China DIN 933 Hexagonal Bolts A2-70 - Factory Suppliers for Grade 4.8, 8.8, 10.9, 12.9 Options
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.
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)
QWhat is the general thread diameter range for DIN 933 bolts?
The general thread diameter specification for DIN 933 bolts is M3-M64.
QWhat are the common carbon steel performance grades for these bolts?
The common carbon steel performance grades for DIN 933 bolts are mainly 8.8 and 10.9.
QWhat stainless steel grades are used when the bolt diameter is 39mm or less?
When d ≤ 39mm, stainless steel grades A2-50, A2-70, A4-70, and A4-80 are typically used, referencing standard ISO 3506-1 or DIN 267-11.
QWhat surface coatings are commonly available for DIN 933 bolts?
Common coatings on the market include black coating, electroplating (blue white zinc, yellow colored zinc), and non-electrolytic zinc powder coating (GEO).
QHow does galvanizing affect the tolerance fit of the threads?
The tolerance fit before coating is mainly 6g/6H, which can change to 6h/6G after galvanizing. Due to the coating thickness, standard tolerance gauges might not fit initially, so nut installation testing with matching specifications can be carried out to verify the fit.