Black Oxide Anti corrostion Metric Hex Bolt Carbon steel Hot Dip GRADE 8.8 10.9 Black color

Black Oxide Anti corrostion Metric Hex Bolt Carbon steel Hot Dip GRADE 8.8 10.9Black color

1,Description:

Hexagonal bolts have the following significant advantages over other fasteners:

1. Superior mechanical properties• High torque transmission efficiency: The hexagonal design provides a large contact surface between the wrench and the bolt head, making it less likely to slip and enabling it to withstand a greater tightening torque
• Strong load-bearing capacity: The head is not prone to deformation or stripped (slippage), making it suitable for high-load connections
• Uniform force distribution: The hexagonal structure ensures a more balanced stress distribution, reducing local fatigue damage

2. Good ease of operation• Strong tool versatility: Standard hex wrenches, socket wrenches, and ratchet wrenches can all be operated, and the tools are readily available
• Multi-directional operation: It can be disassembled and assembled from multiple angles on the side (one every 60°), with good spatial adaptability
• Fast and efficient: When combined with electric/pneumatic tools, it can achieve rapid batch assembly, enhancing production efficiency

3. Standardization and interchangeability• Unified international standards: Adhering to standards such as ISO, DIN, and GB, the specifications are globally universal, and procurement and replacement are convenient
• Complete range of specifications: Parameters such as diameter, length, and pitch are serialized and complete, meeting the requirements of various working conditions

Blackening treatment is a metal surface treatment process that forms a film of iron (III) oxide on the metal surface to achieve the purpose of rust prevention and aesthetic appearance.

The principle of blackening treatment

The basic principle of blackening treatment is to form an oxide film on the metal surface through chemical reactions, mainly composed of iron (III) oxide (Fe3O4). This film can isolate air, thereby preventing the metal from oxidizing and rusting. Blackening treatment is usually carried out at low temperatures. The black film formed not only has a certain anti-rust ability but also can eliminate the reflection on the metal surface and enhance the appearance.

1,Pretreatment: Clean the metal surface to remove oil stains and rust.

2. Pickling: Use acid solution to remove surface oxides when necessary.

3. Blackening treatment: Immerse the metal part in a solution containing sodium hydroxide and an oxidant, heat it to a certain temperature, and cause an oxidation reaction on the metal surface to form a film of iron (III) oxide.

4. Post-treatment: Usually, anti-rust oil is applied to the treated metal parts to enhance the anti-rust effect.

2,Applications:

Machinery Manufacturing: Equipment assembly, base mounting
Construction Engineering: Steel structure connections, bridge construction
Automotive Industry: Engine and chassis assembly
Electronics and Electrical: Enclosures, equipment housings
Furniture Manufacturing: Metal frame structures
Pipe Installation: Flange connections

 

Packaging Options

Available in small packing, carton packing, or pallet configurations to meet your shipping and storage requirements.

Manufacturer Information

Manufactured by JIA SHAN Hardware Company with strict quality control measures and pre-shipment inspection.