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Electrogalvanized expansion bolts
It consists of countersunk bolts, expansion tubes, flat washers, spring washers and hexagonal nuts. The material is mostly carbon steel (such as Q235), and the thickness of the electrogalvanized layer is 5-12μm, which meets ISO 1461 or GB/T 13912-2002 standards.
Description
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Product Introduction
Structure: It consists of countersunk bolts, expansion tubes, flat washers, spring washers and hexagonal nuts. The material is mostly carbon steel (such as Q235), and the thickness of the electrogalvanized layer is 5-12μm, which meets ISO 1461 or GB/T 13912-2002 standards.
Bearing capacity: The bearing capacity of different specifications varies significantly. For example, the maximum static force of M6-M12 expansion bolts in concrete is 120-510 kg respectively. The appropriate specifications need to be selected according to the actual load.
Application: Suitable for building structures, mechanical installation and other fields, such as fixing curtain walls, doors and windows, mechanical equipment bases, etc., especially suitable for indoor or dry environments.
Surface treatment comparison and selection suggestions
| Treatment process | Color | Thickness range | Salt spray test | Corrosion resistance | Wear resistance | Main application scenarios |
| Electrogalvanizing | Silvery white / blue-white | 5-12μm | 24-48 hours | General | Medium | Indoor dry environment, ordinary mechanical connection |
| Colored zinc plating | Rainbow color | 8-15μm | More than 72 hours | Good | Medium | Outdoor, humid or mildly corrosive environment |
| Black zinc plating | Black | 10-15μm | More than 96 hours | Excellent | Good | High temperature, high humidity or decorative scenes |
Selection suggestions:
Environmental factors: Colored zinc plating or black zinc plating is preferred in humid or industrial environments; electrogalvanizing can be selected in dry indoor environments.
Load requirements: For high-load scenarios, it is necessary to select expansion bolts of appropriate grades (such as 8.8 or above) according to the specification table, and pay attention to the impact of the galvanizing process on mechanical properties (such as hot-dip galvanizing may cause a decrease in tensile strength of about 5-10%).
Environmental requirements: Colored zinc plating and black zinc plating may contain hexavalent chromium and must comply with environmental directives such as RoHS; cold galvanizing (electrogalvanizing) has better environmental performance and does not contain heavy metals.
Appearance requirements: Colored zinc plating or black zinc plating is preferred for decorative scenes, and electrogalvanizing can be selected for general industrial use.
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