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.
Applications of DIN 933 Bolts
DIN 933 bolt is a fully threaded hexagonal head bolt with a wide range of applications, commonly found in the following fields:
Mechanical manufacturing: Used for the assembly and fixation of mechanical equipment, connecting various mechanical components.
Construction engineering: Such as fixing steel structures, installing brackets, connectors, etc.
Automotive industry: Can be used for fastening parts such as the engine, chassis, and body of automobiles.
Electronic devices: They play a role in connecting and fixing in the assembly of some electronic devices.
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.
Shipbuilding industry: Used for ship construction and equipment installation.
Aerospace: Used in areas with high requirements for strength and reliability.
Energy field: Including the installation and fixation of equipment such as wind power generation and solar energy.
Manufacturing of pumps and valves: As connectors for pump shafts and valve stems.
Industrial equipment: Assembly of various general industrial equipment.
Frequently Asked Questions (FAQ)
What is the standard thread diameter range for DIN 933 bolts?
The general thread diameter specification for DIN 933 bolts ranges from M3 to M64.
What are the common performance grades for DIN 933 carbon steel and stainless steel bolts?
For carbon steel, performance grades are mainly 8.8 and 10.9. For stainless steel (when d ≤ 39mm), the grades are typically A2-50, A2-70, A4-70, and A4-80, referencing ISO 3506-1 or DIN 267-11 standards.
What thread types and tolerances are standard for DIN 933 bolts?
They are generally available in metric (coarse thread) and fine thread, measured in millimeters (mm). The standard tolerance for DIN 933 coarse thread is 6g.
What surface coatings are available for DIN 933 bolts?
Common surface treatments include black coating, electroplating (blue white zinc and yellow colored zinc), and non-electrolytic zinc powder coating (GEO).
How does coating affect the thread tolerance and fit of DIN 933 bolts?
The tolerance fit before coating is mainly 6g/6H, which can change to 6h/6G after galvanizing. If the thickness of the coating prevents the bolt from fitting corresponding tolerance gauges, thread fit can be verified by conducting a nut installation test with matching specifications.
In which industries are DIN 933 fully threaded hex bolts typically used?
DIN 933 bolts are widely used in mechanical manufacturing, construction engineering, the automotive industry, electronic devices, petrochemicals, shipbuilding, aerospace, energy fields (wind and solar), pump and valve manufacturing, and general industrial equipment assembly.